[RE-wrenches] Powerwall 2 AC PV regulation

[Jerry Shafer]

Wrenches
This customer with an orphan PW, not to compromise the factory warranty on
the batteries, it would be safest to just grid tie any additional PV and
not touch the existing system from the gateway down.
Jerry
NABCEP PV Inspector

On Fri, Apr 16, 2021, 8:38 AM Kirk Herander, VSE <kirkh at vermont.solar>
wrote:

> 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 <kirkh at vermont.solar>*
>
> *Owner|Principal, VT Solar, LLC*
>
> *Celebrating our 30th Anniversary 1991-2021!!*
>
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>
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>
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