The Multiplus is installed in a motorhome. Before the electric water heater turned on, the DC buss was at 13.60V (the float voltage), and current in/out of the battery was 0.0. But when the electric water heater turned on, the AC voltage dropped from 120V to 115V and the DC output of the Multiplus Compact dropped from 13.60V to 13.55V and the current draw from the battery went to -4.5A (there are 12V DC loads always present). The Multiplus DC voltage slowly climbed back to 13.60V, and the battery discharging slowly went back to 0.0V, but this affects my battery monitor’s SOC readout (slowly dropping over time while on shore power). And this behavior needlessly discharges my battery. Why isn’t the output of the Multiplus more stable with varying AC input voltages? Did I get a defective Multiplus Compact?