<div dir="ltr"><div class="gmail_default" style="font-family:times new roman,serif;font-size:large">Hello, I hope this helps. I have very little PW experience, the one i was involved in had a 1741 transfer switch with grid monitoring on the mains. When the grid failed the switch would disconnect from the Grid and connect the PW to the panel or sub-panel. The PW charges from the AC source when it is fully charged it stops acting like a load, maybe the maximum load it acts like is 7.5 kW when charging but the minimum is 0. I would think three could charge at 3x 7.5 kW or 22.5 kW down to 0 when fully charged. However, the game changes when it comes to discharging. The PWs all have to be authorized to follow the direction of the 1741 monitoring and all have to be coordinated combining to serve the load.. I don't know how this works in practice. There are people with several PWs working in parallel. (maybe these are later models)</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Apr 16, 2021 at 10:38 AM Kirk Herander, VSE <kirkh@vermont.solar> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div id="gmail-m_6698171956062991520gmail-m_3434625845240970857__MailbirdStyleContent" style="font-size:12pt;font-family:Arial;color:rgb(0,0,0);text-align:left" dir="ltr">Hello all,<div>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. </div><div>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.<br><div><br></div><div><p class="MsoNormal" style="font-family:Arial;font-size:16px;margin:0in 0in 0.0001pt"><span style="font-size:10pt"><a name="m_6698171956062991520_m_3434625845240970857__MailAutoSig"><b>Kirk Herander / </b></a><b><a href="mailto:kirkh@vermont.solar" title="Send an email to kirkh@vermont.solar" style="color:blue" target="_blank">kirkh@vermont.solar</a></b><u></u><u></u></span></p><p class="MsoNormal" style="font-family:Arial;font-size:16px;margin:0in 0in 0.0001pt"><span style="font-size:10pt"><b>Owner|Principal, VT Solar, LLC</b><u></u><u></u></span></p><p class="MsoNormal" style="font-family:Arial;font-size:16px;margin:0in 0in 0.0001pt"><span style="font-size:10pt"><b><i>Celebrating our 30<sup>th</sup> Anniversary 1991-2021!!</i></b><u></u><u></u></span></p><p class="MsoNormal" style="font-family:Arial;font-size:16px;margin:0in 0in 0.0001pt"><span style="font-size:10pt"><a href="https://nam02.safelinks.protection.outlook.com/?url=www.vermontsolarnow.com&data=02%7C01%7C%7C9f0330d75a244870112408d685311841%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636842843233477645&sdata=0NjyuKeQbEK6245SNnk8X4XnP9Q%2B%2BqtvcALkdDghvk4%3D&reserved=0" title="Click to open in a new window or tab
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