When the refrigerator comes on, the battery voltage drops, the charger senses the drop and goes in a charging mode to bring the battery up to a charging voltage. When my charger is in the float mode and the refrigerator starts it shifts in to the Bulk mode because my unit draws about 30 amps when running. Once the refrigerator stops the charger goes back through the cycle from bulk to absorption to float. (BTW, my refrigerator typically runs about twice a day for 30 minutes.)Maine Sail. with the Ultra, how does it handle at-dock power supply for the 12v refer? Should it be in PS or BC?
The charger (ProNautic 1250) on my boat is located in a not easily accessible area. Is there a condition under which it can change from being in the PS most to CEC mode inadvertently? For several years it worked fine in the PS mode, last season it seemed to have shifted into the CEC mode.