Inverter Installation 1A
Story and photography by Capt. Vincent Daniello
With the DC cabling complete, note that the inverter is providing power to a built-in household electrical receptacle, although we’ve added a transfer switch (1) to power one additional electrical outlet (2) to provide electricity for, say, an onboard television or a lamp. When AC power is available from a generator or shore power, this transfer switch simply passes it along. But when these are absent, the switch supplies inverter power only to the outlet.
To more efficiently incorporate inverter capability into the boat’s electrical system, I also disconnected the AC hot (black) wire from the “OUTLETS” circuit breaker on our boat’s electrical panel (3) and then ran a wire from that breaker to the transfer switch input (4) via the boat’s main busses (5). I also disconnected the three wires powering the outlet box, replacing them with the three wires sheathed inside the transfer-switch output cable (6). The neutral (white) and ground (green) wires that feed power into the transfer switch tie to the boat’s main neutral and ground busses (5), but the neutral and ground wires that terminate in the outlet box connect to the transfer-switch output neutral and ground only (7), not to the neutral and ground on the boat’s main busses.