I agree with the flexible solar panel idea.
The automotive charger approach has shortfalls - if you leave it connected too long the simplistic car charger can overcharge the battery; running non-marine AC from dock to boat is asking for an accident. On a small boat keeping a car charger around to top up the battery is fine while you are puttering around the boat but don't leave it hooked up while you are gone.
Even in Newfoundland there should be enough sunlight to keep the batteries up on a daysailer/weekender.
Do you have US-spec 30A outlets or EU-type 16A outlets on the dock?
sail fast and eat well, dave
beware "cut and paste" sailors.
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