AT AMAZON, bestsellers in Automotive. Also, power inverters — “the poor man’s generator.”

UPDATE: Reader Bill Rickords emails:

Glenn, your readers should know that there are two kinds of output from these devices. If you have something that is delicate or needs clean current they need to get a PURE SINE WAVE inverter. Otherwise the cheaper ones put out a SQUARE WAVE and it’s a bit noisy and some motors may not run well with it.

I have some medical issues and have to use an oxygen concentrator to provide additional oxygen to help breathing. The device manufacturer said if I use it in the car to get a PURE SINE WAVE version. Anything delicate or electronic controlled will likely need such.

I have a 1000 watt one in my car to power various 110 volt devices while traveling etc. Works great.

Yeah, we’ve discussed that here before but it bears repeating.