HI Dan, I"m really curious about what the CC saw.
Can you tell us, was it hydro, pv or wind and what was the voc? jay peltz power On Apr 19, 2011, at 8:18 PM, Dan Fink wrote: > We almost had a house fire in the neighborhood a couple months ago from a > parallel battery bank failure....an aging 2x8 L16 48v battery bank (16 of > them), and one bat in bank one got a short and thermal runaway. I teach in my > firefighter safety classes that thermal runaway is really rare, but it sure > happened here fast. How rare is it? Smoke was pouring out of the bat box. > Good thing the homeowner was there. He instinctively hit the main DC buss bar > breakers, which was logical but didn't of course help the fire > situation.....and the result was that all Outback electronics from charge > controllers to the 2 inverter set being fried from too high DC voltage coming > in the wrong end. > > Was something designed or wired wrong here? What is a high-voltage (up to 150 > VDC) off-grid MPPT PV system supposed to do when the battery bank > effectively disappears instantly from the system? > > I didn't design or install the system, but I want to know if I have missed > something obvious here. > > Wind turbines have had the same issue here -- better hit the turbine > shutdown switch before disconnecting the battery bank, or you'll backfeed > high Voc and fry some expensive electronics. > > > All feedback appreciated! > > Dan Fink > Executive Director; > Buckville Energy Consulting > Buckville Publications LLC > NABCEP / IREC / ISPQ accredited Continuing Education Providers > http://www.buckville.com/ > i...@buckville.com > 970.672.4342 (voicemail) > 970.373.1311 (fax) > _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
