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What size wire 100 amp breaker panel2/9/2024 ![]() ![]() The two busbars exiting left appear to go to utility meter and the grid. These moderate thickness aluminum wires appear to be what feeds your breaker panel. In that case, wires and panel busbars need to be large enough to handle the current, or put a "main" breaker in panel to limit current. If one is PV and can backfeed current (in addition to 100A coming from utility), the sum of those current would go through wires to other breaker panel. You can alternately split the connection from this breaker using Polaris connectors or split-bolts, and run wires to two breaker panels. Then install a 200A (or 225A) panel and put PV breaker on it. You can flip off the 100A breaker, no need to have PG&E shut anything off when changing your breaker panel. That appears to be a service entrance with 100A breaker, separate from your breaker panel for loads. If 125A busbar with 100A breaker, you can connect a 50A PV breaker for 40A continuous, 9600W 100A breaker, but what is the panel rated? QO is 125A busbar, breaker can be 125A, 100A, 70A. I think the limit is 40A breaker, 32A continuous, 7680W It can be a ring adapter under the meter. And the option to feed whole house from it (wired this way, grid backup to house.) With the right interlocked breaker setup you can bypass failed inverter and put loads back on grid.Ī different option is line-side tap. One main panel for the house, other for PV (maybe input to a hybrid or battery inverter.) That can give you a UPS for critical loads. With the fused disconnect, you could instead wire two breaker panels. ![]() Plan your future battery backup while doing this. ![]() That's how I can power my main panel with output of inverter. Having a main breaker in this panel would be optional (since fed with fuses), but having a main means you can put an interlocked backfed "generator" input next to it. Smallest main breaker is 150A, so put a 100A PV breaker at opposite end of the panel. 120% rule means main breaker plus PV breaker can total 270A. If you get a Square-D QO panel, it has 225A busbars. 100A fuse (or breaker) means 80A maximum continuous current, 19.2kW If not, you could put in a 100A fused disconnect and wire that to a 200A panel. Should be, except you probably need a 100A main breaker, which may not be an option for the 200A panel. ![]()
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