Hi: Please be careful when working with solar system size Lithium packs on the cell level.
We have been doing on-going testing with Lion battery packs from various suppliers and even with their built in temp sensors and other BMS circuits, have already had two "thermal events". Lion is very unforgiving with regards low state of charge, high state of charge, temperature (110F is the max temp at which they should be charged and 140F is the max they can handle). Given the low thermal mass of Lion cells, a high rate of discharge or charge quickly gets the cell temperature into the 110F+ range. As soon as you cross the line things start happening and if the BMS doesn't put a stop to it by turning the battery pack off, it's a very quick slide down the hill from there. JARMO _____________________________________________________________________________________ Jarmo Venalainen | Schneider Electric | Xantrex Brand | CANADA | Sales Application Engineer Phone: +604-422-2528 | Tech Support: 800-670-0707 | Mobile: +604-505-0291 Email: jarmo.venalai...@schneider-electric.com | Site: www.Xantrex.com | Address: 3700 Gilmore Way, Burnaby, BC V5G4M1 *** Please consider the environment before printing this e-mail From: Larry <la...@starlightsolar.com> To: RE-wrenches <re-wrenches@lists.re-wrenches.org>, Date: 03/17/2015 11:41 AM Subject: [RE-wrenches] Load testing Lithium battery bank Sent by: "RE-wrenches" <re-wrenches-boun...@lists.re-wrenches.org> I am repairing and restoring a pair of poorly designed lithium-ion battery bank that suffered over discharge, damaging many cells. After cell replacement I need to perform a discharge test with a 10kW load to verify the remaining capacity. The battery voltage is 105 volts @ 100% SoC and 89.6 volts @ 0% I would like advice on how I can create an economical 10kW load. Water heating element? Wire wound resistors? Are there any GT inverters that will operate at these voltages? Thanks. -- Larry Crutcher Starlight Solar Power Systems _______________________________________________ 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 ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. ______________________________________________________________________
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