MIDNITE SOLAR MN3024DIY Hybrid Inverter Charger User Manual
- September 30, 2024
- MiDNiTE SOLAR
Table of Contents
MN3024DIY Hybrid Inverter Charger
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Product Information
Specifications:
- Model: MN3024DIY
- Type: Hybrid Inverter / Charger
- AC Output: 120 volts
- Features: Built-in MPPT PV Charge Controller
Product Usage Instructions:
1. General Information
1.1 Product Overview and Features:
The MN3024DIY is an all-in-one solution for 120-volt AC
production, battery charging from the AC input, and comes with a
built-in MPPT PV Charge Controller.
1.2 Basic System Introduction:
The system provides a comprehensive solution for power
production, battery charging, and solar panel charge control.
1.3 Appearance:
The hybrid inverter has a sleek and compact design, suitable for
both residential and commercial installations.
2. Installation Instructions
2.1 Installation Precautions:
Before installation, ensure to read all safety instructions
provided in the manual and follow the recommended precautions.
2.2 Wiring Specifications and Circuit Breaker Selection:
Refer to the manual for detailed wiring specifications and
guidelines for selecting appropriate circuit breakers for safe
operation.
2.3 Installation and Wiring:
Follow the step-by-step instructions in the manual to correctly
install and wire the hybrid inverter for optimal performance.
3. Operating Modes
3.1 Charging Mode:
Learn how to activate and utilize the charging mode to
efficiently charge the connected batteries from the AC input.
3.2 Output Mode:
Understand how to switch to the output mode for using the
generated AC power for various electrical appliances.
FAQ (Frequently Asked Questions)
Q: What should I do if the fault code appears on the
display?
A: Refer to section 6.2 in the manual to understand the meaning
of different fault codes and follow the troubleshooting steps
provided.
Q: Can I connect multiple battery types to the hybrid
inverter?
A: The manual (section 4.3) provides guidance on setting up
parameters for different battery types. Follow the instructions
carefully for safe operation.
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MN3024DIY User Manual
Hybrid Inverter / Charger User Manual
MN3024DIY
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Important safety instructions
Please keep this manual for future use. The MNS Hybrid Inverter System is an
all-in-one solution for 120 volt AC production, battery charging from the AC
input and a built-in MPPT PV Charge Controller
This manual contains all safety, installation and operating instructions for
the MNS Hybrid Inverter.
Please read all instructions and precautions in the manual carefully before
installation and use. ØHigh voltages exist inside the MNS Hybrid Inverter. To
avoid personal injury, users shall not disassemble the MNS Hybrid Inverter
themselves. Contact our Midnite Solar technical support department if the unit
is a need for repair. ØDo not install the MNS Hybrid Inverter in harsh
environments such as moist, oily, flammable, explosive, or heavily dusty
areas. The unit is not rain-proof, do not install outside unless under cover
where it will not be exposed to rain. ØThe mains input and AC output are high
AC voltage, do not touch the wiring terminals. ØThe housing of the MNS Hybrid
Inverter is hot when it is operating especially under full load. The exposed
heatsink may be very hot, do not touch. ØDo not open the terminal protective
cover when the MNS Hybrid Inverter is operating. ØIt is necessary to install a
proper external circuit breaker on the 120V AC in and PV in connections. The
unit has an internal circuit breaker on the 120V AC in but an external circuit
breaker is required in addition. ØAlways turn off all combiners and AC circuit
breakers of the PV array, AC mains & battery before installing and/or
adjusting the wiring of the MNS Hybrid Inverter. ØAfter installation, check
that all wire connections are tight to avoid terminal heating due to poor and
a loose connection, which is dangerous and may cause fires. ØThe MNS Hybrid
Inverter is for off-grid only. DO NOT Connect the AC OUTPUT to any source of
AC including GRID and GENERATOR.
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CONTENTS
1. GENERAL INFORMATI ON……………………………………………………………………………………………..4
1.1 PRODUCT OVERVIEW AND FEATURES……………………………………………………………………………………… 4 1.2 BASIC
SYSTEM INTRODUCTION…………………………………………………………………………………………….. 5 1.3
APPEARANCE…………………………………………………………………………………………………………………6
2. INSTALLATION INST RUCTIONS…………………………………………………………………………………….7
2.1 INSTALLATION PRECAUTIONS ……………………………………………………………………………………………… 7 2.2 WIRING
SPECIFICATIONSAND CIRCUIT BREAKER SELECTION…………………………………………………………… 8 2.3
INSTALLATION AND WIRING………………………………………………………………………………………………. 11
3. OPERATING MODES …………………………………………………………………………………………………..17
3.1 CHARGING MODE …………………………………………………………………………………………………………. 17 3.2 OUTPUT MODE
…………………………………………………………………………………………………………….. 18
4. LCD SCREEN OPERATING INSTRUCTIONS …………………………………………………………………..19
4.1 OPERATION AND DISPLAY PANEL ……………………………………………………………………………………….. 19 4.2
SETUP PARAMETERS DESCRIPTION ………………………………………………………………………………………22 4.3 BATTERY
TYPE PARAMETERS……………………………………………………………………………………………… 28
5. OTHER FUNCTIONS …………………………………………………………………………………………………..29
5.1 DRY NODE …………………………………………………………………………………………………………………..30 5.2 USB
COMMUNICATION PORT……………………………………………………………………………………………. 30
6. PROTECTION ……………………………………………………………………………………………………………31
6.1 PROTECTIONS PROVIDED…………………………………………………………………………………………………. 31 6.2 FAULT
CODE MEANING ……………………………………………………………………………………………………. 33 6.3 TROUBLESHOOTING
…………………………. ………………………………………………………………………….. 34
7. SYSTEM MAINTENANCE…………………………………………………………………………………………….35
8. TECHNICAL PARAMETERS …………………………………………………………………………………………..36 9. WARRANTY
………………… …………………………………………………………………………………………..39
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1. General information
1.1 Product overview and features
DIY series is a new a-ll-in- -one hybrid solar charger/ inverter, which
integrates battery MPPT solar & AC input charging with sine wave output.
Thanks to DSP control and advanced control algorithm, it has fast response
speed, high reliability and high industrial standards.
