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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SC303 & SC503
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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 gray water.
· Innovative combination of shunt and tank level module. SC303 is an active
combo shunt for PICO battery monitor with 2 voltages, 2 tank levels or
temperature, 1 socket for temperature sensor with JST connector and 1 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 gray water. SC303 is capable of
measuring continuous current up to 300A and suitable for maximal power of
3600W at 12V or 7200W at 24V.
· Innovative combination of shunt and tank level module. SC503 is a high
precision combo shunt for PICO battery monitor with 2 voltage, 2 temperature,
1 socket for temperature sensor with JST connector and 1 current sensor up to
500A for up to 75V systems. SC505 is capable of measuring continuous current
up to 500A and suitable for maximal power of 6000W at 12V or 12000W at
24V.
2. Safety
Only qualified electricians 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 can burn your
eyes, skin, and clothing. If the acid comes into contact with eyes or skin, wash out
with lukewarm water and immediately seek medical support.
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 - 2 SiCOM ports
D - 1 JST socket for the temperature sensor
E - 2 voltage & 2 resistance inputs
4. Installation
CAUTION: Install the shunt module in a clean and 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 and 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.
· Replace 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 correct 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
500A
220mm2
400 A
150mm2
300 A
95mm2
200 A
50mm2
100 A
25mm2
CAUTION: Failure to observe the required cable cross-sections can damage the
shunt, wiring, or cause a fire.
5. Connecting
For proper function of the Simarine SC3O3/SC5O3 digital shunt it is necessary
to take the following steps:
1. For safety reasons, disconnect the battery/battery bank plus and minus
terminals.
2. Connect the shunt to the Simarine 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 the battery/battery bank minus or plus terminals through the shunt
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 can easily be done
with the PICO unit. The configuration process is described in the PICO manual.
· The 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 all connections between cables
and shunt are secured. Loose connections may cause sparks, heating and even a
fire. They 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
6–35V
Temperature range
From –20 to +70°C (from –4 to +158°
F)
Power consumption at 12V
Operating
0.8mA
Current measuring range
Per channel
0.01–320A
Accuracy
±0.6%
Resolution
0.01A
Sampling rate
100ms
Maximal current
Continuous
300A
Peak current (<1min)
700A
Peak current (<5min)
400A
Voltage drop at 300A
50mA
Maximal voltage on connections
35V
Voltage inputs
Range
0–75V
Accuracy
±0.2%
Resolution
1mV

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Sampling rate
100ms
Resistance inputs
Range
0 Ohm–65kOhm
Accuracy
±3%
Temperature sensor – NTC 10k
Range
From –15 to +80°C
Accuracy (from –10 to +60°C, from 14 to 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
M10 bolts
SC503
Operating
Voltage range
6–35V
Temperature range
From –20 to +70°C (from –4 to +158°
F)
Power consumption at 12V
Operating
1.2mA
Current measuring range
Per channel
0.01–700A
Accuracy
±0.6 %
Resolution
0.01A
Sampling rate
100ms
Maximal current
Continuous
500A
Peak current (<1min)
1000A
Peak current (<5min)
700A
Voltage drop at 300A
50mA
Maximal voltage on connections
35V
Voltage inputs
Range
0–75V
Accuracy
±0.2%
Resolution
1mV
Sampling rate
100ms
Resistance inputs
Range
0 Ohm–65kOhm
Accuracy
±3%
Temperature sensor – NTC 10k
Range
From –15 to +80°C
Accuracy (from –10 to +60°C, from 14 to 140°
F)
±3%
Connectivity
Up to
Batteries
1
Temperature sensors
3
Voltage sensors
2
SiCOM RJ9 sockets
2
Installation and dimensions

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Dimensions
120 x 120 x 60mm
4.72 x 4.72 x 2.36in
Battery connection
M10 bolts
7. 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 the PICO unit.
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