How can a Multiplus 5kva inverter feeding a off grid house Essential load be configured to switch the load back to mains power when the battery alarms at its LV setting .. It appears I need a separate AC transfer sw controlled by the Inverter interface . Any advice would be appreciated or where I can find any info on this ? The manual does not say anything about this mode , (just the UPS (no break mode ). which I do not want !