I've never even considered that bobins and I'm not in the least worried about it, I recall however losing my shop's frozen food a number of times through power failures when the supplier was one of the old 'Boards' and the power went out for hours/days before it was restored. They said "You should be insured." the insurers said "Only if you have a service contract for your fridges. " which of course cost annually more than the losses were worth.
I'm waiting now for the energy market to settle so that I can get a deal that will make full use of the solar panels to charge the car.