Drainage Holes - Panasonic EverVolt EVPV Series General Installation Manual

DRAINAGE HOLES

• In each corner of the EverVolt
module frame small drainage
holes are spaced 2.2 in (55 mm)
from the corner on long and
short sides (Figure 22). These
allow humidity caused by rain,
condensation, snow melt, cleaning
or any other process to exit the
frame easily and minimize damage.
• These holes must not be used for
mounting the module, and they
must not be covered by any part of
the mounting structure. To enable
effective drainage and ensure there
is no damage to the module, the
drainage holes must remain fully
open and enable water egress
during and after installation.
• The shape and dimensions of the
drainage holes may vary depending
on product and/or frame design.
EARTH GROUND WIRING
• A module with exposed conductive
parts is considered to be in
compliance with UL 61730 only
when it is electrically grounded in
accordance with the instructions
presented below and the
requirements of the National
Electrical Code.
• When grounding a module, it
must be done using an electrical
Grounding holes
Figure 22. Drainage and grounding holes
General Installation Manual
connection from the module frame.
Local regulations may require
grounding of the modules.
• EverVolt modules have a small
round grounding hole positioned
near each corner of the module on
both the long side and the short
side, as shown in Figure 22 and
can be further identified by the
grounding symbol stamped in the
frame next to it.
• Check all applicable requirements
before beginning installation:
- Suitable grounding lugs must be
used: Listed (KDER) ILSCO, GBL-
4DBT (tin plated) (E34440)
-Grounding cable size should be
between 4 - 14 AWG (2.1 mm² -
21.2 mm²)
-Attach grounds to the grounding
holes in the module frames,
-Fix lug to the frame using a star
washer and lock nut, ensuring a
conductive connection
-Follow the grounding device
manufacturer's installation
instructions to ensure a safe and
conductive connection, including
any supplementary hardware, e.g.,
star washer, and tighten according
to recommended torque.
Drainage holes
GR
• Length of bolt should be carefully
selected in order to avoid
contacting the back-sheet of the
module.
• Great care should be exercised to
ensure that corrosion caused by
the grounding means be avoided.
• Corrosion can increase the
resistance of the grounding
connection on the module, or
can even cause the grounding
connection to fail entirely.
Corrosion can be caused by the
effects of weather, humidity, dirt
and so on. It can also be caused
when two dissimilar metals are in
contact (galvanic reaction).
• To avoid galvanic corrosion,
galvanized or hot dipped zinc plated
fasteners are preferred, however
stainless steel fastening materials
are equally suitable.
• We recommend installing a
lightning rod and SPD (Surge
protection device) to reduce
damage or breakdown to the PV
module caused by lightning.
• The support bars across the rear
of EverVolt modules are connected
to the frame via specially designed
grounding clips and do not need to
be individually grounded.
• Negative grounding of the modules
is not required for EverVolt module.
Cross section
Type
[AWG]
4-6 Stranded
8 Stranded
10-14 Stranded/Solid
Figure 23. Grounding lug dimensions and fastening torque
Torque [ft-lb]
2.9
2.1
2.3
21