Inverters are pretty efficient these days. 90% is not uncommon.
Many have built-in chargers too.
--- In electricboats@yahoogroups.com, William Munger <wmunger@...> wrote:
>
> I was thinking up to a 100 amp.
> The plan is to be full time live aboard in a few years.
> I have researched and found 12volt versions of most everything and my
> thought is, why not build the system in such a way that I would only
> really use the shore power to run the battery charger. While at dock
> the charger would keep the batteries topped off even though I would be
> pulling from the house batteries. So maybe it would not really be
> cycling the batteries and wearing them out. Then while away from dock
> there would not be anything that I could not use just because I was not
> on shore power.
>
> The down side is DC versions of stuff tend to cost a lot more then the
> AC versions. But with DC to AC inverters you loose efficiency.
>
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