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FWIW, a solar panel can only reach ROI within its lifetime when oriented well and used all the time.
A panel charging a battery in the car would not be oriented optimally, maybe the car would be parked in the shade from time to time as well, the battery and converter etc. add cost to the system - but the revenue is better as it replaces electricity generated by the alternator, which is more 'expensive' than grid power.
If you run the panel to directly generate Brown's gas you either only use it when the car runs or, if run permanently you'd store the gas in some balloon or container. While the former is just inefficient, the latter is downright dangerous.
*** Do not store more than a quart of Brown's gas in any location or you might ruin the car and possibly kill someone if it goes bang. ***
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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