"Charge time is based on surfaced speed. In US boats engines not driving the boat are used for charging. At 1/4 you have three engine charging, 1/3 you have two, etc."
I do the same thing. While in heavily patrolled water I submerge an hour before sunrise an surface an hour after sunset. I still have 25-35% battery or more depending on the season and how far N-S of the equator.
-Pv-
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