Hi Wrenches, Thanks for your comments Jerry, Our company too has had issues with the problems you discuss. It basically seems that someone has misrepresented what is "doable" with the SMA storage inverter, ABU and Sunny Boy PV inverters. We made the mistake of installing 3 in a row and then finding out these issues with SMA. We really hate having customers mad at us! We thus avoid these situations like the plague, or these days the Covid! So what we have come to understand here is that you cannot AC couple SMA and the LG Chem battery. So what is the point of having the ABU? Thanks to Scott for bringing these issues to light. Vic Guillot Sol Sierra, Inc.
Vic Guillot Sol Sierra, Inc. 209.795.3554 office 209.768.3560 mobile/text On Wed, Jul 15, 2020 at 2:38 PM Jerry Shafer <jerrysgarag...@gmail.com> wrote: > Scot > We do it pretty often and have never had an issue, right out of the gate > we were told that BYD is the only battery option available, l understand > your frustration but how did you determine that LG was an approved solution > in the beginning. SMA is not perfict and I will say they do have an issue > regarding stacking of the SBS's you just can not do it, but on the PV side > it's all good. > Jerry > > On Wed, Jul 15, 2020, 11:17 AM <scot.a...@solarcentex.com> wrote: > >> An update. >> >> >> >> LG ESS is simply not compatible with the SMA represented system of SMA >> storage inverter, Automatic Backup Unit, and its SMA PV inverter. >> >> >> >> Just cannot AC Couple and use solar to recharge the batteries because as >> soon as the battery changes from charging to discharging, it bleeds off >> voltage in its DC to DC converter and that causes the storage inverter to >> drop…and that causes the PV inverter to drop…then it starts anew. >> >> >> >> SMA makes reference to this obliquely in it “background knowledge” >> documentation but even that asterisked verbiage doesn’t drive home the >> point that one just cannot AC couple the PV inverter to gain solar >> charging. And of course if that’s the case, why the heck would one even >> couple via a “whole house backup” SMA Automatic Backup Unit??? The answer >> if course one would not. >> >> >> >> Supposedly the BYD battery which is a true 400V battery and does not have >> the DC to DC converter does not have the same power lapses and will work in >> this architecture. >> >> >> >> Let’s see how SMA fixes this with their documentation representing this >> would all work. >> >> >> >> >> _______________________________________________ >> 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 >> >> List-Archive: >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> www.members.re-wrenches.org >> >> _______________________________________________ > 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 > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > >
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