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Old 08-28-2012, 04:30 PM   #1
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Mod: Battery Isolator Cooling Fans

When we bought our 2000 Signature about a yr ago, the house batteries needed replacing, so we removed the LLA golf cart house batteries and installed two Lifeline 8D 12v agm batteries(162 Lbs ea). AGM batteries recharge at a much quicker rate than LLA batteries . After dry camping(WalMart, etc) and pulling the AGMs down near 50-60%, the 200 amp Cole Herse heat sink type battery isolator, #48160, which is located in the rear curbside electrical compartment, gets too hot when we fire up the Cummins and its 200 amp alternator starts recharging the AGMs. It doesn't take too much of this to cause the isolator to fail as a closed curcuit. This defeats the purpose of the isolator(one way valve/diode). When we take it easy on the AGMs, the battery isolator doesn't get hot and its failure isn 't a concern. FYI:There is almost no air movement designed into the stock cabinet(s).

But we do pull down our AGMs ocassionally(that's is why we got them), so we have installed two 2.5” 12v cooling fans($7 ea) just above the battery isolator, to keep it cooler. These fans draw .23 amps ea and move 25 CFM ea. They are controlled by a rotary thermostat switch($30) with an ON/OFF indicator light. I may change out the rotary switch to a thermal snap switch($16), which comes on at 130f, and off at 115f.









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Old 09-06-2012, 02:14 PM   #2
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I went ahead a changed out the rotary thermal switch for a thermal snap switch(120f on, 105f off). I mounted it above and in front of the isolator.

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