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Don't know much about CAL 20's, but on my 28foot yacht I simply run an Industrial quality AC extension lead from the dock, through the cabin hatch to a normal power board fitted with an earth leakage switch for safety. No mods to the boat necessary. The whole lot stows away before departure.
For the DC supply, unless you already have a 12/24v system on the boat you acquire, you're gonna be up for some expense I think.
On a boat your size, I'm not sure of any value for a capability for conversion of AC to the boat's DC system, or vice-versa.
Hope this helps.
Take Care
__________________
Graham
Hakuna Matata
(No worries mate!)
Western Port Marina
Hastings, Vic, Australia
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