Dangerous, yeah, probably
Funny this topic should come up... Just last night I finished reading Don Casey's "Sailboat Electrics Simplified" and would recommend it highly to anyone who knows nothing about boat electronics (which is why I got it!)While I can't speak to the cost of installing a shore power system, I certainly confirm the 'worry' the original poster had about grounding. Also, from reading the archives on this subject, find an electrician that knows MARINE wiring -- it is different in many aspects from house wiring. If you've ever seen "stray" wiring in a house basement, then imagined that same setup running inside your boat (where you can't reach it easily, where it can get wet, where it can fray, short and start a fire) you'll understand what I mean.I always took my shore power for granted. We use our boat as a mini-cabin at the slip as much as a sailboat, so solar was never an option (I'm from the Tim-The-Toolman generation - *more power - grunt grunt!*.)I used to just plug the big cord into the boat, then the dock, turn on the 'stuff' and didn't worry. Know that I understand it a little better, I'll be doing some serious peeking at the boat and dock wiring, as well as testing for stray current in the water around the boat (a danger I wasn't even aware of!) Growing up, you know not to have the hairdryer too close to the bathtub. Then you get big and plug a big ol' electrical cord into something sitting in the water... hmmm.

According to Don, using an extension cord for your shore power is fraught with danger -- and if you're running AC on that cord you may be overloading the wiring. You may be just fine, but you may wake up to that 'strange smell of plastic melting on fiberglas.' It's probably not the best way to go.I learned a lot from Don's book and while (like most 'expert books') it scared me a bit to read what could go wrong, I appreciate his intent. If nothing else, it's another thing to add to the 'pre-launch to-do' list.Dave Crowleys/v Wind Dreamer