• The solar modules generate electricity when exposed to light. You will need to
wear insulating gloves.
• You will need a multi-meter for volts, amps, resistance and continuity capable of
measuring DC and AC up to 600V and 40A.
• Make sure your tools are insulated.
2 Wiring the solar modules.
• Never step or sit on the glass surface of the solar modules. The glass may break.
• When you install the solar modules on the mount, never allow an output cable to
become caught between the mount and a module frame.
• The solar modules generate electricity when exposed to sunlight, take care not to
short circuit the output cables. The cables can become overheated and their cable
sheaths can melt.
• Ensure the module connectors are fully inserted. There is a risk of malfunction if
they are not pushed in all the way.
• Support output cables so that there is no slack. High winds can blow slack cable
against the mount, damaging the cables.
3 Wiring from solar arrays to the inverter (connector box).
• Follow the provisions of the National Electrical Code.
• For wiring through walls, protect the cables with metal conduits, flexible metal
conduits, or other protection. Failure to do so can result in shock and short circuits.
Always use conduit to protect sections of array output cables that are exposed to
sunlight. For wiring outdoors, protect cables with PVC conduits, metal conduits or
flexible conduits.
• Prevent water from entering or building up in conduit by using waterproof fittings
or duct seal.
• To prevent shock, tape and label the cut ends of array output extension cables (the
side opposite to the connector side) before connecting to solar module output
cables. Further, tape them again after measuring the voltage of each array.
• To prevent shock when you connect the array output cables to the inverter,
remove the tape one cable at a time as you connect the cables.
4 Measuring array output voltage
• See the description of how to measure the output voltage for each array.
• Make sure that all solar modules are exposed to sunlight. (Remove lightproof
sheets, if present.)
• Set the volt meter measurement range to a DC voltage, greater than the expected
measurement (for example 600 VDC).
• Keep the plus (+) solar array output cables away from the ends of the minus (-)
cables. Dangerous arcs can occur. (The array output voltage under normal conditions
(clear skies) can be very high.)
5 Grounding the mount
• To prevent shock, always connect a ground wire from the mounting hardware to
earth.
• Use a minimum #10 AWG ground wire. Run a continuous bond wire to each
