[RE-wrenches] Current limiting fuse at battery bank

[RE Ellison]

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 <jerrysgarage01 at gmail.com> wrote:
> 
> I agree, fuse it
> 
> Jerry
> 
>> On Oct 22, 2015 3:26 PM, "Tom Ruscitti" <truscitti at 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
>> 
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