At an absolute minimum a current limiting the fuse at the battery bank is required if not by the law by common sense
In banks with multiple strings in the past I have fused each string I have seen banks in the past where a single battery failed and for lack of a better description the others ganged up on it The results were not pretty! Sometimes we're dealing with thousands of dollars worth of batteries and a 30 or $35 fuse never seemed to be that big of a deal in the overall scheme of things I sleep better at night that way! Just another guy's opinion, Bob ellison > On Oct 22, 2015, at 10:25 PM, Jerry Shafer <jerrysgarag...@gmail.com> wrote: > > I agree, fuse it > > Jerry > >> On Oct 22, 2015 3:26 PM, "Tom Ruscitti" <trusci...@taitem.com> wrote: >> On battery based systems I always install a Class T fuse as close to the >> battery bank as possible. 690.71(C) is a little vague in requiring a current >> limiting fuse only where the available short-circuit current from the >> battery bank exceeds the interrupting ratings of the inverter breaker. >> Inverter breakers vary in their interrupting ratings and battery banks are >> big current sources when things go wrong, so it's just a sensible best >> practice. My question is about service work on systems we didn't install. >> We're quoting the second job this year for battery replacement where there >> is no current limiting fuse installed. It's always a tough question to judge >> what extra work might be required when you touch another contractor's >> system, but does anyone have an opinion about recommending or requiring the >> installation of a fuse at the battery box as part of the battery replacement? >> >> Thanks, >> >> - Tom >> >> -- >> Tom Ruscitti >> Senior Engineer >> >> Taitem Engineering, PC >> 110 S. Albany Street, Ithaca, NY 14850 >> Mobile: (607) 220-7022 >> www.taitem.com >> >> _______________________________________________ >> 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 > _______________________________________________ > 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 >
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