Battle Born seems somewhat similar (internal BMS) - who knows how many different labels get slapped on batteries coming out of the same factory.
Their manual does say you can do series connections up to 48 Vdc. Brian > On Mar 4, 2019, at 8:50 AM, Roberto Kruse <[email protected]> wrote: > > Hi Kienan. > > I am not familiar with these particular batteries but I have some experience > with LFP. > Since there are no com wires from battery to battery, it seems that they have > an internal BMS. > In this case, I would say that these batteries cannot be connected in series. > From what I have seen, if you want a 48V battery bank with LFP, you have to > order the batteries at this rated voltage from the beginning. You can connect > several in parallel. > > Regards, > Roberto Kruse > >> El lun., 4 mar. 2019 a las 7:23, Kienan Maxfield >> (<[email protected]>) escribió: >> Hello all, >> >> I just got back from looking at an off-grid system that is only about 4 >> months old or so, and it has several problems. I have specialized in >> off-grid for 8 years, so most of the problems will be easy for me, but >> there's just one thing that is a bit perplexing and I'm hoping someone might >> have some advice. >> >> The system was "designed" by some retailer in Texas (I don't know who) and >> the home-owner found some local installer to put it together for him (they >> already charged a ridiculous price and they won't come back). The battery is >> a big bank of DKD LiFePO4 batteries, each one says 100 Ah @ 12.8V. They are >> in series sets of 4 for 48V. I think there were 5 strings (500 ah total). >> There are no com wires from battery to battery or anything like that (nor >> did I find anywhere for com ports). I have not yet been successful in >> finding any information about these batteries online. I'm not that familiar >> with this type of battery and I'm hoping that some of you might have some >> info/insight on a couple of questions about this situation. Here's a picture >> of one of the batteries, >> >> <IMG_4362.jpg> >> >> The biggest question is if this configuration is okay. I'm not familiar with >> this type of batteries, but I saw at least one brand that said not to put >> their batteries in series. They said that (at least with their brand) if you >> needed a 48V battery, you couldn't use (4) 12V batteries. >> Does anybody have any thoughts (positive or negative) or experiences with >> these batteries? >> Does anybody have any technical information (like a voltage/SOC curve or >> anything else) for these batteries? >> I will be fixing the other things in his system, but when he asks what I >> think about his battery bank, I don't know what to tell him at this point. >> He also has no idea how to tell how full his batteries are, and since it >> doesn't seem like his batteries have any kind of readout or anything, I'm >> not sure what to tell him on that either. If I could find a Voltage/SOC >> curve or a voltage/SOC conversion table, that would help on that front. >> >> Thank-you, >> Kienan >> >> >> Maxfield Solar >> [email protected] >> (801) 477-0-SUN (477-0786) >> (801) 631-5584 (Cell) (preferable contact number) >> _______________________________________________ >> 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 >> >> List-Archive: >> http://www.mail-archive.com/[email protected]/maillist.html >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> www.members.re-wrenches.org >> > > > -- > > > Ing Roberto Kruse Font | SERC – Costa Rica| [email protected] > Tel (506)2273-4545 | Fax (506)2273-1010 | www.energiasolar.cr > Por nuestro Planeta…, promueva la información digital. > Este mensaje es para el uso de la persona/entidad a la cual está dirigido. > Este mensaje puede contener información confidencial que no debe ser > revelada. 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