I wonder if it would be worth it for even 100 watts. If you ride on the highway at 60 mph for an hour at 120 mpg, You will have burned 17,000 Watt hrs of gas. Figure a worst case efficiency of gas to electric of 20% and the 100 Watt hrs of conversion electric has saved you 500 watt hrs of gas or 2.9%. If you only get 50 Watts out of the system you will be at 1.5% gas savings or less.
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