Glue and screw the sides together a b and c.
Diy solar collector panel.
Assembly of the solar collector cut the timber treat all sawn ends with a good quality timber preservative.
Do it yourself pop can solar panel construction housing for diy solar panels is made using plywood 15mm 0 6in thick while its front is a polycarbonate sheet 3mm 0 12in thick.
Paint the collector panel using as thin a coating as possible of high temperature black oil base paint black car exhaust paint is a good suggestion.
The back of the solar panel will be insulated properly with a rock wool or styrodur of 20mm 0 8 inch.
You can use tempered glass but it will make your solar panels much heavier.
Diy solar panel assembling the case that will nestle the solar panels will be realized out of wood of 0 6 in 15 mm while in the front a 0 12in 3mm poly carbonate or plexiglas sheet or tempered glass can be used.
Tools and materials table saw hand saw drill press power drill 3 4 drill bit 1 hole saw exacto knife tape measure screw driver digital thermometer caulking gun for silicone adhesive coarse round file.
I have insulated the backside of the solar collector with 20mm 0 8in rock wool.