Building an inexpensive solar heating panel
Air Delivery System
With the panel now secured to your wall or roof, next step is to install the parts needed to deliver air to and from your solar heating panel.
Pictured to the right is how the pieces would assemble together inside the wall and panel.
Cut your 5" hole through the wall using a 5.25" hole saw bit in your drill. If you don't have such a bit available, use a jig-saw or sawz-all to make the cut.
Measure the distance from the panel to the wall. Add the ear'd connector to the ductwork and slide through hole.
Insert the fan into the wall plate and mount the whole assembly into wall and fasten with screws. Next we added an electrical box next to the fan for an on/off switch. Run the wires from the fan to the electrical box.
Add the Baffles
Mount the 20 watt solar panel so it faces south and receives full sun. Run the wire through the wall of the house and into the electrical box. Operating your fan with a solar panel makes your heating panel/collector more efficient because the fan will slow or stop on cloudy days keeping cold air from circulating into your home.
We molded a trap door out of a scrap piece of aluminum. The door is light and easily swings open when the fan is activated. When the fan shuts off, the door closes preventing a backdraft which would reverse the air flow and cool air back into the home.
Once the air delivery parts are installed, you should have a very clean, professional look on the inside. Add a filter to the bottom air inlet to stop any dust particles from entering the panel. When you no longer require solar heat, the air inlet at the bottom should be sealed with a plug made of foam or insulation.