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Trailer and side car offer the same advantages, except that a trailer is more aero and a sidecar is probably easier to park than backing up a trailer on a bike.
You need to size the generator to be able to output the average power usage of the bike. So assuming that range extension means he's going on a long drive, then it has to provide power equal to the bike's consumption at speed. If ben could find a small trailer and load it up with cinder blocks, he could drive till the batteries are down, time how long it takes, then meter the electricity required to top off the batteries. power usage in kWh divided by the run-down time gives you the kW required to drive the bike, on average.
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