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venting battery boxes

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Posted by arthuritis on May 16, 2006, 12:22 am
I have a small studio in my backyard that I'm going to power with a 130
watt Kyocera PV panel. This will supply three Concorde AGM 12V deep
cycle batteries that I will enclose in a polyurethane battery "box",
which is actually a large Rubbermaid deck box. I plan to vent the
system at the bottom and at the top, but my question is - do I need to
install a vent fan in the battery box, or can I just passively vent the
batteries to the outside of the building? This system is 50 feet from
the house.

If a vent fan is not needed, how large should the venting hole
diameters be?

I would not enclose the batteries at all, but since I can't be sure
little "critters" won't get in to the place (like squirrels), I'm
encasing the batteries.

Lou Dalessandro

Posted by Merlin-7 KI4ILB on May 16, 2006, 1:13 am
If you just need to keep the critters out, just drill a lot of 1/4 inch
holes in the box.
 The reason for venting is to keep hydrogen gas from building up to the
point it can ignite from an arc on a battery post etc.
 It does not take a lot of ventalation to prevent this.

 I would ring the sides at the bottom of the box with 1/4 inch holes then
ring the top side of the box with holes the same way.
 Agm's are also sealed batteries so the chances of them even venting at all
is low but still possible.


Posted by beemerwacker on May 16, 2006, 1:16 am

What kind of charge controller do you have?

I like the idea of the deck box; I use something similar. If it's
outside, passive venting (in my  opinion) would work fine. If it's in a
protected area with no natural winds, something like a little computer
fan would work fine. Remember, the more simple, the better.

Now that you mention it, maybe someone should do some research on
exactly HOW much gas a bank puts out under charge and how much venting
it actually needs.

Those 'sploding squirrels can be pretty at night when they pop. I like
the little mice; they  make such pretty blue flashes.

[most pages updated 5-13-06]

Posted by Merlin-7 KI4ILB on May 16, 2006, 1:33 am
  beam me up Scottie..errr beemerwacker....

 AGM's are not supposed to vent at all unless overcharged way bad...
 Well ok,  they would vent if they were burning...

 As for wet cells...rember the Hindenburg?


Posted by arthuritis on May 16, 2006, 1:55 am
 I have a Blue Sky Solar Boost 2000E charge controller, rated at 25
amps. The PV panel is rated at 7.39amps (17.6V).

By the way, what's the best way to install the computer fan?


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