Thanks TD but most solar panels have a diode in between the connections on the back of the panel which I think is there to prevent power going back to the panel , power can only travel one way (out) .
Still nutting out realestate / what's going on roof rack .
Want solar panels ,pole carrier , 4x 10 litre jerry cans , chainsaw and firewood to fit up top , then comes the fun with wiring it all in which I'm not looking forward to but when I get to that stage I'm nearly finished that bit .