Wiring question for the brain trust

[wdfifteen]

I have a proposal to put an 11.1 Kw solar array on my barn and wire it into the house. We (meaning my wife) will NOT stand for any more trenching or digging up our landscaping so we are somewhat constrained.
Here is a schematic of the proposed wiring system. My house is two houses in one, with separate wiring and plumbing for each house. Critical circuits in the west end are supported by a generator. The east end has no critical circuits. The electrical panels are fed by a common meter, so they aren't totally separate. The plan is to wire the solar array into the east end panel as shown in the diagram. My question is what happens if the power goes out. The system will still be fed by the 11.1 Kw array, that won't be enough to power the whole house if everything is running, but it might be enough to keep the transfer switch from engaging the generator. So - is there typically some kind of under voltage switch on the solar inverter that will disconnect the solar array if it is overloaded and let the generator do its thing, or what?

[T77911S]

i dont anything about solar. i think there is a guy named redbeard that does.

if the solar gets overloaded i assume there is something that will trip on the solar side. (not that 125 breaker )(i dont know if there is some kind of power converter for solar) your only looking at about 30amps at 240v for 11kw. so you might change that breaker size and then you can use smaller wire. or keep bigger wire to reduce voltage drop.

i think you will have to turn off breakers if the power goes out if you want to run on solar and not the EG.
im just a lowly elec tech.....

[wdfifteen]

I guess I wasn't clear. The 00 wire to the barn is already there. The point of doing it this way, if we do it at all, is that there won't need to be any trenching done.

[T77911S]

ahh. still. no need for a 125. i would use a 30 or 40. you dont want to damage the inverter.
just did a very quick search on solar.


i found this.
During a power outage, your home solar system will automatically turn off. This is to prevent solar energy flowing through the utility grid

you may have to put in a disconnect switch to isolate the two, or use that 200amp breaker to do it if you want to run both at the same time with no comm power.

but yes, the inverter can sense when you have a power loss and turn off.