Chose Lead Acid mode, OVP have to set higher than Charge volt.
Batt end volt you cannot set higher than 48V. For battery LFP 16S, discharge to 48V mean the battery totally EMPTY.
Megarevo said, they will change the sofware to Increase the Battery End Volt value soon.
in paralell system, if both use common battery, so the battery have to communmicate with master inverter by CAN port, battery type set is Lithium.
if not, 1 of these inverter has error "bus over vol"