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)
On Fri, Apr 16, 2021 at 10:38 AM Kirk Herander, VSE <kirkh@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@vermont.solar <kirkh@vermont.solar>* > > *Owner|Principal, VT Solar, LLC* > > *Celebrating our 30th Anniversary 1991-2021!!* > > *www.vermont.solar* > <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> > > dba Vermont Solar Engineering > > 802.863.1202 > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > >
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