Programmable Relay; Voltage Sense; Temperature Sensor; Programmable Analog/Digital Input Ports - Victron energy SmartSolar MPPT RS 450 100 Manual

3.9.2. Programmable relay

Programmable relay which can be set for general alarm, DC under voltage or genset start/stop function. DC rating: 4A up to
35VDC and 1A up to 70VDC

3.9.3. Voltage sense

For compensating possible cable losses during charging, two sense wires can be connected directly to the battery or to the
positive and negative distribution points. Use wire with a cross-section of 0,75mm².
During battery charging, the charger will compensate the voltage drop over the DC cables up to a maximum of 1 Volt (i.e. 1V
over the positive connection and 1V over the negative connection). If the voltage drop threatens to become larger than 1V, the
charging current is limited in such a way that the voltage drop remains limited to 1V.

3.9.4. Temperature sensor

For temperature-compensated charging, the temperature sensor (supplied with the unit) can be connected. The sensor is isolated
and must be fitted to the negative terminal of the battery. The temperature sensor can also be used for low temperature cut-off
when charging lithium batteries (configured in VictronConnect).

3.9.5. Programmable analog/digital input ports

The product is equipped with 2 analog/digital input ports, they are labelled AUX_IN1+ and AUX_IN2+ on the removable User I/O
terminal block.
The digital inputs are 0-5v, and when a input is pulled to 0v it is registered as 'closed'
These ports can be configured in VictronConnect.
Unused: the aux input has no function.
Safety switch: the device is on when the aux input is active.
You can assign different functions to each aux input. In case the same function is assigned to both aux inputs then they will be
treated as an AND function, so both will need to active for the device to recognise the input.

3.9.6. User I/O terminal diagram

Figure 3.
User I/O Connector is located on bottom left side of connection area, diagram shows 3 perspectives. Left Side - Top - Right Side

3.9.7. User I/O functions

Table 2. User I/O Functions - See Installation Section for more details.
Number Connection
1 Relay_NO
2 AUX_IN -
3 AUX_IN1+
4 AUX_IN2+
5 REMOTE_L
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Isolated SmartSolar MPPT RS
Description
Programmable relay Normally Open connection
Common negative for programmable auxiliary inputs
Programmable auxiliary input 1 positive connection
Programmable auxiliary input 2 positive connection
Remote on/off connector Low
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Installation