Watts is easy if you know your voltage and current. 48v x 10a would be 480w, for instance. Watts is power. Watts can be more or less converted to theoretical horsepower. Amps is current. Volts is, er, voltage. 480w x 2hr would be 960 w/hrs. 220ah at 48v would be 10.6 kw/hr which would be a measure of capacity. The thing is, someone might have a 48v system and someone else might have 72, or 96, or 120 or 144v, and just saying 10a or 30a or whatever would be very uninformative. Simply multiply voltage x current to get power. Or at least prominently state your system voltage as well as current.
Think of a wire as a pipe, for electricity. Voltage is sort of like pressure. Current is sort of like flow rate. Power is like the total force of electricity available to get some work done. Then there is resistance, which is sort of like how small the pipe is. More resistance at the same voltage gives less current. And so forth. The basics are really not that hard to grasp. You should at least be comfortable doing Ohm's law calculations and converting kw to horsepower, and estimating how long your battery bank will power your boat. How to select a fuse or a circuit breaker. How to select the proper size wire. You don't have to be able to design your own controller, but some basic electrical knowledge is essential and easy to learn.
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