At 08:25 -0800 11/12/10, Joel Davidson wrote:
I recommend insulation. In general, operating temperature is very important. Batteries last longer if kept cool. However, a battery below 60 degrees F (15.5 C) has reduced capacity. Temperatures above 77 F (25 C) increase capacity only slightly but they significantly reduce battery life. Batteries operating regularly above 85 F (29.4 C) lose have their operating life.Joel Davidson
OK so you recommend insulation to keep them cool? For me, insulation is more likely to result in higher temperatures in summer. In winter, an insulated space is obviously ideal for performance depending on the kind of winter (which seems to be a variable these days). In summer, insulation directly on the battery seems unlikely to keep them cool. On charge they will definitely need a temperature sensor and will be likely to get hotter than ambient if insulated.
-- Hugh Piggott Scoraig http://www.scoraigwind.co.uk
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