Do you leave MH plugged in for power at home?

I keep mine plugged in and the A/C on at a high level during summer to limit the interior temps and have heaters during winter to keep from having low temps(although this year never needed them). Also keep water in toilet to keep seal from drying out.

When I had a home and a drive way, rather than an apartment, the coach was on power from Easter to Thanksgiving. Multi stage converter/charger so never had a problem with the batteries needing water.

Do you have surge protection? What is the frequency of lightening in your area?

I keep mine plugged in. But suggest you open your purse and install an outlet for the amps your unit is designed for 30/50.

Depends on your inverter / charger , if you have a 3 stage that will adjust your charge rate and not boil off your batteries then it Should not be a problem leaving the power connected . If not then you would need to keep an eye on your batteries to prevent boiling off the water again that is if your running wet cell style batteries.