Whoever drew that up made it look like the generator is the common pole. I know what they were getting at, but it's a pretty poor way of depicting it.
On Mon, Jul 20, 2020 at 6:15 PM la...@starlightsolar.com < la...@starlightsolar.com> wrote: > This, from a Nov 03, 2017 Powerwall 2 document, makes sense. Generator > input in place of utility syncs with PV inverters and Powerwall inverter. > > Thank you, > > Larry Crutcher > Starlight Solar Power Systems > > > > > > > On Jul 20, 2020, at 1:25 PM, August Goers <aug...@luminalt.com> wrote: > > Tesla released new offgrid design and installation instructions April of > this year. As a Powerwall dealer, we're under NDA not to share > the document, but the Powerwall will now charge from the generator when it > hits a certain SOC threshold if the PV is not running. I'm not sure about > that caveat of not allowing the generator to run while the PV is running. > It seems like there are plenty of times where there is low solar production > and you want to fire up the generator to top off the batteries. They also > have a low state of charge mode when SOC reaches 10%, that the Powerwall > will turn on during the day for short periods of time just to test to see > if the PV system will couple up to charge the battery. This AC-coupling > method of reviving the battery may or not work depending on loads and PV > sizing / production levels. > > One limitation to the NMC battery technology is that it doesn't work well > particularly in the cold, so offrige Powerwall batteries should > be installed in the heated envelope of the home. > > August > > > On Mon, Jul 20, 2020 at 10:09 AM Jason Szumlanski < > ja...@floridasolardesigngroup.com> wrote: > The Powerwall 2 is now supported by Tesla in an off-grid configuration > from what I heard. It is AC coupled. It cannot interact with generators > whatsoever. You can't charge the battery with a generator and you can't AC > couple a generator to it. If you want a generator, you put a transfer > switch on the load side of the gateway device. If the battery dies, the > generator starts. The generator powers loads, but does not recharge the > battery because it becomes isolated via the transfer switch. The big > downside I see with that is there would be a loss of power to the loads > until the generator fires up. I don't see a way around that. > > I'm not a Tesla certified installer, but I have seen some of these > batteries out in the wild and that's just the way it is - it's an > integrated unit. I'd call it an "AC Battery," kind of like an AC PV Module. > To answer another point in this thread, if the battery reaches its LBCO > it can only recharge with PV in an off-grid scenario. It reserves battery > capacity to turn on occasionally to see if there is PV input. At least > that's how I understand it to work. I don't know what would happen if the > battery actually reached 0%. Seems risky. I'm not sure how you would "jump > start" it. Publicly available details seem scant on this, but there are a > few system owners talking about it if you dig deep on the Interwebs. > > It will be interesting to see what Enphase comes up with. There are > generator inputs on their Ensemble system, but no software support for this > yet. The concept is very similar to Tesla in that there is a gateway > device, essentially a transfer switch with battery controls inside. The > Gateway acts as the AC point of coupling for everything to tie in together. > > I'm not sure why you couldn't use a generator to charge the Powerwall > battery the same way you would charge with the grid. However, you would > need a way to disable PV AC coupling when the generator is running. I can > see how Enphase would be able to do this pretty easily. But Tesla is clear > in that they do not allow a generator to interact with the Powerwall in any > way. > > Jason Szumlanski > > > > > > On Sun, Jul 19, 2020 at 11:43 AM Hilton Dier III <hiltond...@gmail.com> > wrote: > Greetings, Wrenches, > > I have an off-grid client who has been reading the buzz about the Tesla > Powerwall 2.0. I have been reading the data sheets and manual for it and it > appears to be AC coupled only. There was talk of a DC input version, but > apparently that fell by the wayside. I try to be agnostic about technology, > and I'd be willing to subcontract a Tesla-approved installer if, in fact, > this was the best solution. > > Does anybody have experience using the Powerwall 2.0 in an off grid PV > system? Is it AC coupled only? Can it take generator power > without barfing? 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