Posted: 04/04/2013 at 19:25
Good tip on the solar fans. I have a few old PC fans lying around and had been thinking of doing this. I have automatic vents but some additional ventilation during bright Winter weather would also be welcome to keep the greenhouse fresh. What bits do you need? Can you just connect the panel output to the fans?
Most panels come with a good long length of cable, so not much else is needed. The fans are connected straight to the panel, but I did put a switch in line so they can be turned off if need be.
The hardest bit is finding somewhere to mount the fans. I replaced the manual louvre at the bottom of one end with a sheet of 4mm plywood, cut some fan-sized holes in it and just screwed the fans on the inside with woodscrews. The fans extracting at the top of the other end are in a similar bit of ply which replaced the triangular piece of glass above the door. It has all been going for a few years now. I did have to replace one of the fans last year as it failed, but I too always seem to have old PCs available!