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Lesson 3 – Installing The Control Box Assembly

Lesson 3 – Installing The Control Box Assembly

Start by clicking here to watch the next video

Positioning considerations

the control box should be positioned in a convenient location as close as possible to the solar panel layout such that a minimal length of piping will be needed to connect to the line deployed on the roof structure. This will ensure that the water outlet valves in the control box will be positioned as close as possible to the rows of panels, which will minimize loss of water pressure.


Choose a mounting location at least 3 feet on either side of the water spigot at a greater or equal height. This distance ensures the piping has sufficient space to bend.





Routing possibilities for water lines

Consideration should also be given to the various routing possibilities between the control box and the roof. Running the line up alongside a gutter downspout usually works well, as the piping is tie-wrapped along its length. To keep the piping hidden from view, routing the pipe inside the gutter downspout may also work. Routing the pipe along the outside wall of the residential unit exposes the piping, but it is probably the next best option.


WARNING: the Rigid Metal Conduit (RMC) from the inverter to the roof cannot be used as a support structure to get to the roof. National Electric Code (NEC) guidelines dictate that one conduit cannot be supported by another conduit. Each conduit must have its own support system. Please consult your local inspector if unsure of local interpretation of the code.


Try to route the pipe in a location that is free from obstructions and potential hazards. Attachment points should be available so that the piping won’t be affected by weather, falling debris, being tripped on, etc.

Mounting the control box on the wall

To start mounting the control box in your selected location, open the cover, and remove the packet containing the mounting hardware.


Getting packet inside of home kit box                                                 Tabs for home kit box



Putting on tabs – part 1                           Putting on tabs – part 2                          2 of the 4 tabs put on

On one of the corners of the back of the control box, attach a tab using two screws as shown in photos 1 and 2 above. Continue attaching tabs until all 4 corners have tabs put on.


Level box on wall                                   Mark location for drilling                                    Drill hole

Now we are ready to mount the control box on the wall. Position the box at a convenient height and level it. While holding the box in position, mark the drilling locations on the wall through the drilling holes (second photo).

If the wall is concrete, you will need to remove the box and drill the 4 holes with a 3/16” concrete drill bit as shown. Then insert concrete screws into the holes and secure them with appropriate fittings from a ratchet set.

If the wall is any material other than concrete (wood, thin stucco, etc.), you should be able to securely mount the box with self-drilling screws. If the integrity of the mounting material is questionable, consider another location where the box can be securely mounted. This may require additional piping.