SIMARINE SC303 User manual

S I M A R I N E ®
SC303 & SC503
USERS MANUAL
V1.3
EN
USER MANUAL - V 1.3

EN
SC303 & SC503
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1. Introduction .......................................................................... 3
2. Safety .................................................................................... 3
3. Overview .............................................................................. 4
4. Installation ............................................................................ 4
4.1 Cables ................................................................................................................. 4
4.1.1 Power cable ............................................................................................... 5
5. Connecting ............................................................................ 5
5.1 SCX03 installed on the minus terminal of the battery .................................... 6
6. Technical specifications SC303 & SC503 ............................... 6
7. Troubleshooting ................................................................... 8
7.1 Negative current values .................................................................................... 8
7.2 Shunt is not visible on PICO ............................................................................. 8

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1. 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 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 grey water.
· 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 temperature sensor with JST connector and 1x
current sensor up to 300A for up to 75V systems. It can be used for monitoring
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 grey water. SC303 is
capable of measuring continuous current up to 300 A and suitable for maximal
power of 3600 W at 12 V or 7200 W at 24 V
· 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 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 suitable for maximal power of
6000 W at 12 V or 12000 W at 24 V.
2. 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.

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3. Overview
A - Battery
B - Hub - GND
C - 2x SiCOM port
D - 1x JST socket for temperature sensor
E - 2x Voltage & 2x Resistance input
4. 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 use 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 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 determinate the right cable type.
CABLES
Cable length
Cable type
< 5m
No limitations
>= 5m
2x2x0.25 mm2 Twisted pair (recommended)

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4.1.1 Power cable
Minimum power cable cross-section requirement at 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.
5. Connecting
For proper function of Simarine’s SC3O3/SC5O3 digital shunt it is necessary to
take the following steps:
1. Disconnect the battery/battery bank plus and minus terminal, for safety
reason.
2. Connect the shunt to Simarine’s PICO via the SICOM port.
3. Connect shunt voltage sensing input to a battery terminal.
4. Connect the temperature sensor to the shunt and place it near the
battery/battery bank (optional)
5. Connect batteries/batteries bank minus or plus terminal through the shunts IN
terminal.
6. 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 is 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.

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5.1 SCX03 installed on the minus terminal of the
battery
6. 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
Maximal voltage on connections
35 V
Voltage inputs
Range
0 - 75 V
Accuracy
± 0.2 %
Resolution
1 mV
Sampling rate
100 ms

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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 range
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
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

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7. Troubleshooting
7.1 Negative current values
If PICO is showing the wrong sign for 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