Hi, I'm a business student working on a business concept, and I need some help with an electrical problem.(adsbygoogle = window.adsbygoogle || []).push({});

I am attempting to design a product that stays warm, 50 degrees when the temperature outside is 0 or more. This is insulated, have a volume of around 1200 inches, and is powered by the sun and a battery when necessary.

I believe that this can be done using a low voltage heater similar to an electric blanket. One of the electrical engineering professors on campus told me that one way to calculate the wattage necessary to run a heater of this type was to look at the dimensions of an electric blanket, and divide the number of watts needed to power the blanket by the area of the blanket. Using this formula, I calculate that the average power to run a square inch of blanket was .03 watts.

From what I have found in my research, a typical solar cell produces .5 volts at 4 or 5 amps. I understand that you can figure out the wattage by multiplying volts by amperes. Using this formula, I figured that the typical cell outputs 2 to 2.5 watts.

What I am trying to figure out, is the best way to produce heat using these solar cells. My initial thought is to use a series of resisters to produce heat. I also need a way to keep these heated when the sun is not out so that is why I decided to include a battery.

I have the following questions regarding this project.

1. Are my calculations correct?

2. Is this a possibility, or is the power required too great for a battery to produce?

3. If it is possible, how can I calculate the power requirements to keep this warm at the minimum temperature?

4. How can I figure out the life of a battery when used in this situation?

Any help would be greatly appreciated, if you need any more information please let me know. Thanks in advance

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# Battery and Solar powered heater

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