We’re about to fit the above on a boat, to charge a new bank of LiFePO4 house batteries. A great feature is the activation of the unit by a D+ connection to “H”, in addition to the shutdown feature in the Settings. Both of these should shut down the unit when the engine is not running, protecting the engine battery.
Clearly, it’s vital to prevent the engine battery from discharging should the unit malfunction. We’re considering installing the additional protection of a 100 Amp relay on the input (engine battery) side, also powered by the D+ connection.
If we decide on this route, would the unit still function fully as intended?
@Molteni that seems like overkill to me. Test the unit and see what its status is via the Bluetooth app. If it works accept your design is a success. You may however consider an emergency parallel in case of start battery failure.
Me too. While a dead starter battery is less of an issue on land vehicles than a boat, I think the engine shutdown detection, voltage lockout protection, and remote on/off via H remote is plenty of failsafe protection in my opinion. The idea of an emergency parallel is a good one, too.
If you have solar on the boat, consider adding a small Orion to charge the starter battery from the lithium bank.