Battery Powered Blanket - Does it work?

Battery Powered Blanket - Does it work?

So, I have been getting a lot of feedback on the battery powered blanket, some good and some saying that it doesn't get warm enough etc.

So, I have decided to address those concerns with some math.

The battery powered blanket is specifically designed for a stand hunter, who after he/she has walked into the hunting area, and now starts to sit and starts to get cold.

So, first off, there are several limitations that need to be addressed for this situation.  First one is the Federal Government's law regarding electric heating blankets.  Everyone remembers "grandma's" blanket that would get nice and cozy.  Well apparently, it got a little too cozy and started several houses on fire.  So, the Federal Government stepped in and placed limits on electric blanket manufacturers and how hot the blankets could actually get, via the federal flammable fabrics statue.

So, to get a waiver from the Federal Government or to get a manufacturer to violate that law is not very likely.

Because of that restriction, all blankets currently manufactured have a thermostat type of circuitry built into the heating filaments, that actually limit the amount of current (heat) that they can produce.  So, no matter how much power is supplied, the circuitry will cut off the power at a certain temperature.

So, the topic of this blog post, is DOES IT WORK?  Obviously, as in most blog posts the answer is the same, it depends.

So, some math.

There was a study done by Cornell University that breaks out in table form, how much heat the human body emits during various states.  Of course there are many variables, such as physical fitness, square footage of surface area of the body etc.  But, for an AVERAGE person, sedentary, the body emits approximately 300 btu's of heat, or approximately 100 watts.

The body emits during moderate exercise (hiking) approximately 200 watts, and during very strenuous exercise approximately 300 watts.

So, when the hunter is walking into his blind in the morning, most hunters have to stop from time to time to prevent "sweating" and from getting too hot.  Then of course, if you did get sweaty on the walk into the blind, then you are wet, and now very susceptible to getting cold once you start sitting in the blind.

So, if the blanket could produce 100 watts of additional heat (your body produces 100 watts at rest), that would 'equate' to your body temperature while walking.  Likewise if it could produce 200 watts of additional heat, then it would be the equivalent of you doing strenuous exercise inside your blind.

The low power blanket is rated at 12V and 4 amps, so approximately 50 watts.  

The high power blanket is rated at 24V and 6 amps, so approximately 150 watts.

The low power seat heater is rated at 12V and 1.5 amps, so approximately 18 watts.

The high power seat heater is rated at 24V and 2.5 amps, so approximately  60 watts.

So, with those numbers, one should easily be able to quickly determine the appropriate blanket and or seat heater combination.

If you have any other additional questions, please don't hesitate to reach out.