SIMARINE SC303 Active Digital Shunt User Manual
- June 6, 2024
- SIMARINE
Table of Contents
SC303 & SC503
USERS MANUAL
V1.3
Introduction
Simarine’s high precision SCX03 (SC303 & SC503) active digital shunt
measures voltage, current, and temperature of the battery or battery bank.
It can be used for monitoring the current draw of heavy consumers (inverters,
bow, and stern thrusters, anchor winches) and current generators (shore power
chargers and solar panels). Additionally, it allows monitoring tanks for fuel,
fresh and greywater.
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The innovative combination of shunt and tank level module. SC303 is an active combo shunt for PICO battery monitor with 2x voltages, 2x tank level or temperature, 1x socket for a temperature sensor with JST connector, and 1x current sensor up to 300A for up to 75V systems. It can be used for monitoring the current draw of heavy consumers (inverters, bow, and stern thrusters, anchor winches) and current generators (shore power chargers and solar panels).
Additionally, it allows monitoring tanks for fuel, fresh and greywater. SC303 is capable of measuring continuous current up to 300 A and is suitable for maximal power of 3600 W at 12 V or 7200 W at 24 V -
The innovative combination of shunt and tank level module. SC503 is a high precision combo shunt for PICO battery monitor with 2x voltage, 2x temperature, 1x socket for a temperature sensor with JST connector, and 1x current sensor up to 500A for up to 75V systems. SC505 is capable of measuring continuous current up to 500 A and is suitable for maximal power of 6000 W at 12 V or 12000 W at 24 V.
Safety
Electrical specialists with proper safety equipment should make installation
of Simarine electronics. When working with batteries, you should wear
protective clothing and eye protection.
CAUTION: Batteries contain acid, a corrosive, colorless liquid that will
burn your eyes, skin, and clothing. Should the acid come in contact with eyes,
skin or clothing, wash it immediately with soap under fresh water for at least
15 minutes, and seek medical support immediately.
CAUTION: Do NOT connect anything to a damaged battery. It could heat up,
catch fire or explode.
CAUTION: Lead-acid batteries can generate explosive gases during
operation.
Never smoke, allow flames or sparks near the battery. Make sure to keep
sufficient ventilation around the battery.
Overview
A – Battery Input Side
B – System Output Side
C – 2x SiCOM port| D – 1x JST socket for temperature sensor
E – 2x Voltage & 2x Resistance input
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Installation
CAUTION: install the shunt module in a clean dry place, protected from accidental spilling of liquids.
-
Remove the shunt cover by unscrewing four screws on top of the shunt cover.
To install the shunt using the supplied voltage cables find a place no further than 3 m away from the battery/battery bank. You can fix the shunt with the supplied screws using two holes on the bottom of the casing. -
Connect all cables
-
Place back the shunt cover and screw the four screws on the cover of the shunt unit.
4.1 Cables
For the SiCOM connection use the supplied cable. If not possible, use the
following table to determine the right cable type.
CABLES
Cable length| Cable type
< 5m| No limitations
= 5m| 2x2x0.25 mm2 Twisted pair (recommended)
4.1.1 Power cable
Minimum power cable cross-section requirement at a maximal temperature of
insulation 70 °C (160 °F).
| Continuous current | Area |
|---|---|
| 500 A | 220 mm2 |
| 400 A | 150 mm2 |
| 300 A | 95 mm2 |
| 200 A | 50 mm2 |
| 100 A | 25 mm2 |
CAUTION: Failure to observe the required cable cross-section can damage the shunt, wiring, or cause a fire.
Connecting
For the proper function of Simarine’s SC3O3/SC5O3 digital shunt, it is necessary to take the following steps:
- Disconnect the battery/battery bank plus and minus terminal, for safety reasons.
- Connect the shunt to Simarine’s PICO via the SICOM port.
- Connect shunt voltage sensing input to a battery terminal.
