[RE-wrenches] Powerwall 2 AC PV regulation

[Barton Churchill]

You can just land the new PV to the same "generation" panel that already hosts the 3 Powerwalls and existing PV inverter output breakers. There should be no loads on this panel. The Powerwall AC coupled solar limit is 7.5 KW AC per Powerwall, note AC not DC. The DC rating is irrelevant here. If the combined PV AC inverter output is less than 22.5 kW the system will work fine. Tesla does have a list of approved PV inverters but unless you're looking to connect something over 3 years old it should be fine.


[cid:f7580fd8-6285-4e79-9ad8-512cb4416200]Barton Churchill
Director, Power Division
2042 Stadium Drive Suite 2 • Bozeman, MT 59715 • (O) 406-587-2917 • (D) 406-589-4493
235 E. Broadway • Jackson, WY 83001 • (O) 307-200-2210
bchurchill at energy-1.net<mailto:blansing at energy-1.net>   |    www.energy-1.net<http://www.energy-1.net/>


________________________________
From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> on behalf of Kirk Herander, VSE <kirkh at vermont.solar>
Sent: Friday, April 16, 2021 9:13 AM
To: re-wrenches at lists.re-wrenches.org <re-wrenches at lists.re-wrenches.org>
Subject: [RE-wrenches] Powerwall 2 AC PV regulation

Hello all,
I am adding more PV to an orphaned Powerwall 2 AC system (which is all new to me), -3- PW's stacked to total about 40kwh of usable storage. it presently has about 13kw of PV, though -2- SMA inverters, feeding into it through a common subpanel between the PW gateway and the main panel. I'm wondering if there is a limit to the amount of PV the powerwall can regulate/backoff (or use for battery charging) during a utility outage. What is the max PW charge rate? I need to add about 10 kw of PV to produce the owners goal of 100% coverage of electrical demand.
If necessary for safety, i assume the extra pv inverter can be routed to the main panel, and then won't participate in battery charging if the grid goes down. Am I correct? Thanks. The PW manuals are of little use here.


Kirk Herander / kirkh at vermont.solar<mailto:kirkh at vermont.solar>

Owner|Principal, VT Solar, LLC

Celebrating our 30th Anniversary 1991-2021!!

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