Four charging modes are available, i.e. Only Solar, Mains Priority, Solar
Priority and Mains & Solar hybrid charging; and two output modes are
available, i.e. Inverter and Mains, to meet different application
requirements.
The solar charging module applies the latest optimized MPPT technology to
quickly track the maximum power point of the PV array in any environment and
obtain the maximum energy of the solar panel in real time.
Through a state of the art control algorithm, the AC-DC charging module
realizes fully digital voltage and current double closed loop control, with
high control precision in a small volume. Wide AC voltage input range and
complete input/output protections are designed for stable and reliable battery
charging and protection.
Based on full-digital intelligent design, the DC-AC inverter module employs
advanced SPWM technology and outputs pure sine wave to convert DC into AC. It
is ideal for AC loads such as household appliances, power tools, industrial
equipment, and electronic audio and video equipment. The product comes with a
segment LCD display design which allows real-time display of the operating
data and status of the system. Comprehensive electronic protections keep the
entire system safer and more stable.
Features:
1. Full digital voltage and current double closed loop control, advanced SPWM
technology,
pure sine wave output.
2. Two output modes: mains bypass and inverter output; uninterrupted power
supply. 3. Available in 4 charging modes: Only Solar, Mains Priority, Solar
Priority and Mains &
Solar hybrid charging.
4. Advanced MPPT technology with an efficiency of 99%. 5. Designed with a LCD
screen and 3 LED indicators for dynamic display of system
data and operating status.
6. ON/OFF rocker switch for AC output control. 7. Power saving mode available
to reduce no-load loss. 8. Intelligent variable speed fan to efficiently
dissipate heat and extend system life. 9. Battery charging using PV solar or
AC input, supporting use of lead-acid and lithium
battery technologies.
10. 360 ° all-round protection with a number of protection functions. 11.
Complete protections, including short circuit protection, over voltage and
under
voltage protection, overload protection, reverse protection, etc.
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1.2 Basic system introduction
The figure below shows the system application scenario of this product. A
complete system consists of the following parts:
1. PV module: Converts light energy into DC power, and charges the battery
through the onboard MPPT solar charge controller, or to directly drive the
inverter making AC power to drive the loads. (battery-less mode)
2. Mains or generator: Connected at the AC input, to power the loads while
charging the battery. If the mains or generator is not connected, the system
can also operate normally, and the load is powered by the battery and PV
array.
3. Battery: Provided to ensure normal power supply to the system loads when
solar energy is insufficient and the AC Main is not connected.
4. Household load: Allow connection of various household and office loads,
including refrigerators, lamps, TVs, fans and air conditioners.
5. MNS Hybrid Inverter: The energy conversion unit of the whole system.
Specific system wiring method depends on the actual application scenario.
PV Panel
Generator Or
Utility
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Extirnal Battery packs
Home Appliances 5 of 39
1.3 Appearance
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14 13 12
11
10
1
2
8
3456789
AC input port
AC output port
USB communication port
RS485/CAN communication port
Dry contact port
Grounding screw
AC input breaker
Cooling fan
Battery port
ON/OFF rocker switch
11
PV port
12
Tou ch button
13
LED Indicator
14
LCD screen
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2. Installation Instructions
2.1Installation precautions
Be very careful when installing the battery. Wear safety glasses when
installing a lead-acid flooded battery. If you come into contact with the
battery acid, rinse with clean water immediately. Do not place metal objects
near the battery to prevent short-circuit of the battery terminals. Hydrogen
gas may be generated when the battery is charging. Please ensure good
ventilation. When installing the unit, be sure to leave enough space around
the MNS Hybrid Inverter for proper heat dissipation. Do not install the MNS
Hybrid Inverter and lead-acid battery(s) in the same cabinet to avoid
corrosion by sulfuric acid gas generated during battery operation. Only
batteries that meet the requirements of the MNS Hybrid Inverter can be
charged. Poorly connected connections and corroded wires may cause terminal
heating which could melt the wire insulation, burn the surrounding materials,
and even cause fires. So, make sure the terminals have been tightened, and the
wires are secured with ties to avoid loose connections caused by shaking of
wires during mobile applications. Avoid mounting in direct sunlight and where
rainwater may get inside if mounting outside.. Even after the power is turned
off, there is still high voltage inside the unit. Do not open or touch the
internal components, and avoid related operations until the capacitor
completely discharges. Do not install the MNS Hybrid Inverter in harsh
environments such as moist, oily, flammable or explosive, or heavily dusty
areas. Do NOT reverse polarity at the battery input terminals, otherwise it
may damage the device and/or cause a fire. The mains AC input and AC output
are high voltage, so please do not touch the wiring terminals. Keep fingers
and tools away from the fan, do not touch it to prevent injury.
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2.2 Wiring specifications and circuit breaker selection
Wiring and installation must comply with national and local electrical codes.
Recommended PV array wiring specifications and circuit breaker selection:
Since the output current of the PV array is affected by the type, connection
method and illumination angle of the PV module, the minimum wire diameter of
the PV array is calculated according to its short-circuit current; refer to
the short -circuit current value in the PV module specification (the short-
circuit current is constant when the PV modules are connected in series; the
short -circuit current is the sum of the short-circuit currents of all PV
modules connected in parallel); the short – circuit current of the PV array
shall not exceed the maximum input current.
Refer to the table below for PV input wire diameter and switch:
Models MN3024DIY
Recommended PV wire size
8 AWG
Maximum PV
Recommended circuit breaker model number
40A
MNEDC40 or MNEPV40
Note: The series string voltage shall not exceed the maximum PV input open circuit voltage.
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Refer to the table below for recommended AC input wire diameter and switch:
Model
MN3024DIY
Recommended AC Input Wiring Diameter
Maximum bypass input current
8 AWG
40A
Recommended circuit breaker type
MNEAC40
Recommended battery input wire diameter and switch selection
Model
Recommended battery wiring diameter
Rated battery discharge current
Maximum charge current
Recommended circuit breaker type
MN3024DIY
2 AWG
125A
100A
MNEDC125
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MNDC125 sold separately ·A convenient clean box for DC breakers. ·Comes with
MNDC125 inverter battery breaker. ·Can also hold up to five dinrail breakers.
