Dan,
I'm using lead acid golf car batteries but my regime for temperature
control might be helpful information anyway. The battery box side walls are
insulated with two 1/2" layers of standard foil faced isocyanurate foam
building insulation and I use slabs of polyurethane foam two inches thick
above and below the batteries. In winter weather the charge and discharge
cycles (daily at work and at home) raise the temp gradually throughout the
week. It sits in an unheated garage all weekend and will start out the week
in winter usually in the 50F range and hit the low 90F area by Friday, then
cools back down over the weekend. In the spring I remove the top foam slab.
As the weather warms I may prop the box lid open slightly while charging. In
the hottest parts of the summer, I prop the lids up with running muffin fans
to ventilate while charging. I'm in New England so winter temps will
occasionally get to 0F but it rarely gets below freezing in the attached
garage space. Fans in summer keep the battery temps below 100F. I'm
considering changing over to CALB cells also so thanks for starting this
thread. Lee Hart's resistive wire (electric blanket or soil heater) with a
metal sheet above is likely what I'll install if I do the conversion.
Regards,
John Nicholson
www.evalbum.com/2672
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