This is a real issue for us. We plan to circumnavigate, starting next May, in small steps. We think of it as a 10 year circumnavigation, with the boat sitting still for six months each year. Here in America we have been spoiled by fairly stable and predictable power. That will not be true in most of the countries where we will be leaving the boat.
One of the things I want to “tweak” on my electrical system this winter is to add a way for the generator to kick in automatically should the shore power fail. I don’t like the idea of a generator running when I’m not on the boat, but what choice do I have?
I haven’t mentioned it in my blog, but the last few weeks have been painful. Sans Souci has been sitting in Costa Rica for months, and as the rainy season there has started, the quality of the power has deteriorated. I’m seeing power failures 10 and 20 times a day. With no power, the air conditioning stops running, and with the 90 degree heat, and 90% humidity, that’s hard on the boat. Also, the power has stayed off long enough at times that the batteries almost fully discharge. Earlier today my batteries were at 12 volts — which for a 24 volt battery bank is horrible. Discharging to that level can permanently harm the batteries.