Multiplus 12/3000/120-50 I am trying to avoid having my LiFePO4 bank always topped up by the charger while on shore power, and still have shore power supply AC while I am attached to shore power long term. I want to have the charger engage when my voltage drops to a low preset limit at which time the charger would fill the LiFePO4 bank, disengage and then stand by for the next time we drop to the preset low. I am on limited shorepower and using power assist.