[RE-wrenches] 12V loads

[Drake]

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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