Joel:
Don't know.
William
At 03:52 PM 5/1/2010, you wrote:
William,
Do you use tall batteries like IBE? What is the temperature difference
between the bottom of your on-slab batteries and the top?
Joel Davidson
----- Original Message -----
From: <mailto:will...@millersolar.com>William Miller
To: <mailto:jry...@netscape.com>jry...@netscape.com ;
<mailto:re-wrenches@lists.re-wrenches.org>RE-wrenches
Sent: Saturday, May 01, 2010 10:51 AM
Subject: Re: [RE-wrenches] Ideal platform for flooded type batteries:
opinions wanted
Jeff:
This racking system sounds like it would be a nightmare during an
earthquake. We have a system with IBE 2 volt batteries that suffered
major damage during an earthquake in our area in 2003. All of the
batteries tipped over and spilled their entire contents in the battery
room. Fortunately, these batteries were slated for replacement in the
near future.
Now we strap all batteries to the wall with strut and all-thread. Given
the opportunity, we have the framing reinforced during construction. We
do not advertise the restraints as an engineered solution, but rather as
a common sense remedy to minor earthquakes.
In our hot and cold climate. we favor placing the batteries on a slab to
thermally couple them to a more stable temperature source. I laugh when
I see an insulated battery box with large vents. I'm not an licensed
engineer, but it seems pointless to insulate a box and then vent it.
We have tried the shower pan material as a liner, but it was not acid
resistant -- it degraded in two years. Now we use 1/8" sheet neoprene
and build a dam using it and pressure treat lumber to support the rubber.
William Miller
At 08:47 AM 5/1/2010, you wrote:
As you know, cold floors reduce battery charge. We use a support
"shelf" made of pressure treated 2 x 4 on EDGE, separated by 3/8"
pressure treated plates every 2 feet, using 8 foot long boards. This
16" wide by 8 foot long shelf is placed on standard concrete blocks
spaced every 2 or 3 feet, keeping the shelf 8" above the floor. This
puts the battery fill caps at a nice level for re-fill, and the bottoms
off the cold floor which allows good air flow. An occasional acid spill
may cause some minor issues, but we have these shelves in systems now
over 15 years old with no problems. The are also easy to site build.
Jeff Yago
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