Zeke Yewdall who does a lot of off-grid installations and teaches at SEI has worked with LI batteries from a supplier who works with electric cars like this before so I reached out to him. I know he had a lot of problems with the BMS because it wasn't designed for use with solar and the support he got wasn't great. Here's his response:
"That isn't the one that I did not like. It looks like yet another prepackaged Chinese option, and the price is certainly attractive. Usually, LFP is between 50 and 55 or 56 volts, not 46 to 58.4 like they claim, so I suspect those are actually the voltages where the built-in BMS shuts off the contactors. But if you kept it to the middle range with your solar equipment, then it would probably behave okay. A lot of these BMS's get grumpy if you exceed current, even for the inrush charging the inverter capacitors, so that's something I've run into sometimes. If it can't take a second or two of inrush current, you may need to do a precharge circuit which is a pain. Some (ReLion) seem to not have an issue with inrush though. I've bought some small stuff from ECP before, and they were slow and not super responsive, but eventually, I did get it... Certainly, the type of thing that I'd use on my own system before I tried to sell it to a customer... I've learned over the years to do that with a lot of stuff (and some stuff -- even from well-known manufacturers like Schneider for example that I thought I didn't need to look out for, I've regretted NOT doing that). Also, with Chinese equipment, a lot of us suspect that the certification means nothing -- they learn that it sells better if they print a certification on it, but they don't necessarily actually do the tests and all. So..... unless you can get the actual letter with the UL numbers, I wouldn't necessarily put much faith in that. This is coming more from the radio side of Chinese equipment, but I suspect it could apply to the solar side as well." Thanks, Will -- *Will White* Curriculum Developer e: w...@solarenergy.org w: www.solarenergy.org p: 802-272-3092 NABCEP Certified PV Installation Professional # 093006-34 Do you envision a world powered by renewable energy? Be the change <http://solarenergy.org/donate>. On Thu, Jun 11, 2020 at 4:16 PM <pgir...@mindspring.com> wrote: > Hello Fellow wrenchers. Has anyone purchased and used any batteries from > Electric Car Parts out of Utah. They have a 48 volt, 5, 7.5 and 10 KW Lipo > battery made by Energetech ( China ) . I have a customer that would like to > use the product ( low cost ) but it is tough getting any actual info from > the company i.e UL Certification paperwork or do the batteries have a BMS. > If anyone has any experience with these folks please let me know. Just > looking out for my customer and the lack of response and follow up from ECP > is making me nervous. Thank you all in advance. > > > > Thx > Peter Giroux > > American Solar > > Roswell Ga > > 678 525 0468 > > > _______________________________________________ > 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://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > -- *Will White* Curriculum Developer e: w...@solarenergy.org w: www.solarenergy.org p: 802-272-3092 NABCEP Certified PV Installation Professional # 093006-34 Do you envision a world powered by renewable energy? Be the change <http://solarenergy.org/donate>.
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