[RE-wrenches] DC Fusing/Breakers for Battery Circuits

August Goers august at luminalt.com
Fri Feb 7 16:36:13 PST 2014


Hi All,



Correction: Another Wrench member contacted me off-list and noticed that we
have a class RK5 in one photo and a T in the other photo. This opens up the
question of whether one or both are correct or incorrect. I think both are
rated for 20k AIC for DC voltage but I'll have to look through my order
records to be certain. The R is slow acting and the T is fast acting.



Best,



August



*From:* August Goers [mailto:august at luminalt.com]
*Sent:* Friday, February 07, 2014 3:32 PM
*To:* 'RE-wrenches'
*Subject:* RE: [RE-wrenches] DC Fusing/Breakers for Battery Circuits



Hi Dan,



I've been wondering the same think. We've been fusing with a class T in the
battery box and grounding the negative side of the batteries. See attached
pics. Do you feel that the fuses should be outside of the battery box?



Best,



August



Luminalt Energy



*From:* re-wrenches-bounces at lists.re-wrenches.org [
mailto:re-wrenches-bounces at lists.re-wrenches.org<re-wrenches-bounces at lists.re-wrenches.org>]
*On Behalf Of *Dan Fink
*Sent:* Friday, February 07, 2014 9:27 AM
*To:* RE-wrenches
*Subject:* Re: [RE-wrenches] DC Fusing/Breakers for Battery Circuits



Does anyone have any elegant solutions to this? It's really time consuming
and ugly to run big parallel battery string wires *out* of the battery
enclosure to class T fuses, then back into the battery box. It looks very
ugly and DIY, and in conduit adds a few hundred to the install cost just
for labor. The Class T fuses and blocks themselves are not particularly
expensive.

I have been recommending parallel fusing on battery banks of 2x8 L16s and
over now, after a nearly tragic incident with a bad cell that shorted. The
(perfectly legal) wooden battery box made the fire much worse. A pet peeve
of mine.




Dan Fink,
Executive Director;
Otherpower
Buckville Energy Consulting
Buckville Publications LLC
NABCEP / IREC accredited Continuing Education Providers
970.672.4342
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