SIMARINE SC303 & SC503 Digital Shunt User Guide for Customer Service and Technical Staff

Introduction

The SIMARINE SC303 and SC503 are high-precision active digital shunts designed for monitoring voltage, current, and temperature of batteries or battery banks. They are suitable for tracking the current draw of heavy consumers like inverters, bow and stern thrusters, anchor winches, and current generators such as shore power chargers and solar panels. Additionally, they can monitor tanks for fuel, fresh, and grey water. The SC303 and SC503 combine shunt and tank level module functionalities, offering a comprehensive solution for battery and tank monitoring.

Safety Precautions

• Installation should be performed by electrical specialists with appropriate safety equipment.
• Protective clothing and eye protection are recommended when working with batteries.
• Avoid contact with battery acid. In case of contact, wash immediately with soap and water for at least 15 minutes and seek medical support.
• Do not connect anything to a damaged battery to prevent the risk of fire or explosion.
• Lead-acid batteries can generate explosive gases. Ensure no smoking, flames, or sparks near the battery and maintain sufficient ventilation.

Overview

• Battery Input Side
• System Output Side
• 2x SiCOM port
• 1x JST socket for temperature sensor
• 2x Voltage & 2x Resistance input

Installation

• Install the shunt module in a clean, dry place, away from accidental liquid spills.
• Remove the shunt cover by unscrewing four screws.
• Use the supplied voltage cables to connect the shunt no further than 3 meters from the battery/battery bank.
• Secure the shunt using the supplied screws through two holes at the bottom of the casing.
• Reattach the shunt cover and secure it with screws.

Cables

Use the supplied SiCOM cable for connection. For lengths >= 5m, a 2 x 2 x 0.25 mm2 twisted pair cable is recommended.

Power Cable Specifications

Ensure the power cable has a minimum cross-section based on the continuous current and a maximum insulation temperature of 70°C (160°F):

• 500 A: 220 mm2
• 400 A: 150 mm2
• 300 A: 95 mm2
• 200 A: 50 mm2
• 100 A: 25 mm2

Failure to observe these requirements may result in damage or fire.

Connecting the Shunt

1. Disconnect the battery/battery bank terminals for safety.
2. Connect the shunt to SIMARINE’s PICO via the SiCOM port.
3. Attach the shunt voltage sensing input to a battery terminal.
4. Connect the temperature sensor (optional) and place it near the battery/battery bank.
5. Connect the battery/battery bank minus or plus terminal through the shunt's IN terminal.
6. Connect all consumers and charging sources to the OUT terminal on the shunt.

Configuration is required for each connected shunt via PICO. Refer to PICO’s manual for detailed instructions.

Technical Specifications

SC303

• Voltage range: 6 – 35 V
• Temperature range: -20 — 70°C (-4 — 158 °F)
• Power consumption at 12V: 0.8 mA
• Current Measuring range: 0.01 - 320 A
• Maximal current (Continuous): 300 A
• Dimensions: 120 x 120 x 60 mm
• Battery connection: M10 bolts

SC503

• Voltage range: 6 – 35 V
• Temperature range: -20 — 70°C (-4 — 158 °F)
• Power consumption at 12V: 1.2 mA
• Current Measuring range: 0.01 - 700 A
• Maximal current (Continuous): 500 A
• Dimensions: 120 x 120 x 60 mm
• Battery connection: M10 bolts

Troubleshooting

Negative Current Values

If PICO displays incorrect current values, ensure the shunt is correctly installed with the battery/battery bank terminal connected to the IN terminal. If incorrect, reinstall the shunt or switch the IN and OUT terminals via PICO’s configuration.

Shunt Not Visible on PICO

• Ensure the shunt is properly connected via the SiCOM port.
• Check the SiCOM cable specifications if using a non-supplied cable.
• Verify the voltage sensing input is correctly installed.

For further assistance, refer to the detailed manuals available at SIMARINE Manuals.