I live off-grid. While I have an inverter to supply 120VAC, I have tried to run as many things either directly off the batteries (24 volts) or off one of the three 24 to 12 volt DC-DC converters. One such choice was a 12 volt RV-style water pump for water pressure in the house. When I initially hooked it up, it tended to cycle a lot when using water. While it wasn't a serious problem when washing your hands or doing dishes, the pressure variations in the shower were a bit irritating. The solution was to add a pressure tank.