·Mounting for shunt ·ETL listed for the USA and Canada ·Bonded
battery/inverter negative tie point ·Equipment ground bus bar ·compliment of
conduit knock outs Dimensions: 17″H x 9″W x 3.5″D
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Recommended AC output wiring specifications and circuit breaker selection
Models MN3024DIY
Recommended AC output wiring
diameter
8mm 2/ 8AWG
Rated inverter AC
output
25A
Maximum bypass output
current
40A
Recommended circuit breaker type
2P–63A
Note: The wire gauge is for reference only. If the distance between the PV array and the MNS Hybrid Inverter or the distance between the MNS Hybrid Inverter and the battery is relatively long, using a bigger gauge wire can reduce the voltage drop to improve system performance.
Note: The above are only recommended wire gauge and circuit breaker. Please select the appropriate wire gauge and circuit breaker according to actual installation requirements. Note: Breakers are there to protect the wire not the electronics. Select wire size for the application, and then select breakers for the wire size. All MidNite Solar breakers are rated for continuous duty.
Recommended wire gauge and breaker size.
MNEPV Breakers are dinrail mount and fit in the MNDC125 enclosure.
Max Current
Wire gauge and breaker size Recommended MidNite Breaker
20 Amps 25 Amps
12 AWG 20 Amp Breaker 10 AWG 30 Amp Breaker
MNEDC20 MNEDC30
MNEPV20 MNEPV30
30 Amps
10 AWG 30 Amp Breaker
MNEDC30
MNEPV30
40 Amps
8 AWG 50 Amp Breaker
MNEDC40
MNEPV40
50 Amps 60 Amps
8 AWG 50 Amp Breaker 6 AWG 60 Amp Breaker
MNEDC50 MNEDC60
MNEPV50 MNEPV60
125 Amps
2 AWG 125 Amp Breaker
MNEDC125
–
MNEPV Breakers are dinrail mount and fit in the MNDC125 enclosure.
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2.1Installation
Installation steps:
and
wiring
Step 1: Determine the installation position and the space for heat dissipation. Determine the
installation position of the MNS Hybrid Inverter, such as wall surface; when installing the MNS
Hybrid Inverter, ensure that there is enough air flowing through the heat sink, and space of at
least 200mm/8 inches to the left and right air outlets of the inverter are open to ensure natural
convection heat dissipation. Refer to the installation diagram of the unit as above.
Warning: Danger of explosion! Never install the MNS Hybrid Inverter and lead-
acid
batteries in the same confined space! Also do not install in a confined place
where battery gas may collect.
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Step 2: Remove the terminal cover
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Step 3: Wiring
AC input / output wiring method:
Prior to AC input/output wiring, disconnect the external circuit breaker and
confirm that the wire used is the appropriate AWG. Please refer to Section 2.2
on pg. 8 “Wiring Specifications and Circuit Breaker Selection”; Properly
connect the AC input wire according to the wire sequence and terminal position
shown in the igure on the next page. Please connect the ground wire irst, and
then the hot wire and then the neutral wire;
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Ground LLive
N Neutral
Properly connect the AC output wire according to the wire sequence and
terminal position shown in the figure below. Please connect the ground wire
first, and then the hot wire and the neutral wire. The ground wire is
connected to the grounding screw hole on the cabinet using a ring terminal or
copper lug.
Ground LLive N Neutral
Note: The grounding wire shall be as large as possible (Not less than 10 AWG). The grounding point shall be as close as possible to the MNS Hybrid Inverter The shorter the grounding wire, the better.
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PV input wiring method:
Prior to wiring, disconnect the external circuit breaker and confirm that the
wire used is appropriate AWG. Please refer to Section 2.2 “Wiring
Specifications and Circuit Breaker Selection”; Properly connect the PV input
wire according to the wire sequence and terminal posi on shown in the figure
below.
PV+: PV input positive pole
PV – : PV input negative pole
BATTERY wiring: Prior to wiring, disconnect the external circuit breaker and
confirm that the wire used is appropriate AWG. Please refer to Section 2.2
“Wiring Specifications and Circuit Breaker Selection”. The BAT wire needs to
be connected to the MNS Hybrid Inverter using a copper ring terminal either
setscrew or crimp type is acceptable. Insure the crimp is tight if using crimp
style to prevent excessive heat generation caused by excessive contact
resistance from a loose terminal;
Properly connect the BAT wire according to the wire sequence and terminal
position shown in the figure on the next page.
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BAT +: Battery positive electrode
BAT – : Battery negative electrode
WarMnainingssi:nput, AC output and PV array are all high voltage. So, before wiring, be sure to disconnect the appropriate circuit breaker. Be very careful during DC wiring; do not close the circuit breaker during wiring, and ensure that the “+” and “-” pole leads of each component are connected properly; a circuit breaker must be installed at the battery input terminals. Refer to Section 2.2 on pg. 9 “Wiring Specifications and Circuit Breaker Selection” to select a correct circuit breaker. Before wiring, be sure to disconnect the circuit breaker to prevent strong electric sparks and avoid battery short circuit; if the MNS Hybrid Inverter is used in an area with frequent lightning, it is recommended to install an external surge suppressors at the PV input terminal as well as the AC input and output. The MNSPD300DC is the correct model for the PV input and the MNSPD300AC for the AC input and output. Both sold separately Step 4: Check if the wiring is correct and tight. In particular, check if the battery polarity is reversed, if the PV input polarity is reversed and if the AC input is properly connected.
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Step 5: Install the terminals cover.
MN3024DIY User Manual
Step 6: Turn on the MNS Hybrid Inverter First, close the circuit breaker at the battery terminal, and then turn the rocker switch on the left side of the machine to the “ON” position. The “AC/INV” indicator flashing indicates that the inverter is working normally. Close the circuit breakers of the PV array and the AC Mains. Finally, turn on AC loads one by one to avoid overcurrent caused by a large momentary load from turning on loads all at once. Now, the unit goes into normal operation. Note: If power is supplied to different AC loads, it is recommended to first turn on the load with a large surge current. After the load is stable, turn on the load with a small surge current. Note: If the MNS Hybrid Inverter does not work properly or the LCD indicator is abnormal, refer to Chapter 6 to handle the error.
