Attach one foot to each of the rear foundation bolts. Attach one leg to the top of each side rail using the hole in the side rail for the desired tilt angle. Tighten All Hardware. Most photovoltaic modules have one or two junction boxes on the back to facilitate wiring. A single junction box usually contains two positive terminals, two negative terminals, and other terminals that are not electrically connected to the module but are useful in making series interconnections in 24 and 48 volt systems.
Dual junction boxes each contain positive or negative terminals.
A bypass diode should be installed whenever three or more modules are connected in series, such as in 36 volt plus systems. Figure 1 shows the connections inside a junction box. The following diagrams show wiring details for series and parallel connections of two and four modules. This is the method that we recommend as well. An example of two modules wired in parallel at the combiner box to get 12 volts.