- Connect the temperature sensor to the shunt and place it near the battery/battery bank (optional)
- Connect batteries/batteries bank minus or plus terminal through the shunts IN terminal.
- Connect all consumers and charging sources to the OUT terminal on the shunt.
Each correctly connected shunt needs to be configured. This is done via PICO in an easy way. The configuration process is described in PICO’s manual.
- PICO manual & other user manuals: https://simarine.net/manuals
It is recommended that the shunt be installed in the negative line if
possible.
CAUTION: After connecting the shunt, make sure that all the connections
between cables and shunt are tight. Loose connections may cause sparks,
heating and even a fire. It may also damage the shunt.
5.1 SCX03 installed on the minus terminal of the battery
Technical specifications SC303 & SC503
SC303
Operating
Voltage range| 6 – 35 V
Temperature range| -20 — 70°C (-4 — 158 °F)
Power consumption at 12V
Operating| 0.8 mA
Current Measuring range
Per-channel| 0.01 – 320 A
Accuracy| ± 0.6 %
Resolution| 0.01 A
Sampling rate| 100 ms
Maximal current
Continuous| 300 A
Peak current ( <1min)| 700 A
Peak current ( <5min)| 400 A
Voltage drop at 300 A| 50 mA
The maximal voltage on connections| 35 V
Voltage inputs
Range| 0 – 75 V
Accuracy| ± 0.2 %
Resolution| 1 mV
Sampling rate| 100 ms
Resistance inputs
Range| 0 Ohm – 65 kOhm
Accuracy| ± 3 %
Temperature sensor – NTC 10k
Range| -15 – +80 °C
Accuracy (-10 – 60 °C, 14 – 140 °F)| ± 3 %
Connectivity| Up to
Batteries| 1
Temperature sensors| 3
Voltage sensors| 2
SiCOM RJ9 Sockets| 2
Installation and Dimensions
Dimensions| 120 x 120 x 60 mm
4.72 x 4.72 x 2.36 in
Battery connection| M 10 bolts
SC503
Operating
Voltage range| 6 – 35 V
Temperature range| -20 — 70°C (-4 — 158 °F)
Power consumption at 12V
Operating| 1.2 mA
Current Measuring rangeC
Per-channel| 0.01 – 700 A
Accuracy| ± 0.6 %
Resolution| 0.01 A
Sampling rate| 100 ms
Maximal current
Continuous| 500 A
Peak current ( <1min)| 1000 A
Peak current ( <5min)| 700 A
Voltage drop at 300 A| 50 mA
The maximal voltage on connections| 35 V
Voltage inputs
Range| 0 – 75 V
Accuracy| ± 0.2 %
Resolution| 1 mV
Sampling rate| 100 ms
Resistance inputs
Range| 0 Ohm – 65 kOhm
Accuracy| ± 3 %
Temperature sensor – NTC 10k
Range| -15 – +80 °C
Accuracy (-10 – 60 °C, 14 – 140 °F)| ± 3%
Connectivity| Up to
Batteries| 1
Temperature sensors| 3
Voltage sensors| 2
SiCOM RJ9 Sockets| 2
Installation and Dimensions
Dimensions| 120 x 120 x 60 mm
4.72 x 4.72 x 2.36 in
Battery connection| M 10 bolts
Troubleshooting
7.1 Negative current values
If PICO is showing the wrong sign for the current value, check if the shunt is
correctly installed. This means the battery/battery bank minus (optionally
plus) terminal is connected to the IN terminal on the shunt. If this is not
the case, you can reinstall the shunt or simply switch the IN and OUT
terminal via the shunt configuration on PICO.
7.2 Shunt is not visible on PICO
If the shunt is not visible on PICO’s menu, check the following:
- Is the shunt properly connected via the SiCOM port to the PICO
- If you are using your own SiCOM cable make sure it has the right square and is twisted.
- Check if the voltage sensing input is correctly installed and doesn’t have the plus and minus terminal switched