That sounds like a real pain.You are more self sufficient than us then. At the risk of more or less copying @Stanleysteamer 's question, what do you do for electricity?
We used to get a lot of power cuts and occasionally found that there were only two out of three phases working which is dangerous for the heath of the well pump motor so we have a big diesel 3-phase generator as back up and a small normal petrol one for light duty. Mind you these days it uses almost as much oil as petrol
I've had to get the supply people out to deal with a floating neutral fault on numerous occasions which really is dangerous. Sometimes I have had to explain to them what it is..... also we are prone to lightning strikes, I'm worried about claiming on the insurance again in case they refuse to cover us any more.
Planning to get solar panels when there is less other stuff to do/pay for.
Asking as a real prole about these things, but why does your well pump have to be 3 phase? Is it purely to generate enough pressure or to raise the watter a heck of an height?
The "floating neutral" thing also sounds well dodgy, not that I fully understand how it can even happen.
We too get lightning problems as we are 600 m up in a mountainous area, but the worst that could happen (he says with everything crossed) is that the internet box would get knocked out, So we disconnect it as soon as we know a storm is coming in.
More of a problem can be the wind called the Vent d'Autan which has been known to blow roof tiles off. I guess we are just a pair of softies compared to you and others on here! Oh and the hailstorms with hailstones the size of cricket balls.