[RE-wrenches] Powerwall 2 AC PV regulation

[Matt Partymiller]

They used to advocate 7.9kW AC/DC per Powerwall.  That number may have gone down recently.  Coupling an inverter on the line side of the backup gateway will resolve your issue of meeting homeowner demand.  Tesla will want you to add a CT to that inverter to ensure it does not mess up their monitoring system, though that may already be incorrectly configured and not monitoring the whole home if the system is backup only.

Matt



Matt Partymiller
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From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> On Behalf Of Kirk Herander, VSE
Sent: Friday, April 16, 2021 11:13 AM
To: 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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dba Vermont Solar Engineering
802.863.1202
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