Many years ago, when I used to suffer lots of power cuts, I had a Honda
genny with a length of flex going to a 13A plug (!!!) just outside the back
door. During a power cut i would switch off the main switch and plug the
genny into an external 13A socket and fire it up. I always made sure the
heavy loads such as heating were switched off. Lights etc were no problem
for the genny. Maybe the odd TV too.
Then, because the genny was at the bottom of the garden and I'm a lazy
*, when the power was restored in the area I'd simply switch on the
immersion heater. The genny would overload and auto stop and all I ad to do
was unplug it from the external socket and switch the main switch back on.
I know, I know. It's horrible and really crude and nasty but It worked!
Thankfully we no lonnger suffer repetative cuts so I haven't had to stoop so
low for a long time! To be honest I find it hard admitting it!