We have a Victron Solar Blue 100/30 charge controller. Four pv panels provide between 30 and 38 volts (depending on time of day according to the electrian). The charge controller LEDs have stopped functioning and not sending excess power to float. We have dismantled the system to stop the batteries over charging. We are very remote and totally off grid. The installer (via phone) is claiming that there is not enough volts coming from the panels which is why there is a problem. We think the charge controller is damaged/broken. Advice please...