Hi Marco, I partially agree with you. I recently bid Outback, StorEdge, and Pika options for a GTBB customer, partly to understand pricing for myself, and found OB to be so much more expensive. The customer really wanted a system that would be to be able to charge the batteries off a generator in an outage, understandably. But the extra thousands in cost for OB ended up being prohibitive. Add-on rapid shutdown is a killer. So he’s opting for a nice modern high voltage DC system, with optimizers and built-in RSD, but when there’s an extended outage, he’ll have to hope the sun comes out right after the storm to recharge the batteries, or he’ll end up in the dark again, until the grid comes back. Maybe there’s a high voltage inverter that allows generator charging, or a third-party battery charger, that I’m not aware of. Otherwise high voltage systems are very limited for backup, at least in winter storm scenarios.
Bruce Erickson Mendocino Solar Service PO Box 1252 Mendocino, CA 95460 707-937-1701 707-937-1741 fax br...@mendocinosolar.com Connecting Mendocino County to Solar Since 1994 > On Sep 12, 2018, at 6:26 PM, Marco Mangelsdorf <ma...@pvthawaii.com> wrote: > > Aloha all, > > At the risk of whacking at a hornet’s nest…lower voltage DC is soooo 80s and > 90s especially when it comes to grid-tie applications with battery storage. > > The time of OutBack and Schneider and all the others doing 48VDC is drawing > to close. Enough already. Thank you for your service. > > The sooner the industry fully migrates to higher voltage DC (Tesla, LG Chem, > BYD and others), the better. > > marco > > From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org > <mailto:re-wrenches-boun...@lists.re-wrenches.org>] On Behalf Of Peter Giroux > Sent: Wednesday, September 12, 2018 3:03 PM > To: RE-wrenches > Subject: Re: [RE-wrenches] Any thoughts on this approach to adding battery > backup to an existing grid tie system will be appreciated. > > Ken > > We have had terrific success with AC Coupling. Yes there are some > differences from Dc Coupled systems but if built properly, customer is > willing to learn how to use it and maintain it and you put the correct relays > in to shut off the string inverters if battery voltage gets to high, great. > > If you have a customer that refuses to exercise the system, not check the > batteries if they are fla's and overloads it when the power goes down then > not so cool. We have customers that power shave with it, have had backup > power for days until the power came back on as they monitored the loads and > were judicious about use. Ray is right in the sense the customer needs to > learn how to use the system or they can royally screw it up ( yes we have had > two do this, one learned the other not ). > > The Radians have been great work horses for this application, sadly as Ray > mentioned Outback has moved away from it as a primary solution. > > peter giroux > ASAE > Atlanta >> ----- Original Message ----- >> From: Ken Schaal <mailto:k...@commonwealthsolar.com> >> To: RE-wrenches <mailto:re-wrenches@lists.re-wrenches.org> ; Ken Schaal >> <mailto:cwsol...@gmail.com> >> Sent: Wednesday, September 12, 2018 8:11 PM >> Subject: [RE-wrenches] Any thoughts on this approach to adding battery >> backup to an existing grid tie system will be appreciated. >> >> https://www.youtube.com/watch?v=eyhkIfS5Z-Q >> <https://www.youtube.com/watch?v=eyhkIfS5Z-Q> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> List Address: RE-wrenches@lists.re-wrenches.org >> <mailto:RE-wrenches@lists.re-wrenches.org> >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> <http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org> >> >> List-Archive: >> http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html >> <http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html> >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm <http://www.re-wrenches.org/etiquette.htm> >> >> Check out or update participant bios: >> www.members.re-wrenches.org >> <http://www.members.re-wrenches.org/>_______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > <mailto:RE-wrenches@lists.re-wrenches.org> > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > <http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org> > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > <http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html> > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm <http://www.re-wrenches.org/etiquette.htm> > > Check out or update participant bios: > www.members.re-wrenches.org <http://www.members.re-wrenches.org/> >
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