Capable of switching between on-grid and off-grid mode automatically, On/Off-Grid CyboInverter can be set up to power electric water heater as primary goal in off-grid mode. When hot water reaches temperature setpoint, inverter will switch to on-grid mode to supply solar power to grid. System can also be set up to run in on-grid mode while grid is up. When grid is down, it can keep electric water heater running in off-grid mode.