123\PowerSwitch 48V 120A
The 123\PowerSwitch is a highly efficient, bidirectional, isolated solid state relay which consumes as little as 0.8mA when turned on. This ensures that you can switch very high power with very little.
- Bidirectional: can switch currents flowing to and from the battery.
- Extremely power efficient, consumes 0.8mA when turned on, much less than a normal solid state relay
- Solid state: no arcs or sparks so safe in dangerous environments with explosive materials
- Isolated control signal
- High noise immunity. Can be used in industrial environments.
- Powerfail safe. If the power falls away, the relay turns off
- Integrated temperature sensor. If the unit is overloaded and gets too hot, it will switch off until the temperature is lower.
- Able to switch 120A continuously and 200A peak for 1 minute @ 48V (62V max).
- Simple interfacing, behaves like a normal relay.
Frequenty Asked Questions
What is the maximum current?
The maximum current is 120A continuously and 200A peak for 1 minute max.
The maximum inrush current is 1200A (<1ms). If you have higher inrush currents, for example because you have big or multiple inverters in parallel, then it is best to add a precharge device.
What is the current consumption?
The 123\PowerSwitch consumes 0.8mA when on. One of industrials lowest current consumptions for solid state relays and especially for power relays.
Does it work with the SmartBMS?
Yes, the 123\PowerSwitch is a perfect companion and it will be functional in no time.
There are multiple configurations possible:
Use one 123\PowerSwitch for the whole installation
In this configuration, the 123\PowerSwitch will be used as “last line of defense”. When a cell has an error, for example when a cell voltage is too high or too low, the PowerSwitch will be turned off and thus all connected chargers and loads will be disconnected from the battery. When the error is gone, the PowerSwitch turns on again.
This configuration is mostly used with combined chargers/inverters which is a setup where the charger and inverter are in the same device like the Victron Quattro/Multiplus.
Connect the 123\PowerSwitch black control wire (negative) to the battery pack negative.
Connect the 123\PowerSwitch red control wire to the “common contact” of the End Board Charge signal relay potential free contacts.
Connect the End Board Charge signal relay “allowed to charge” to the Load signal relay “allowed to discharge”.
Connect the End Board Load signal relay “common contact” to the battery pack +.
Use two 123\PowerSwitches: one for all chargers and one for all loads/inverters
The benefit of this configuration is that when one PowerSwitch is off, for example the “allowed to discharge”, the other PowerSwitch (“allowed to charge”) stays on. Thus if a battery cell is empty, the charger will stay connected to charge the pack.
Connect a wire from the battery pack + to the “common contact” (middle hole) of the Load signal relay and to the Charge signal relay.
Connect the 123\PowerSwitch black control wire (negative) of both PowerSwitches to the battery pack negative.
Connect the End Board Charge signal relay “allowed to charge” pin to the charge 123\PowerSwitch red control wire.
Connect the End Board Load signal relay “allowed to discharge” pin to the discharge 123\PowerSwitch red control wire.
I have multiple loads which in total exceed the maximum current. What to do?
If there are multiple different loads, you can split the loads. For example put inverter 1 on PowerSwitch 1 and inverter 2 on PowerSwitch 2.
You can even connect up to 3 PowerSwitches in parallel to increase the current capacity.
Can the relay be used in harsh environments?
Using the 123\PowerSwitch in harsh environments should be no problem. Integrated techniques ensure leakage currents occurring in humid conditions will not falsely turn the relay on.