I just replaced a 20A generator with a 30A one, and I need to upgrade the generator socket.
The context is a 100% off-grid cabin with two solar panels, a small battery bank, and a 120VAC inverter feeding a few circuits in the house. The generator is used for backup power and to pump water using a 240VAC well pump. Here's the existing setup:
Generator with 20A breaker => 20A cable => L14-20 socket => 12 AWG cable directly to bus bars on a dedicated 100A-rated 8-position panel (Square-D QO Load Center model QO6-12L100DF/S). This panel has two breakers: 20A 1-pole that feeds inverter-charger, 20A 2-pole that feeds the well pump. When I want to charge the batteries, I turn on the generator and flip the relevant breaker; same when I want to pump water. (This was all installed by a licensed electrician who specializes in off-grid work, and it works well.)
All I think I have to do is adjust as follows:
Generator with 30A breaker => 30A cable => L14-30 socket => 10 AWG cable => existing 8-position panel.
- Is this correct?
- The existing 20A breakers and the downstream wiring to the inverter-charger and well pump can just be left as is, right?
- My preference would be to add a 30A 2-pole breaker and feed the wiring from the generator through it instead of connecting directly to the bus bars. That way I would have an interior shutoff (in addition to the 30A breaker on the generator itself). Are there any issues with doing that?