More than anything , this was just a test.
This heater is from my wife's workshop . It's 8kw, and it's probably four or five years old . I bought her a new one for her workshop ( only £79.00), and I had this one to play around with . Now that I've tested it , I know that I'll only need a single 110ah battery, and a cheap 100w solar panel , to give me all the electricity/heating that I'll need.
Once this heater gives up the ghost . I'll probably replace it with a cheap 2kw heater .