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3. Operating modes
3.1 Charging mode
- PV priority: PV module will charge the battery preferentially, and the battery is charged by the Mains only when the PV system fails. During the day, solar energy is fully used to charge, while at night, it renverts to the Mains. This can maintain battery level, and is ideal for areas where the grid is relatively stable and electricity price is relatively high.
- Mains priority: The Mains supply is preferentially used to charge the battery. Only when the Mains are not available, the PV charging will be activated.
- Hybrid charging: PV and mains hybrid charging. PV MPPT charging is a priority, and when PV energy is insufficient, the mains supply supplements. When the PV energy is sufficient again, the main s stop charging. This is the fastest charging mode, suitable for the areas where the power grid is unstable, providing sufficient backup power supply at any time.
- Only Solar (Only Solar): Only PV charging, without Mains charging. This is the most energy efficient way in which the battery is charged, and is usually used in areas with good lighting conditions.
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3.2 Output mode
PV priority mode: Loads are powered by the PV module and battery. Diversified
charging mode and output mode are optional. When PV priority mode is selected,
utilization of green solar energy can be maximized to achieve energy saving
and emission reduction. Switch to mains supply when the PV charging is not
available. This mode maximizes the use of solar energy while maintaining
battery power, suitable for use in the areas with relatively stable grid.
Mains priority mode: Switch to inverter only when the mains are not available
. Then, the unit is equivalent to a backup UPS, suitable for areas with
unstable grid.
Inverter priority mode: Switch to mains supply only when the battery is under
voltage. This mode maximizes the use of DC power and is best suited for areas
with a stable grid.
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4. LCD screen operating instructions
4.1 Operation and display panel
The operation and display panel is as shown below, including 1 LCD screen, 3
indicators and 4 operation buttons.
Operation buttons introduction Function buttons SET UP DOWN ENT
Description
Enter/Exit Settings menu Previous choice Next choice
Confirm /Enter Options under the settings menu,
Indicators introduction Indicators
AC/INV
Colors Yellow
CHARGE FAULT
Green Red
Description Steady on : M ains output
Flash: Inverter output Flash: Battery charging Steady on : Charging completed
Steady on : Fault state
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LCD screen introduction
MN3024DIY User Manual
Icons
Functions Indicates that the AC input terminal has been connected to the grid
Indicates that the AC input mode in APL mode (wide voltage range) Indicates
that the PV input terminal has been connected to the solar panel Indicates
that the machine has been connected to the battery:
indicates that the remaining battery is 0%~24% ;
indicates that the remaining battery is 25%~49% ;
indicates that the remaining battery is 50%~74% ;
indicates that the remaining battery is 75%~100% . Indicates that the battery
type of the machine is a lithium battery
Icons
Functions
Indicates that the inverter circuit is working
Indicates that the machine is in the Mains Bypass mode
Indicates that the AC output is in an overload state
Indicates the percentage of AC output loads:
indicates that the load percentage is 0%~24% ;
indicates that the load percentage is 25%~49%,
indicates that the load percentage is 50%~74%,
indicates that the load percentage is 75%. Indicates that the buzzer is not
enabled
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Indicates that the current battery type of the unit is a lead acid battery
Indicates that the battery is in charging state Indicates that the AC/PV
charging circuit is working
Indicates that the AC output terminal has an AC voltage output
Indicates that the unit has an alarm
Indicates that the unit is in a fault condition Indicates that the unit is in
setup mode
The parameters displayed in the middle of the screen: 1. In the non -setup
mode, the alarm or fault code is displayed. 2. In the set up mode, the
currently set parameter item code is displayed.
Parameters display on the left side of the screen: input parameters
Indicates AC input
Indicates PV input
Indicates inverter circuit
This icon is not displayed
Display battery voltage, battery charge total current, mains charge power, AC input voltage, AC input frequency, PV input voltage, internal heatsink temperature, software version
Parameters display on the right side of the screen: Output parameters
Indicates output voltage, output current, output active power, output apparent power, battery discharge current, software version; in setup mode, displays the set parameters under the currently set parameter item code
Arrow display
The arrow is not displayed
Indicates the grid is supplying power
to the load
Indicatesthe grid supplying power to
the charging circuit
Indicates PV module supplying
power to the charging circuit
Indicates the charging circuit
charging the battery terminal
The arrow is not display ed
Indicates the battery terminal
supplying power to the inverter
circuit
Indicates the inverter circuit
supplying power to the load
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Real -time data viewing method On the LCD main screen, press the ” UP” and ” DOWN ” buttons to scroll through the real-time data of the machine.
Page
Parameters on the left side of the screen
INPUT BATT V 1
(Battery input voltage )
PV TEMP 2
(PV charger heatsink temperature )
PV INPUT V 3
(PV input voltage )
INPUT BATT A 4
(Input battery current )
INPUT BATT KW 5
(Battery input power )
AC INPUT Hz 6
(AC input frequency )
AC INPUT V 7
(AC input voltage )
INPUT V 8
(For m aintain )
INV TEMP
9
(AC charge or battery discharge
heatsink temperature )
10
APP software version
11
M odel PV Voltage Rating
12
Model Battery Voltage Rating
Parameters in the
middle of the screen
Fault code
Parameters on the right side of the screen
OUTPUT LOAD V (Output load voltage )
PV OUTPUT KW (PV output power)
PV OUTPUT A (PV output current ) OUTPUT BATT A (Battery output current) OUTPUT
BATT KW (Battery output power ) AC OUTPUT LOAD Hz (AC output frequency ) AC
OUTPUT LOAD A (AC output load current ) OUTPUT LOAD KVA (Load apparent power)
INV OUTPUT LOAD KW (Load active power )
Bootloader software version Model PV Current Rating
Model Outp ut Power Rating
4.2 Setup parameters description
Buttons operation instructions: Press the “SET” button to enter the setup menu
and exit the setup menu. After entering the setup menu, the parameter number
[00] will flash. At this point, press the “UP” and “DOWN” buttons to select
the code of parameter item to be set. Then, press the “ENT” button to enter
the parameter editing mode, and the value of the parameter is flashing. Adjust
the value of the parameter with the “UP” and “DOWN” buttons. Finally, press
the “ENT” button to complete the parameter editing and return to the parameter
selection state.
