Les, you might try doing a reboot. Turn off all electricity,disconnect shore power, turn off the batterys, cover the solar panel, turn the inverter switch off and disconnect the ground lead (black) first. then remove the hot lead (red) and find something to do for 15 to 30 minutes. That should be long enough to let it reboot. Reconnect everything in reverse order except external shore power. Make sure you turn the inverter switch on then go to the remote panel and select invert to check it. Good luck.