This has been happening all too frequently here. We live in a big area of off grid homes, dozens of systems. Lost a customers Trace 2624 this morning; One L-16 in older 24v bank opened internally. PV array/MPPT control zorched inverter as soon as the sun came up. First indication of problems last nite when customer hit microwave to warm up dinner and inverter went crazy. This morning the bad battery showed 3.2v (yes, I would expect 2 or 4 also) the rest the usual 6+v. Turned on PV array, bad battery immediately up to 11v (yes, 6v L16).
Somebody needs to build a "battery condom" with big stacked diodes on a big heat sink or some such solution. A voltage brick wall for system charging inputs. MPPT PV controllers do NOT protect a inverter from input overvoltage if all or part of the battery bank disappears! And last year we saw a nice battery box fire and zorched inverters due to similar -- dual 48v L16 strings, one cell failed and opened, other string dumped everything into the bad one, smoke and flames. Parallel fusing would have stopped that......but not stopped the loss of dual stacked XW inverters from PV overvoltage. Or am I missing something here? Dan Fink, Executive Director; Otherpower Buckville Energy Consulting Buckville Publications LLC NABCEP / IREC accredited Continuing Education Providers 970.672.4342 _______________________________________________ List sponsored by Home Power magazine List Address: [email protected] Change email address & 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
