![]() The BCU disconnects the load at 11.9 volts, not 10 volts as Sunking has stated. Otherwise you have to repair the fire damage first before you replace them. If you are lucky it just destroys the cells and you get to replace them. The problem is when they fail, they do not disconnect and Bleed your battery to Death like a Vampire. Simple device, they turn on when cell voltages reach 3.6 volts or so, and apply a Load to the battery to Bleed it or Discharge. The industry calls them various names like Balance Boards or Bleeder Boards, in your case they are called BMS Modules in your drawing. They earned their nickname Vampire Boards. Keep in mind those Vampire Boards used to protect your cells are the number one cause of failures and fire. You can charge it anywhere from 13.6 to 14.2 volts. Your Inverter should have a Low Voltage Disconnect that triggers at 11 volts which is 1 volt Higher than your BCU will operate. You do not need it if you are using it to power an Inverter. IMO and industry standard practice would say that it is better to have some protection rather than none.Įasy Peazy. It would be better to have two separate relays, one to disconnect the solar panels from the charge controller if any cell voltage gets too high and one to disconnect the load if the voltage gets too low. At this current it will days or even longer before the battery is damaged by the current draw from the safety circuitry. If the BCU disconnects the battery, the load on your battery will go from 60A to the power drawn by the BCU and BMS modules (<0.020A). If you had a 60A load on your 60Ah battery when this fault occurred your battery could be damaged within minutes. On the flip side the BCU will disconnect the charger and load if the voltage goes to high so it does not destroy the battery.In the event that any of the cell voltages gets too low (<2.6V) or the overall battery voltage gets below 11.9V (average 2.975V/cell) the BCU will disconnect the load from the battery. The BCU keeps taking power from the batteries after the charger and load are disconnected from Low Voltage Disconnect. This makes sure your battery will be completely destroyed if it operates and you do not catch it in time. 2 wires used for Power that connect directly to the battery term post after the fuse.
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