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Parameter no. 00 01
02
03
04 05
Parameter name
Exit setting menu
Settings [00] ESC
[01] SOL
Output source priority
[01] UTI default [01] SBU
Output Frequency
[02] 50.0 [02] 60.0
AC Input Voltage Range
[03] APL [03] UPS default
Battery Power to Utility Setpoint
[04] 23.0 default
Utility to Battery Power
Setpoint
[05] 28.0V default
Description
Exit the setup menu
PV priority mode , switching to the Mains when the PV fails or the battery is
lower than the set value of parameter [04]. Mains priority mode, switching to
inverter only when the mains fail . Inverter priority mode, switching to the
mains only when the battery is under voltage or lower than the set value of
parameter [04]. Bypass self – adaptation; when the mains are connected, it
automatically adapts to the mains frequency; when the mains iare disconnected,
the output frequency can be set through this menu. The default output
frequency of the 230V machine is 50HZ, and the 120V machine 60HZ. Wide mains
input voltage range of 230V machine: 90~280V Mains input voltage range of 120V
machine: 90~140V Narrow mains input voltage range of 230V machine: 170~280V
Mains input voltage range of 120V machine: 90~140V When the parameter [01]
=SOL/SBU, the battery voltage is lower than the set value, and the output is
switched from the inverter to the mains. Setting range: 22V~ 26V. When the
parameter [01] =SOL/SBU, the battery voltage is higher than the set value, and
the output is switched from the mains to the inverter. Setting range: 24V~
30V.
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Parameter no. 06
07
08
Parameter name
Charger source priority
Max charger current
Battery Type
Settings [06] CSO [06] CUB
[06] SNU default
[06] OSO [07] 80A default
[08] USE [08] SLd [08] FLd [08] GEL default
[08] LF07/LF08/LF09
Description
PV priority charging ; when not PV is unavailable, charging from the mains is
started.
M ains priority charging; When charging from the mains is not available PV
charging is started.
PV and Mains hybrid charging; PV charging is a priority, and when the PV
energy is insufficient, the Mains charging supplements. When the PV energy is
sufficient, the Mains charging stops. Note: Only when the Mains bypass output
is loaded, the PV charging and the mains charging can work at the same time.
When the inverter is in use, only the PV charging can be started. Only PV
charging, with the Mains charging not activated.
Max charger current (AC charger+PV charger). Setting range: 0~140A
User- defined ; all battery parameters can be set. Sealed lead – acid battery
; absorption charge Voltage: 28.2, float charge voltage: 27.6V
Vented lead- acid battery; absorption charge voltage: 29.2V, float charge
voltage: 27.6V
Colloidal lead- acid battery; absorption charge voltage: 28.4V float charge
voltage: 27.6V
Lithium iron phosphate battery LF 07/LF08/LF09 , corresponding to 7 strings,8
strings and 9 strings of lithium iron phosphate battery; for 7 strings,
default absorption charge voltage is 24.8V; for 8 strings, default absorption
charge voltage is 28.4V; for 9 strings, default absorption charge voltage is
31.8V adjustable
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Parameter no.
Parameter name
Settings [08] NCA
Description
Ternary lithium battery; Default absorption voltage is 28.4V adjustable.
Battery boost
Boost (absorb) charge voltage setting; the setting
[09] 28.8V
09
charge
range is 24~29.2V with a step of 0.2V for
default
voltage
user- defined battery and lithium battery.
Boost (absorb) charge maximum time setting, which
means the maximum charging time to reach
the set voltage of parameter [09] during
Battery boost
10
[10] 120 default constant-voltage charging. The setting range is
charge time
5min~900min, with a step of 5 minutes. It is
valid for user -defined battery and lithium
battery.
Battery
Float charge voltage, setting range:
floating
[11] 27.6V
11
24V~ 229.V, step: 0.2 V, valid when battery type
charge
default
is user – defined.
voltage
Over -discharge voltage ; when the battery
Battery over
voltage drops to the set point, after the delay
discharge
the time set by parameter [13] the inverter will
12
[12] 21V default
voltage (delay
stop inverting. Setting range is20V~ 24V, with
off)
a step of 0.2V. It is valid for user – defined
battery and lithium battery.
Over-discharge delay time; when the battery
voltage is lower than the parameter [12], the
Battery over
inverter output will be turned off after the time
13
discharge
[13] 5S default
set by this parameter is delayed.
delay time
The setting range is 5S~55S, with a step of 5S. It is valid for user-defined battery and
lithium battery.
Battery undervoltage alarm point ; when the
battery voltage is lower than the point, an
Battery under
undervoltage alarm is given , and the output is
14
[14] 22V default
voltage alarm
not turned off; the setting range is 02V~ 26V,
with a step of 0.2V. It is valid for user -defined
battery and lithium battery .
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Parameter no. 15
16 17 18 19 20 21
22
23
Parameter name
Battery discharge limit voltage
Battery equalization
enable
Battery equalization
voltage Battery equalized
time
Battery equalized time out
Battery equalization
interval Battery equalization immediately
Power saving mode
Restart when over load
Settings
[15] 20V default [16] DIS
[16] ENA default [17] 29.2V default
[18] 120 default
[19] 120 default
[20] 30 default [21] DIS
[21] ENA default [22] DIS default
[22] ENA
[23] DIS
Description
Battery discharge limit voltage; when the battery voltage is lower than the
point, the output is turned off immediately ; t he setting range is 20V~ 26V,
with a step of 0.2V. It is valid for user – defined battery and lithium
battery. Equalizing charge is disabled Equalizing charge is enabled, only
valid for vented lead-acid battery and sealed lead- acid battery Equalizing
charge voltage; setting range : 24V~ 29.2V, with a step of 0.2V; valid for
vented lead – acid battery and sealed lead – acid battery Equalizing charge
time ; setting range : 5min~900min, with a step of 5 minutes; valid for vented
lead-acid battery and sealed lead acid battery Equalizing charge delay ;
setting range : 5min~900min, with a step of 5 minutes ; valid for vented lead
– acid battery and sealed lead acid battery Equalizing charge derating time,
0~30days, with a step of 1 day ; valid for vented lead -acid battery and
sealed lead -acid battery Stop equalizing charge immediately.
