PROJECTA SC420-ND MPPT Solar Charge Controller User Guide

: June 12, 2024
: Projecta

ROJECTA SC420-ND MPPT Solar Charge Controller User Guide

Safety Tips

Please ensure the instructions are read prior to any
Keep instructions in a safe place for future
SC420 and SC440 are designed for indoor use only
Beware of any nearby electrical equipment that may interfere with installing this
Do not connect any AC sources to the controller as it may cause a fire/explosion and will permanently damage the device.
Always check the battery polarities before making a The positive terminal of a battery goes into BAT+ and the negative into BAT-.
The controller is not designed to run without a battery voltage In the event of replacing servicing the battery, always disconnect the solar input first (or fully cover the panels), then replace/ service the battery.
Solar panels can generate high voltages and currents, make sure your solar panels are completely covered from sunlight during
Keep this product out of reach of
Always install a fuse on both the input positive and output positive
Connecting wires to this device can generate sparks, please wear proper insulation gear while installing this
This controller is a negative grounded (positive switching)
Always take the total length of wire into consideration and use the correct wire size, see below for a table of recommended wire size for various current
Lead acid batteries can be Ensure no sparks or flames are present when working near batteries.

Solar Input Current	5A	10A	20A	30A	40A
Wire Cross Section Area (mm2)	1.5	2.5	5	8	10
Wire AWG	15	13	10	8	7

Product Features

4 Stage charging ensures the battery is charged to the optimum level
Advanced MPPT technology to improve charging efficiency in different weather and temperature conditions
Tempered glass cover with screen touch operation and sturdy aluminium housing
Selectable battery chemistry types, including AGM, GEL, WET and Lithium
Auto recognition of 12V/24V battery system voltage
Protects your battery from discharge at Under low light or no light conditions, the solar panel voltage could be less than the battery voltage. The controller contains circuitry which prevents current flowing back from the battery and into the solar panel
Multi charging protections against reverse polarity, over-voltage and over-temperature.
With the use of a battery temperature sensor (optional), the controller will compensate charging voltages when the battery temperature becomes too high (For Lead acid only).
Supports remote display for monitoring additional parameters, such as charging watt-hours, charging current and solar input

Device Diagram

#	Description	#	Description
1	LCD Display Screen	6	External Temperature Sensor Port
2	LED Indicator (PV, BAT, FAULT)	7	RS485 Communication Port
3	Touch Screen Button	8	Solar Input Terminals
4	Installation Mounting Holes	9	Battery Terminals
5	Grounding Terminal	10	Magnetic Cover

Wiring Instructions

Wiring Sequence

Connect the positive battery wire followed by the negative battery
Connect the positive solar array input wire followed by the negative solar array input wire (make sure your solar panels are fully covered to prevent electrical shock)
Connect the external temperature sensor (optional) to its terminal shown above, and place the sensor on the side of a
Connect the external remote LCD through RS485 communication port (if applicable)

The controller is not designed to run without a battery voltage reference. In the event of replacing/servicing the battery, always disconnect the solar input or fully cover the panels, then remove/replace the battery.

Operation

Voltage auto-recognition

System startup: When the battery is connected, the system will automatically recognise the system voltage and briefly display this on the LCD display.

LCD Display Cycle

Short press the touch screen button will cycle through the following four displays:

Battery Voltage
Battery SOC
Temperature
Error Code

To adjust the temperature scale (From °C to °F and vice-versa):

While the display is showing the temperature, long press the touch screen button to enter Set
Short press the button to select the
Long press again to exit and save the

Charging Stages

Bulk Charge (Stage 1) – Utilising MPPT technology, the controller will deliver maximum current until batteries rise to boost level.
Boost Charge (Stage 2) – Once the battery is almost charged, voltage is held constant for 2 hours.
Equalization Charge* (Stage 3) – Only applicable to Flooded/WET and AGM mode. Every 30 days, it will skip boost and automatically run equalization to rejuvenate the internal battery cells
Float Charge (Stage 4) – Only applicable to non-lithium batteries. When the battery is fully charged, it will reduce the voltage to 13.8V to keep the battery topped up.

