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

[oregon_phil]

It just says Powerwall, 13.5kWh capacity. I agree the generic query would recommend a low DC watts per powerwall to get sales up. Interestingly enough, the Tesla string inverters are sized 3.8 kw and 7.6 kw.

[PVAndy]

It just says Powerwall, 13.5kWh capacity. I agree the generic query would recommend a low DC watts per powerwall to get sales up. Interestingly enough, the Tesla string inverters are sized 3.8 kw and 7.6 kw.

13.5 kWh is storage capacity. 3.8kW & 7.6kW are sized to allow a backfed breaker into a 100A(100A Buss) & 200A(200A Buss) panel without having to do any panel upgrades or lineside connection,.

Tesla recommends both max DC and AC per Powerwall. Max AC power per Powerwall is 7.6kW

Andy

[oregon_phil]

Inverter sized to prevent 100amp and 200 amp panel upgrades totally makes sense. Thanks for the reminder.

[Ampster]

Tesla seems to have thought out the cookie cutter approach to drive costs down. I have heard of a few instances where the DC capacity was able to be tweaked based on site specifics. I have not heard how the new Tesla inverter choices may influence that flexibility. At those prices i would be in favor of using an agressive DC to AC ratio if I were to get a proposal from Tesla.