[RE-wrenches] battery venting

[Exeltech]

Hence my reference in item #1 to ensure the box is
reasonably sealed, and my mention in #2 to use as
large a vent pipe as possible.  They minimize
the leakage and pressurization aspect of the box.

If not well sealed, Michael's comment about
positive pressure in the box is applicable.


If you DO vent from the inlet side, do not
use excessive pressure (i.e. do not use a high
volume fan).  A gentle and continual air flow
is all that's needed.

An additional comment that applies no matter
what venting topology you use:

Be sure the charging system is properly adjusted
AND temperature compensated.


There are numerous detail points here, too many
to enumerate in a short post.


1) Do your best to ensure the battery enclosure
is reasonably sealed except for the outlet vent.

2) Use non-corrosive vent pipe of as large a
diameter as is practicable for your circumstances.


Dan


--- On Sat, 12/31/11, Michael Welch <michael.welch at re-wrenches.org> wrote:

> From: Michael Welch <michael.welch at re-wrenches.org>
> Subject: Re: [RE-wrenches] battery venting
> To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
> Date: Saturday, December 31, 2011, 5:20 PM
> 
> Exeltech wrote at 02:16 PM 12/31/2011:
>  
> >4) Install the vent fan on the fresh-air inlet side of
> the box.  
> 
> Not a recommended practice. This pressurizes the box, so
> that the gas can exit through any leaks into the room just
> as easily as up the vent. So instead, the fan should be an
> exhaust fan, pulling from the box, creating a slight vacuum.
> That way any leaks are into the box, not out of it.