The jump starter I used to carry onboard was one of those that had a small inverter
built in so I could also run a power
tool for a short period of time. It was useful on the boat
for running tools up on deck
or ashore where there was no power
. I even used it to jump start other people's boats and cars at times. I suppose it depends on if you have a good place to store such a thing, but in my case it wasn't any "trouble" at all and proved to be a useful tool.