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Battery temperatures?

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Posted by Gymy Bob on December 29, 2004, 3:00 am
Are there any problems with lead acid (calcium?) batteries staying in
agarage with subfreezing temperatures. Will the charging discharging cycle
be enough to keep them thawed?

Is there any particular types to be avoided for cold usgae like this? Car
batteries do Ok in the sub freezing weather. What about deep cycle marine


Posted by Robert Morein on December 29, 2004, 3:56 am

If discharged, the batteries you are probably thinking of will readily
freeze, ruining them.
Lead-acid batteries can be divided into two groups:
1. Those that use free liquid electrolyte. This encompasses varieties of
plate materials, including lead-calcium, and lead antimony. Gel cells are
also in this group.
2.Those that use barely moistened electrolyte in an impregneted glass matte,
AGM (absorbed glass matt). These batteries are not damaged by low
temperatures, although the capacity is still temperature dependent.

You can't really distinguish between the two types of batteries by plate
composition. It's best to group them mentally as "flooded" and AGM.  Gel
cells are not really relevant to the discussion.

Premium flooded batteries offer the greatest number of charge/discharge
cycles, but must not be exposed to below freezing temperatures. The exact
temperature the battery will freeze depends upon the state of charge, but
it's impractical to worry about the two numbers simultaneously.

For your application, it would appear that Concorde AGM batteries are the
most probable solution. AGMs cost more, and offer fewer cycles, but require
no maintenance. As an added benefit, you can install them in your house
without corrosion worries, and not have to worry about reduction in capacity
as the temperature drops.

Posted by astraea41 on December 29, 2004, 4:59 am
 People have been using batteries in the garage for decades in sub
freeze temps. As long as they are not being stored no problem. Charge
them daily if it is really arctic like and insulate the box if you are
below 10 degrees.

Posted by Jack Hayes on December 29, 2004, 2:07 pm

My 1400 AH flooded battery bank is in a location that often goes below minus
40 degrees for extended periods, it is kept charged by solar panels. Self
discharge is reduced considerable at lower temperatures. At full charge
flooded lead acid batteries will freeze at about minus 67 degrees.


Posted by nicksanspam on December 29, 2004, 3:35 pm

And battery lifetime is increased. An electric battery heater
can more than pay for itself in recovered capacity, as needed.


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