I agree the element and thermostat must be changed at the same time. Back in the day when there was money in the budget to pay an electrician a call...
I am a plumber and sometimes I do change elements... But I feel it should be done by an electrician....WHY?.... a while back I was called out because...
I got up early this morning to review more COC's sent to me - I get moaned at by the AiA guy if I say I write a report on an installations CoC - only...
The way I wire up the batteries, from the fuse holder to the battery there is 2 x 25mm cables, one feeds the top of the rack and the other the bottom...
Stick with the 25 mm sq cables for your battery connections since they match your battery's rating. For the fuse holder to inverter connection, a 50...