When you leave home, do you open the service breaker?
Nope, and I don't turn off the plumbing
, either. Yours is an inept analogy which has zero bearing on the discussion.
Besides the electrical
fire issue, I agree that the possibility of damage to onboard systems from nearby lightning
induced surges is real. In fact, the only lightning
damage we've ever had was during a rare marina stay with connected shore power
. We had just cleared in from New Caledonia
into Bundaberg Port marina, and a small thunderstorm came by. There was a single
strike on the nearby big tin shed of the fishery co-op (perhaps 500 meters away). The ensuing surge took out our battery charger
, which was the only thing connected.