What wiring needed 4Powerwall in detached garage 2 back up a house located 20' away?

[PVAndy]

Location: North Carolina
Project will have
42 solar panels 315w total of 13.23kw mounted to roof of barn/garage with enphase micro inverters.
Detached Garage has 100a panel that will need to be upgraded and underground conduit that is about 20 feet long going to main meter.
House is located 20 feet away and has a 200a main panel located about 10 feet from the meter.

My question is if the Tesla power wall is in the detached garage, how can the system be wired so that the main house has back up power when the grid goes down?
Will the tesla power wall get powered from the solar panels while the grid is down? Or will the power wall slowly run out of capacity because enphase micro inverters dont' produce power when the grid is down?

You can use Powerwalls with Enphase MIcros. They will form a microgrid and keep the micros on when you loose the grid. If your load isn't high enough, Powerwalls are fully charged, and you have solar production exceeding usage, the Powerwalls will raise the microgrid frequency out of UL1741 range and the solar will shut off. It will come back on after Powerwalls are drained some. Regarding rewiring the garage, there are ways to not have to do that. Minimum of 2 Powerwalls required with your size sysetm. Each Powerwall is 30A so if combined would require #6 wire. Both house and garage can be backed up by Powerewalls

Andy

[khanh dam]

thanks found forum For Powerwall users — Tesla Forums

[Ampster]

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My question is if the Tesla power wall is in the detached garage, how can the system be wired so that the main house has back up power when the grid goes down?
Will the tesla power wall get powered from the solar panels while the grid is down? Or will the power wall slowly run out of capacity because enphase micro inverters dont' produce power when the grid is down?

Tesla just announced that they are restricting Powerwall sales to projects which include a Tesla solar installation. If that is not a restriction then conceptually like all Powerwall installations, the GT solar is AC coupled to the Powerwall. Tesla has migrated to their own inverters so I do not think Enphase micros would be an option. If they are already existing, yes, they would be AC coupled to the Powerwall or Powerwalls. The best information is to configure a system on the Tesla site or go to one of the Tesla user forums where there are users who have been through the installation process. No worries about the Tesla site, they do not sell your information to anyone and they do not have enough staff to make calls unless you specifically request that they call you.

As to how the system is wired, there are a variety of options since the gateway is separate and could be configured to power an essential loads panel that would power your house. The size and number of breakers will determine how many Powerwalls will be needed if you want all of your home powered. Much of that is discussed on the user forums.

[khanh dam]

Location: North Carolina
Project will have
42 solar panels 315w total of 13.23kw mounted to roof of barn/garage with enphase micro inverters.
Detached Garage has 100a panel that will need to be upgraded and underground conduit that is about 20 feet long going to main meter.
House is located 20 feet away and has a 200a main panel located about 10 feet from the meter.

My question is if the Tesla power wall is in the detached garage, how can the system be wired so that the main house has back up power when the grid goes down?
Will the tesla power wall get powered from the solar panels while the grid is down? Or will the power wall slowly run out of capacity because enphase micro inverters dont' produce power when the grid is down?