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average sun hours in the USA is between 3.5 and 6 depending on where you are, 4-5 is most common, so really if you plan to ride for 4-5 hours per day (120 to 300 miles, depending on speed) you could very easily use up any stored energy, like I said before, I'd be tempted to run at a higher voltage and have a step down converter to run the motorcycle, BMS's on lithium batteries tend to have a low and high voltage cut off control so you don't kill the battery, hooking it up to a DPDT switch to turn the alternator back on would allow you to run 99% of the time off solar with a safe cheap back up.
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