LED Indication Chart

LED Name	LED Display	Signal Indication
PV	**** Off	**** Not In Charge
**** Steady On	**** In Charge
BAT	**** Fast Flash	**** Battery Over Voltage
**** Steady On	**** Battery On & Normal
FAULT	Off	**** No Error or Alarm
**** Steady On	**** System with Error or Alarm

Parameters Setting

Selecting Battery Type

To select the battery type, long press the touch button while the display is not showing the temperature. This will enter the battery set mode.
Short press while in this mode will cycle through the folowing chemistries: GEL (default) – For Gel type batteries
L12 – For Lithium 12V batteries
L24 – For Lithium 24V batteries FLD – For WET/Flooded batteries
SEL – For Sealed Lead-acid/AGM batteries

To exit and save the setting, long press the touch button.

Touching Button Chart

Key	System Mode	Operation	Operation Description

| ****

View Mode

| Short Press| View Next Page
Long Press| Enter SET mode

Set Mode

| Short Press| Select battery type or tempera- ture scale

Long Press

| Exit SET Mode & save the settings

Error Code Chart

CODE

| ****

Error

| ****

Description

| ****

Quick Troubleshoot

---|---|---|---
E00| No Error| –| –

E02

| Battery Over-voltage| Battery output voltage has exceeded the controller’s max- imum rating| Check whether there is an external voltage applied to the battery

E06

| ****

Controller Over-temperature

| ****

Controller has exceeded the ambient temperature limit

| ****

Ensure the controller is placed in a well-ventilated area.

E07

| Battery Sensor Over-temperature| The surrounding temperature around the temperature sensor is too high| Check the sensor is not near a hot source.

Battery may be faulty if it is too hot

E10

| ****

Solar Over-voltage

| Solar input voltage has exceeded the controller’s max- imum rating| Lower the solar panel’s total voltage connected to the controller
E13| Solar Reverse Polarity| Solar input cables are connected in reverse| Disconnect and reconnect with the correct polarity
E14| Battery Reverse Polarity| Battery output cables are connected in reverse| Disconnect and re-connect with correct wire polarity

Battery Temperature Sensor:

As an option, the unit provides a port to connect the external battery temperature sensor. If it is used, the unit will optimise the charging performance subjected to the battery temperature

Controller Specification

Controller Parameter| | | ****

Specifications

---|---|---|---
Model No.| SC420/SC420-ND| SC440/SC440-ND
System Wiring Grounded| Negative Grounded
Battery System Voltage| 12V/24V

Auto (FLD/GEL/SEL/USER)

Manual (Li/User)

| 12V/24V

Auto (FLD/GEL/SEL/USER)

Manual (Li/User)

600W/24V

| 600W/12V

1200W/24V

Operating Temperature| -35ºC ~ +45ºC
Net Weight| 1.2kg| 1.9kg

Communication

| ****

RS485

Battery Types

| ****

FLD

| ****

SEL

| ****

GEL

(default)

| USER

(applicable only with SC400D Remote display)

| ****

LI

Yes

Remote LCD Meter| Optional

*When the battery voltage drops below 13.2V (26.4V for 24V systems), it will perform a normal charge cycle.

Controller Dimensions

SC420, SC420-ND

Product Dimensions: 19012560mm Installation Area Dimensions: 18080mm Installation Hole Size: 55mm Connection Socket Size: 7.5*7.5mm

SC440, SC440-ND

Product Dimensions: 21815065mm Installation Area Dimensions: 20560mm Installation Hole Size: 55mm Connection Socket Size: 7.5*7.5mm

WARRANTY STATEMENT

Brown & Watson International Pty Ltd (“BWI”) of 1500 Ferntree Gully Road, Knoxfield, Vic., telephone (03) 9730 6000, fax (03) 9730 6050, warrants that all products described in its current catalogue will under normal use and service be free of failures in material and workmanship for a period of three (3) years from the date of the original purchase by the customer as marked on the invoice. This warranty does not cover ordinary wear and tear, abuse, alteration of products or damage caused by the purchaser.
To make a warranty claim the consumer must deliver the product at their cost to the original place of purchase or to any other place which may be nominated by either BWI or the retailer from where the product was bought in order that the warranty assessment may be performed. The consumer must also deliver the original invoice evidencing the date and place of purchase together with an explanation in writing as to the nature of the claim.
In the event that the claim is determined to be for a minor failure of the product then BWI reserves the right to repair or replace it at its discretion. In the event that a major failure is determined the consumer will be entitled to a replacement or a refund as well
as compensation for any other reasonably foreseeable loss or damage.
This warranty is in addition to any other rights or remedies that the consumer may have under State or Federal legislation.

IMPORTANT NOTE

Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure.