Thanks Alastair. I looked in to your website but couldn't find the photo of your solar setup. Can you post a photo so I can understand better.
Thanks in advance.
Cheers
Bris,
Will do but it will take a bit of time. The removalists arrived at 7am this morning and we have very little left for the few days whilst we clean the house . We are also b... exhausted.
We are due to live in the truck for some weeks even though it is not finished. No cupboard doors etc but functional enough. The new house is delayed and will not be finished until May/June so we are hoping to use a friends holiday house starting in a few weeks.
My panels are basically 1.1m x 0.7m. Four panels are mounted in line astern, down one side with the long dimension pointing across the roof. The other two are in line down the other side at right angles to the others. I have enough room for two more panels if I ever need them, I don't think I will. I drilled the sides of the panel frames and installed three M5 SS nutserts on the long side and two on the short. I then bolted on sections of 50 x 50 Al angle with one side flat against the frame and the other side under the panel parallel to the roof/panel. I did not use continuous pieces of angle everywhere for two reasons. First I wanted plenty of ventilation so the panel heat could escape and also so that the slight variation in roof surface could be accommodated. I used poly composite panels and although they are pretty good they are not perfectly flat. I applied a liberal amount of Sikaflex 252 to the lower angle surface and positioned the panels on the roof before it was hoisted up and actually became a roof. I left the proof to cure for some days and then loosened the bracket bolts so the panels could move a bit as the roof flexed whilst being raised and positioned. In the photo the front of the roof is nearest the camera and so I have a fairly solid front surface to minimise rubbish ingress underneath when travelling. I also have continuous down the sides so braches are less likely to catch. Famous last words.
This is an old picture but should do.
This approach did make the roof heavy but worked for me. The brackets seem solid and do allow the panels to be removed and replaced easily.
My six panels are electrically organised as 3 series pairs connected in parallel. Having two panels in series gives better performance in low light because the controller will get a higher voltage and therefore the MPPT can optimise better. Having 3 pairs give better performance in principle because it copes with differential shading better. If one was in high light all the time it would be better to have the six panels in parallel, but that is rarely the case. So far the array has performed well.
must return to the chaos.