Inverter Installation 2
Story and photography by Capt. Vincent Daniello
Now examine the second inverter install, shown at right. So it can energize many circuits at once, this bigger, 3,000-watt inverter/charger (the box at the photo’s bottom) powers a subpanel (1) with several breaker switches. Shore or generator power, when available, passes through the inverter’s built-in transfer switch to that subpanel and charges the battery bank that is part of the system.
Loads that used to be wired to breakers on the main panel (2) have been moved to breakers on the subpanel (3). The AC power feeding into the inverter comes from a dedicated circuit breaker on the main panel (4). Inverter input neutral and ground wires are also secured to the boat’s neutral and ground busses (5). Inverter output wires (6) feed the inverter subpanel as well as a separate neutral bus (7) so all loads powered by the inverter also return their neutral only to the inverter. This way, when the inverter is passing shore or generator current through, its transfer switch passes the neutral through as well, but when the inverter is powering the subpanel from the batteries, it isolates its neutral from other power sources. All ground wires remain connected to just one ground bus (8), of course.