Start equalizing charge immediately.
Power saving mode disabled . When the power saving mode is enabled, if there
is no load or less than 50W , the inverter output is turned off after a delay
for a certain period of time. When the load is more than 50W, the inverter
automatically restarts. Automatic restart when overload is disabled. If an
overload occurs and the output is turned off, the unit will not restart .
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Parameter no.
24
25 26 27 28 29 35 36
Parameter name
Restart when over
temperature
Alarm enable Beeps while
primary source is interrupted Bypass output when over
load Max AC charger current
Split Phase
Battery undervoltage
recovery point
Max PV charger current
Settings
[23] ENA default
[24] DIS
[24] ENA default [25] DIS
[25] ENA default [26] DIS
[26] ENA default [27] DIS
[27] ENA default [28] 80A default [29] DIS default
[29] ENA [35] 27V default
[36] 60A default
Description
Automatic restart when overload is enabled. If an overload occurs and the
output is turned off, the unit will restart after a delay of 3 minutes . After
it reaches 5 cumulative times, the unit will not restart. Automatic restart
when over temperature is disabled. If an over -temperature shutdown occurs,
the unit will not restart.
Automatic restart when over temperature is enabled. If an over -temperature
shutdown occurs, the unit will restart when the temperature drops. Alarm is
disabled Alarm is enabled Alarm beep is disabled when the status of the main
input source changes Alarm beep is enabled when the status of the main input
source changes Automatic switchover to mains on overload is disabled.
Automatic switchover to mains on overload is enabled.
Max AC charger current. Setting range: 0~ 80A
Supply for industrial frequency transformer (disabled) Supply for industrial
frequency transformer (enabled)
After a low voltage shutdown the unit will restart after the battery voltage
reaches this setpoint.
Max PV charger current. Setting range: 0~ 60A
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4.3 Battery type parameters
For Lead – acid Battery :
Battery type
Parameters Overvoltage disconnection voltage Equalizing charge voltage
Sealed lead acid battery (SLD)
30V 29.2V
Absorption charge voltage
Float charge voltage
28.8V 27.6V
Undervoltage alarm voltage
Low voltage disconnection voltage
Discharge limit voltage
22V 21.2V 21V
Over – di scharge delay time
5s
Equalizing charge duration
120 minutes
Equalizing charge interval
30 days
Absorption charge duration
120 minutes
Colloidal lead acid battery
(GEL)
Vented lead acid battery
(FLD)
User – defined (User)
30V
31V
1830V
28.4V 27.6V 22V 21.2V 21V
5s
–
120 minutes
29.6V
1830V
29.2V
1830V
(Adjustable)
27.6V
1830V
(Adjustable)
22V
1830V
(Adjustable)
21.2V
1830V
(Adjustable)
21V
1830V
(Adjustable)
5s 120 minutes
30 days 120 minutes
130s
(Adjustable)
0600
minutes (Adjustable)
0250 days
(Adjustable)
10600
minutes (Adjustable)
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For Lithium Battery :
Battery type
Parameters Overvoltage disconnection voltage Equalizing charge voltage
Ternary lithium battery (N 06 )
30V
24.6V
(Adjustable)
Absorbtion charge 24.6V
voltage
(Adjustable)
Ternary lithium battery (N 07 )
30V
28.7V
(Adjustable)
28.7V
(Adjustable)
Float charge voltage
24.6V
(Adjustable)
28.7V
(Adjustable)
Undervoltage alarm voltage
Low voltage disconnection voltage
Discharge limit voltage
Over discharge delay time Equalizing charge duration
19.2V
(Adjustable)
18.0V
(Adjustable)
16.8V
30s
(Adjustable)
–
Equalizing
–
charge interval
Absorption charge duration
120
minutes (Adjustable)
22.4V
(Adjustable)
21.0V
(Adjustable)
19.6V
30s
(Adjustable)
–
–
120
minutes (Adjustable)
Lithium iron phosphate battery (LF07)
Lithium iron phosphate battery (LF08)
30V
30V
Lithium iron phosphate battery (LF09)
–
User defined
(User)
33V
1830V
24.6V
(Adjustable)
24.6V
(Adjustable)
24.6V
(Adjustable)
21.6V
(Adjustable)
21V
(Adjustable)
20.4V
30s
(Adjustable)
–
–
120
minutes (Adjustable)
28.4V
(Adjustable)
28.4V
(Adjustable)
28.4V
(Adjustable)
24.8V
(Adjustable)
24.4V
(Adjustable)
24.2V
30s
(Adjustable)
–
–
120
minutes (Adjustable)
31.8V
(Adjustable)
31.8V
(Adjustable)
31.8V
(Adjustable)
27.8V
(Adjustable)
27.4V
(Adjustable)
27.2V
30s
(Adjustable)
–
–
120
minutes (Adjustable)
1830V
1830V
(Adjustable)
1830V
(Adjustable)
1830V
(Adjustable)
1830V
(Adjustable)
1830V
(Adjustable)
130s
(Adjustable)
0600
minutes (Adjustable)
0250
days (Adjustable)
10600
minutes (Adjustable)
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Normally Closed
Common
Normally Open
MN3024DIY User Manual
5. Other functions
5.1 Dry contact
Working principle: This dry contact can start and stop the generator to charge
the battery. Normally, the terminals are that the NC-N point is closed and the
NO – N point is open; When the battery voltage reaches the low voltage
disconnection point, the relay coil is energized, and the terminals turn to
that the NO – N point is closed while NC – N point is open. At this point,
NO-N point can drive resistive loads: 125VAC/1A, 230VAC/1A, 30VDC/1A.
