21
Power Supply and Wiring
Installation Manual
6. Measure the voltage between red (+) and black (-) wires at the end of the PV
output cable with the modules exposed to sunlight. If the wiring is correct, the
voltage measures between 30 and 46 Volts. If the voltage is not in this range,
check the wire connections to ensure all steps were followed.
7. Close junction box covers.
8. Run the three-conductor PV output cable (60-foot length) down the pole to the
Control Cabinet. Use wire tie wraps provided to secure the output cable. Form
a drip loop where the cable enters the Control Cabinet. Run cable through the
½-inch NPT aluminum cord grip provided and connect to solar regulator using
the spade terminals. Check the wire connections are made per diagram “Figure 19
Hawaii UltraVoice Wiring Diagram” on page 32.
9. Installation is now complete.
Wiring the Junction Box for 24 V (110 W Modules, four-wire)
To wire the junction box for the 24 V (110 W modules, four-wire Hawaii), 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. Run the wires 60-foot length (18.288 m) for top mount or 30-foot (9.144 m)
for side mount, with an additional 3-foot length (91.44 cm) through the cable
clamp, to module B junction box. Connect the shorter wires to the positive (+)
and negative (-) terminals of module B. Run the longer wires out and connect to
terminals of module A. Use wire tie wraps provided to secure the output cable to
the bracket.
5. Measure the voltage between the two sets of red (+) and black (-) wires at the
end of the PV output wires with the modules exposed to sunlight. If the wiring
is correct, the voltage on each set of wires measures between 15 and 23 Volts.
With a jumper installed on terminal blocks in the UV Control Cabinet, the series
combination of the two modules measures between 30 and 46 Vdc. If either of
these voltage values is not obtained, check the wire connections are made per
diagram “Figure 19 Hawaii UltraVoice Wiring Diagram” on page 32.
6. Close junction box covers.
7. Run the wires down the pole to the Control Cabinet. Use wire tie wraps provided
to secure the output cable. Form a drip loop where the cable enters the Control
Cabinet. Run cable through the ½-inch NPT aluminum cord grip provided and
connect to solar regulator using the spade terminals.
