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Even with and average of 4 amps per hour on a day of say only 6 hours of sunlight, you are still putting 24 A/H per day back into the battery. Mine is usually a LOT more than that.
I agree however his is only a 20 Watt panel flat on top of his Van so he isn't going to get anything like a 4 amp average...
Dolphins are so smart that within a few weeks of captivity, they can train people to stand on the very edge of the pool and throw them fish.