I believe the problem is that he was sending 75W into a closed box without fan running and the resulting overcharge at high temp (all power is converted to gas and heat) and high pressure, destroyed his pack. BTW, I would expect the modules to have a safety vent. Did that not work? Or did you disable that, Robert?
I too have charged a (Classic) with a trickle charge, but had the pack completely opened, so that may have added to the cooling - and I charged for shorter time (but not that much shorter) so I could have gotten the same results - I did feel that the pack had warmed up noticeably towards the end. Cor van de Water Chief Scientist Proxim Wireless Corporation http://www.proxim.com Email: [email protected] Private: http://www.cvandewater.info Skype: cor_van_de_water XoIP: +31877841130 Tel: +1 408 383 7626 Tel: +91 (040)23117400 x203 -----Original Message----- From: EV on behalf of Jan Steinman via EV Sent: Wed 4/1/2015 9:33 PM To: Electric Vehicle Discussion List Subject: Re: [EVDL] Temperature rating (and Blowing them up!) > From: Robert Bruninga via EV <[email protected]> > > That's 300 mA at 250 VDC. The voltage doesn't really matter, does it? If you're charging with a constant-current source, all but one of the cells could short, and the last cell would still see no more than 360 mW. If you were charging constant-voltage, and you had a cell short, then that would cause the other cells to receive more current, which could cause them to short, etc. until you burn up the string. But it shouldn't happen on a correctly-operating constant-current charger, no? :::: Jan Steinman, EcoReality Co-op :::: _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA) -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/ms-tnef Size: 3773 bytes Desc: not available URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20150401/e6c70579/attachment.bin> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
