I use a power wheelchair that uses 2 - 12 volt car batteries in series. The charging port gives me easy access to the 24v with no modifications to the chair. I am a big football fan but have a problem with the cold due to circulation problems. I have found a number of electric blankets intended for use in a car. They typically draw anywhere from 4 to 6 amps. Is it feasible to power the blanket from the wheelchair? I'm assuming that the 24v into the 12v designed blanket would cause it to overheat, so what type of control would I need to vary the voltage and therefore be able to adjust the heat output accordingly? I would want something that would be efficient and not just dump off the excess voltage. Also, is there a way to calculate how long the blanket could be used before the voltage in the batteries drops to a certain level? A second option might be to use 18v rechargable battery packs from my DeWalt cordless drill.
Any ideas/comments are welcome.
Any ideas/comments are welcome.