16
Power Supply and Wiring
Solar Power Systems
Tilt Angle
from horizontal
Vertical Distance Y
25°
5.00 in (12.70 cm)
30°
5.50 in (13.97 cm)
35°
6.25 in (15.88 cm)
40°
7.00 in (17.78 cm)
45°
7.50 in (19.05 cm)
50°
7.75 in (19.69 cm)
Power Supply and Wiring
Power Supply
Connect four 55 W or 60 W, 12 V solar modules in series to supply a 48 Vdc power
supply for the 2001-130, Equinox, 508-128, and Eclipse8 electro-mechanical siren
controls.
Connect four 55 W or 60 W, 12 V solar modules in series/parallel to supply a 24 Vdc
power supply for the UV electronic siren controls.
Connect two 110 W, 12V solar modules in series/parallel to supply a 24 Vdc power
supply for the UV electronic siren controls.
Wiring the 48 V Junction Box
To wire the junction box for the 48 V (55 W or 60 W Modules), do the following:
1. Open the module junction box covers.
2. Knock out the appropriate junction box holes in the modules to allow addition of
cable clamps. An additional knockout will be required for the array output wires
leading from the array to the Control Cabinet.
3. Coat module terminals with NO-OX or an equivalent corrosion inhibitor to
prevent corrosion.
4. Cut the three-conductor cable 8-foot length (2.44 m) into three 32-inch
(81.28 cm) sections.
5. Connect the black wires from the three-conductor cable sections as follows:
• Negative (-) terminal of module A to positive (+) terminal of module B
• Negative (-) terminal of module B to positive (+) terminal of module C
• Negative (-) terminal of module C to positive (+) terminal of module D
6. Run one side of the two-conductor PV output cable 30-foot length (9.144 m)
through the cable clamp, to module D junction box. Connect the black wire to the
negative (-) terminal and butt splice the red wire to the red wire from the three-
conductor cable within the junction box. Use wire tie wraps provided to secure
the output cable to the bracket.
