How do we defrost our solar panels to get some power?

So with all of the recent cold weather hitting us from the Artic, we have some issues to sort out with Matilda

Solar panels covered in ice, Water tanks freezing, Sink tap freezing, needing some insulation panels adding to a couple of internal places, Diesel heater running a fault code and a heater hose coming off the unit.

All due to the -7 degrees and us not being in her permanently.