5.2 RS485/CAN communication port
This port is an RS485/CAN communication port; CAN communication is an optional
function, which is not available in the standard unit
This port is an RS485 communication port which comes with two functions: It
allows direct communication with the optional host computer, through this
port, and enables monitoring of the equipment running status and setting of
some parameters on the computer; It also allows direct connection with the
host computer with the optional RS485 to Bluetooth communication module
through this port. After the module is selected, you can connect the all – in
-one solar charge inverter through the mobile phone Bluetooth APP, on which
you can view the operating parameters and status of the device.
As shown in the figure: Pin 1 is 5V power supply, Pin 2 is GND, Pin 7 is
RS485-A, and Pin 8 is RS485-B ; Pin 5 is CAN- H, and Pin 6 is CAN-L ;
5.3 USB communication port
This is a USB communication port, which can be used for USB communication with
the optional PC host software . To use this port, you should install the
corresponding “USB to serial chip CH340T driver” and APP in the computer.
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6. Protection
6.1 Protections provided
No.
Protections
Description
PV current /power 1
limiting protection
PV night reverse –
2
current protection
When charging current or power of the PV array configured exceeds the PV
rating, it will charge at the rated value.
At night, current is prevented from flowing back into the panels.
Mains input over
3
voltage protection
Mains input under
4
voltage protection
Battery over 5
voltage protection
When the mains voltage exceeds 280V (230V model) or 140V (120V model), the
mains charging will stop and the unit will switch to inverter mode.
When the mains voltage is lower than 170V (230V model /UPS mode ) or 90V (120V
model or APL mode ), the mains charging will stop and the unit will switch to
inverter mode.
When the battery voltage reaches the overvoltage disconnection point, the PV
and the mains will automatically stop charging the battery to prevent damage
to the battery from overcharging.
Battery low voltage
6
protection
When the battery voltage reaches the low voltage threshold, the unit will stop inverting to prevent damage to the batteries from being over discharged.
Load output short 7
circuit protection
Heat sink over 8 temperature
protection
Overload
9
protection
When a short- circuit fault occurs at the load output terminal , the AC output
is immediately turned off and turned on again after 1 second .
When the internal temperature is too high, the unit will stop charging and
discharging; when the temperature returns to normal, charging and discharging
will resume.
When an overload occurs, the unit will immediately stop the AC output. The
unit will try again after three minutes. After five tries, the unit won’t try
again until the unit is powered down and restarted. Refer to the technical
parameters table for information on settings.
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PV reverse polarity
10
protection
When the PV polarity is reversed, the unit will not be damaged.
AC reverse 11
protection
Prevents the inverter output from backfeeding into the AC input.
Bypass over current
12
Built -in AC input overcurrent protection circuit breaker.
protection
Battery input over 13
current protection
When the battery current into the inverter exceeds the current limit for one minute, the inverter stops and switches to AC bypass mode.
Battery input
14
protection
Charge short
15
protection
If the battery is connected backward or the there is a short circuit, the
battery input fuse will blow reducing the risk of damage or fire.
If a short circuit or an excessive overload occurs when charging the battery,
charging will stop.
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6.2 Fault code meaning
Fault code
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 17 19 20 21 22 23 26 29
Fault name
BatVoltLow BatOverCurrSw BatOpen BatLowEod BatOv erCurrHw BatOverVolt
BusOverVoltHw BusOverVoltSw PvVoltHigh PvBuckOCSw PvBuckOCHw bLineLoss
OverloadBypass OverloadInverter AcOverCurrHw InvShort OverTemperMppt
OverTemperInv FanFail EEPROM ModelNumErr RlyShort BusLow
MN3024DIY User Manual
Output Affected?
Description
Yes
Battery undervoltage alarm
Battery discharge average current Yes
overcurrent software protection
Yes
Battery not -connected alarm
Yes
Battery undervoltage stop discharge alarm
Yes
Battery overcurrent hardware protection
Yes
Charging overvoltage protection
Yes
Bus overvoltage hardware protection
Yes
Bus overvoltage software protection
No
PV over voltage protection
No
Buck overcurrent software protection
No
Buck overcurrent hardware protection
No
Mains power down
Yes
Bypass overload protection
Yes
Inverter o verload protection
Yes
Inverter overcurrent hardware protection
Yes
Inverter short circuit protection
No
Buck heatsink over temperature protection
Yes
Inverter heatsink over temperature protection
Yes
Fan failure
Yes
Memory failure
Yes
Model setting error
Inverted AC Output Backfeed to Bypass AC Yes
Input
Yes
Internal battery boost circuit failure
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6.3 Troubleshooting
MN3024DIY User Manual
Faults
No display on the screen
Battery overvoltage protection Battery undervoltage protection Fan failure
Heat sink over temperature protection
Handling measures
Check if the battery circuit breaker or the PV circuit breaker are closed; if
the switch is in the “ON” state; press any button on the screen to exit the
screen sleep mode.
Measure if the battery voltage exceeds rating, and turn off the PV array and
Mains circuit breakers.
Charge the battery until it returns to the low voltage disconnect ion recovery
voltage.
Check if the fan is not turning or blocked by foreign objects.
When the temperature of the device is cooled below the recovery temperature,
normal charge and discharge control will resume.
Bypass overload pro tection, inverter overload protection
Reduce the use of power equipment; Restart the unit to resume load output.
Inverter short circuit protection
PV overvoltage
Battery missing alarm
Check the load connection carefully and clear any short circuit faults. Re-
power up to resume load output.
Use a multimeter to check if the PV input voltage exceeds the maximum
allowable input voltage rated .
Check if the battery is not connected or if the battery circuit breaker is not
closed.
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7. System maintenance
In order to maintain the best long – term performance, it is recommended to
conduct the following checks twice a year.
1. Make sure that the airflow around the unit is not blocked and remove any
dirt or debris from the heat sink.
2. Check that all exposed wires are not damaged by exposure to sunlight,
friction with other objects around them, dryness, damage by insects or
rodents, etc., repair or replace if necessary.
3. Verify the consistency of indication and display with the operation of the
device. Please pay attention to the display of any faults or errors, and take
corrective actions as necessary.
4. Check all wiring terminals for corrosion, insulation damage, signs of high
temperature or burning/discoloration, and tighten the screws.
