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FOR SA F E INSTAL L ATIO N WO Rk
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 V
•
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.)
POINTS TO CHECk WHEN SELECTINg THE INSTALL ATION LOC ATION
•
Check the following items before starting installation work.
•
Refer to the inverter installation manual for more information about inverter installation and electrical work.
.1 CONdITION OF HOuSE WHERE SOLAR POWER SySTEM IS TO bE INSTALLEd
INSPECTION OF ROOF STRuCTuRE
It is important to inspect the structural integrity of the
roof and the durability of the roof materials. The SRS
mounting system and solar modules require a strong base
for durable and reliable operation in local environments.
Always wear a safety harness when working on the roof.
Inspect the roof surface in the area of the installation for
cracks, water leakage, and roofing material quality and
uniformity. This is especially important if the roof is older
than 10 years.
Inspect the roof for sags and other abnormalities. A sag
or deep depression in the roof may indicate a structural
weakness in the support system that may require
correction. The following illustrations detail typical roof
construction as well as old roof problems.
).
DC
5 grounding the mount
•
To prevent shock, always connect a ground wire
from the SRS mounting system to earth.
•
Use a minimum #10 AWG ground wire.
•
Follow NEC 690 grounding provisions.
INSPECTION OF THE ROOF SuPPORT SySTEM
This may require access to the attic.
Check that all rafters, trusses and other materials are in
good condition.
Check for indication of previous water leaks.
Measure the spacing of the rafters or trusses to confirm
the dimensions and prepare for the system layout.
Determine the location of the electrical roof penetration
and wire run, if wiring is planned for this area.
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