Since I read the meters at our 26 slip marina there are some things you discover about boats and electricity use.
1. It's only a few folks that use most of the power. We had one idiot that ran his A/C 24 x 7 all summer. He ran up a $400 electric bill but worse he had so much condensation
inside the boat he rotted out major sections of the interior
and trashed all his batteries. Dumb folks usually get dumber over time.
2. A bad charger
will over charge your batteries really well and keep on charging
them using way more electricity than you think is possible and way more than is required. This leaves you trashed batteries and a big electrical
bill. You don't have to actually use the electricity for a useful purpose to run it through the meter but it costs you just the same. This would be a good thing to check out as this has happened to several folks that swore they never used that much electricity here. That would work out to 3 boats in 26 slips over 4 years. These numbers are higher than you might think.
3. The meters work - most all the time. It's the first thing people say - "The meter must be broken!". When they go bad they usually stop reading rather than read high. A busted meter will usually be in your favor but it is possible. I've never seen one after having them checked out.
My best advice is never plug your boat into an electrical socket unless you need it for something you will be present for. Keeping the boat plugged in all the time is asking for trouble and the root to most things that go bad. It increases you risk of lightning
damage since the electrical system
can be inducted right up your power cord. 80% of all boat fires are caused by electricity.
Not paying the electric bill because you think the meter is wrong won't win you any friends. If you did this at your home the electric utility would shut you off. You generally have to file a dispute and pay the bill then work out the problem to get a refund. BTW, at the dock
the power company does not own the meter most of the time. They only read the mains that feed the dock
. Unless they send you the bill then you have to deal with the marina directly.