On Monday, November 16, 2015 at 6:41:09 PM UTC-5, wrote:
Just for clarification here, while it would be nice to
have an RTG (especially since it takes 100 years to run
out of charge) obviously for the ordinary man and pilot
this would be difficult. Also, adherence to rules is of
course, foremost. It is however a do-able concept that
doesn't violate the law of energy conservation.

That being said, simply replace that component with a
hydrogen fuel cell. A little different, but people are
doing it and it works for an APU charger. Combined
with quick charge batteries, you'll be fine.

https://www.youtube.com/watch?v=_Uxb8v4ylTU

.. . . . . . .

"The efficiency of this process is not limited by the thermodynamic constraints of combustion engines and consequently achieves a fuel-to-electricity efficiency two to three times higher than current engine/generator combinations.

The fuel cell does not have to be recharged once empty, as hydrogen and oxygen/air are continuously supplied to the fuel cell stack, allowing continuous operation."

http://aviationweek.com/commercial-a...pu-replacement

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http://onlinelibrary.wiley.com/doi/1...e1028/abstract