Ray,
If golf cart batteries can't surge over 2000 amps, then it would seem
that the fuse in line with the QO can be deleted in some cases. Is
the 2000 A surge for one 6 volt battery or 2 in series?
Fuses can be put in the QO enclosure ahead of the loads and DC rated
Class T fuses can be bolted to battery terminals (code questionable,
but a good method for safety). In the old days we often had a DC
system with a few lights and maybe a Sunfrost. That way, if the
inverter went down, the home wouldn't be left in the dark. DC was
tricky code wise, but not impossible.
Thanks
Drake
At 08:03 PM 8/10/2012, you wrote:
The QO breaker has an AIC of 5000 amps. The usual golf cart
batteries have a short circuit current of about 2000 amps, so you
could do a set of 4 golf cart batteries at 12v, without worrying
about the extra fuse.
Once again, if the system gets any bigger, they should just go to an
inverter based design.
Also, to be clear, I don't risk my license installing ATC fused
systems on permanent structures. (strictly RVs, and portable set ups)
As soon as I'm doing an install covered by the code, it's going to
be code compliant, and it's going to be inverter based.
Take a look at Midnite's Mini DC panel wired to Magnum's smallest
inverter. You'd be surprised how cheap you can do a code compliant
inverter based system, and how much money you can waste trying to do
a code compliant DC only system.
Ray Walters
NABCEP certified since 2004
On Aug 10, 2012, at 4:35 PM, Drake wrote:
> I second using QO load centers. You will want to put a fuse,
like an FRN-R, between the battery and the load center, as the QO
breakers don't have a high AIC rating. 12 V systems can be wired as
easily as a regular AC system.
>
>
> At 05:05 PM 8/9/2012, you wrote:
>> Hello,
>>
>> I've been looking at a lot of hunting shacks, fish houses and
other 12V loads setups and was wondering how people go about
setting these up? What are people using for load termination, fusing?
>>
>> I'd like to keep all disconnects and fusing in one "box".
>>
>> Jesse
>>
>> Sent from my iPhone
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