Hi Jason I’ve seen this happen to battleborn. They sell a totally cobbled part to prevent that.
Jay > On Jan 31, 2021, at 3:35 PM, Jason Szumlanski > <[email protected]> wrote: > > > I had another battery manufacturer's BMS contactor weld shut due to an inrush > current problem with another brand of inverter. That was "fun." It seems > strange that this issue of cap loading hasn't been addressed. Hopefully it > will be. > > To clarify the SOC not drifting... Are you saying in an off-grid system you > can reliably use the Sol-Ark SOC to trigger generator start and charging > parameters without causing discrepancies in SOC on the battery meter itself > and balancing is not a problem? If so, I'm comfortable with that I think. > > Jason > > > > >> On Sun, Jan 31, 2021, 3:45 PM Jeff Clearwater <[email protected]> >> wrote: >> Hey Jason, >> >> I've installed a few systems now using Fortress eVaults. I like them as >> they are a nice 18.5 KW increment and the BMS seems hardy - nice interface >> screen showing SOC on each battery. >> >> However, call Fortress and discuss the status of their closed loop >> communications (and talk to Sol-Ark about it too). The tech at Fortress >> told me that less than 4 eVaults the closed loop communication is more >> trouble than it's worth between batteries. That appears to be because they >> simply have not employed a soft-start resistor and the batteries shut down >> when exposed to cap loading during inverter start-up. They said relying on >> the individual battery BMSs works fine. I've found that to be true so far - >> no drift in SOC from battery and Sol-Ark. >> >> Their eFlex system is supposed to be totally closed loop communication >> between batts and with a Sol-Ark. It's a bit of a small increment for large >> systems but may be worth it. >> >> I imagine they will offer an upgrade for eVaults or a new model soon with >> full closed loop. Sol-Ark tech said they were still working with them on >> that. >> >> Hope that helps! >> >> Best, >> >> Jeff >> >>> Jason Szumlanski January 31, 2021 at 11:27 AM >>> I'm seeing a lot of pictures of LiPO battery systems and people are >>> mounting equipment above them like load centers, inverters with >>> disconnects, and other serviceable enclosures. Some of these battery >>> systems are 24 inches deep or more. This seems to violate NEC 110.26 >>> requirements for the other serviceable equipment, but the pictures are >>> proudly displayed as models of success. Even slender Tesla Powerwalls stick >>> out significantly when stacked 2 or 3 deep and would be more than 6 inches >>> deeper than a standard load center. Sure, the battery cabinets make great >>> places to rest tools while working, but does anyone else see this as >>> problematic? >>> >>> Jason Szumlanski >>> Florida Solar Design Group >>> >>> >>> >>> _______________________________________________ >>> List sponsored by Redwood Alliance >>> >>> List Address: [email protected] >>> >>> 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/[email protected]/ >>> 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 >>> >> > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > 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/[email protected]/ > 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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