featherliteCT1 wrote:I wonder if a low watt 12v heating element in a cooler would keep the water from freezing. For example, these little heaters supposedly only draw 7 watts.
https://www.amazon.com/12V-Flexible-Pol ... E131B28E23Saltydawg also has some low watt heating pads for his batteries.
Also, maybe one or two of those chemical heat pads that hunters put in their boots.
I know for sure a 12 watt heating pad would do it, and they only cost like 12 bucks or so. I have done a few tests with the pads I am using for the battery heater, in one hour they will warm my batteries from 35 degrees F to 46 degrees F. I currently have the thermostat for them set to turn on at 4 degrees Celsius or colder and off at 8 degrees Celsius, so if I turn the heaters on and the temp is 3 degrees it turns on and runs until 8 degrees, or if I turn it on and they are 5 degrees it wont turn on, but the load on the thermostat by its self is .017 amps so no draw unless the heaters are on.
Damn thermostat only shows celsius, but since I dont want them to charge when below frozing, using celsius does make it easy.
As for using hand warmers they use oxygen in the air to work, so throwing them in an airtight cooler wont work once they use up the oxygen.