5. Check for dirt, nesting insects and corrosion, and clean up as required.
6. If the surge suppressor has failed, replace in time to prevent lightning
damage to the unit
or other equipment.
Warning: Danger of electric shock! When doing the above operations, make sure
that all power supplies of the unit have been disconnected, and all capacitors
have been discharged, and then then check or operate accordingly!
MidNite Solar AKA MNS does not assume any liability for damage caused by:
Improper use or improper installation, or location. (exposed to the elements)
Open circuit voltage of the PV module exceeds the maximum allowable input
voltage rating.
Temperature in the operating environment exceeds the limited operating
temperature range.
Disassemble and repair of the MNS Hybrid Inverter without permission.
Force majeure: Damage that occurs in transportation or handling of the MNS
Hybrid Inverter.
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8. Technical parameters
Model
AC mode Rated input voltage
Input voltage range
Frequency
Frequency Range
Overload/short circuit protection Efficiency
Conversion time (bypass and inverter)
AC reverse protection Maximum bypass overload current Inverter mode Output
voltage waveform Rated output power (VA) Rated output power (W) Power factor
Rated output voltage (Vac) Output voltage error Output frequency range (Hz)
MN3024DIY
110/ 120Vac (90Vac- 140Vac) ± 2% 50Hz/ 60Hz (Auto detection) 47±0.3Hz ~
55±0.3Hz (50Hz); 57±0.3Hz ~ 65±0.3Hz (60Hz);
Circuit breaker >95%
10ms (typical)
Available
40A
Pure sine wave 3000 3000 1
120Vac ± 5%
50Hz ± 0.3Hz 60Hz ± 0.3Hz
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Maximum Efficiency
92 %
Overload protection
(102% < load <1 10%) ± 10%: report error and turn off the output after 5 minutes; (110% < load < 1 25%) ± 10%: report error and turn off the output after 10 seconds; Load >125 % ± 10%: report error and turn off the output after 5 seconds;
Peak power Loaded motor capability Rated battery input voltage
Battery voltage range
Power saving mode AC charging Battery type
3000 VA 1HP
24V (Minimum starting voltage 22V) Undervoltage alarm/shutdown
voltage/overvoltage alarm /overvoltage recovery… settable on LCD screen)
Load 50W
Lead acid or lithium battery
Maximum charge current (Settable)
Charge cur rent error Charge voltage range Short circuit protection Circuit
breaker specifications Overcharge protection
PV charging
Maximum PV open circuit voltage PV operating voltage range MPPT voltage range
0-40A ± 5Adc 20 33Vdc Circuit breaker and blown fuse
30A Alarm and turn off charging after 1 minute
100Vdc 30- 100Vdc 30- 95Vdc
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Battery voltage range Maximum output power PV charg ing current range (can be set) Charging short circuit protection Wiring protection
20 33Vdc 1400W 0-60A
fuse Reverse polarity protection
Hybrid charging Max charger current specificatio ns (AC charger+PV charger)
Max charger current (settable)
0-100A
Certified specifications
Certification EMC certification level Operating temperature range Storage
temperature range Humidity range
N oise Heat dissipation Communicati on interface
Size (LWD)
Weight (kg)
CE(EN62109- 1) EN61000 , C2
– 15°C to 55 °C
– 25°C ~ 60 °C 5% to 95% (Conformal coating protection)
60dB Forced air cooling, variable speed fan USB/RS485(Bluetooth/WiFi/GPRS)/Dry
node control
378mm280mm103mm 6.2
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MIDNITE SOLAR INC. LIMITED WARRANTY
MidNite Solar DIY inverters, DIY sheet metal enclosures, DIY breaker boxes and
DIY accessories
MidNite Solar Inc. warrants to the original customer that its products shall
be free from defects in materials and workmanship. This warranty will be valid
for a period of ONE (1) year for all DIY series inverters, DIY sheet metal
enclosures, DIY breaker boxes and DIY accessories.
At its option, MidNite Solar will repair or replace at no charge any MidNite
product that proves to be defective within such warranty period. This warranty
shall not apply if the MidNite Solar product has been damaged by unreasonable
use, accident, negligence, service or modification by anyone other than
MidNite Solar, or by any other causes unrelated to materials and workmanship.
The original consumer purchaser must retain original purchase receipt for
proof of purchase as a condition precedent to warranty coverage. To receive
inwarranty service, the defective product must be received no later than two
(2) weeks after the end of the warranty period. The product must be
accompanied by proof of purchase and Return Authorization (RA) number issue d
by MidNite Solar.
For an RMA number contact MidNite Solar Inc.,
360-403-7207. Purchasers must prepay
all delivery costs or shipping charges to return any defective MidNite Solar
product under this warranty policy. Except for the warranty that the products
are made in accordance with, the specifications therefore supplied or agreed
to by customer:
MIDNITE SOLAR MAKES NO WARRANTY EXPRESSED OR IMPLIED, AND ANY IMPLIED WARRANTY
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE WHICH EXCEEDS THE
FOREGOING WARRANTY IS HEREBY DISCLAIMED BY MIDNITE SOLAR AND EXCLUDED FROM ANY
AGREEMENT MADE BY ACCEPTANCE OF ANY ORDER PURSUANT TO THIS QUOTATION. MIDNITE
SOLAR WILL NOT BE LIABLE FO R ANY CONSEQUENTIAL DAMAGES, LOSS OR EXPENSE
ARISING IN CONNECTION WITH THE USE OF OR THE INABILITY TO USE ITS GOODS FOR
ANY PURPOSE WHATSOEVER. MIDNITE SOLAR’S MAXIMUM LIABILITY SHALL NOT IN ANY
CASE EXCEED THE CONTRACT PRICE FOR THE GOODS CLAIMED TO BE DEFECTIVE OR
UNSUITABLE.
Products will be considered accepted by customer unless written notice to the
contrary is given to MidNite Solar within ten (10) days of such delivery to
customer. MIDNITE SOLAR is not responsible for loss or damage to products
owned by customer and located on MIDNITE SOLAR’S premises caused by fire or
other casualties beyond MIDNITE SOLAR’s control. This warranty is in lieu of
all other warranties expressed or implied.
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