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After a month or so of using the 13W solar panel to charge, I've determined that in warm weather and for my 15-20 mile commutes daily, my 13W solar panel usually keeps the battery charged as long as I have sunny days. During the colder half of the year, I'm pretty sure I'll have to put the belt back on unless I get a larger panel... a 100 Watt panel will easily do the job based on testing this tiny 13W panel. I was considering one of those flexible panels for the roof, but I may just buy a rigid one as I'm sure it's cheaper and I can angle it for better results. It may be a good idea to consider an AGM battery or Marine battery... I know I switched to LED lights all around, but I still think this will drain down the battery a good amount in bitter months. Time will tell.
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