Install Manual

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Document Number: MAN-SFO-15 | SAFETY AND INSTALLATION MANUAL FOR PHOTOVOLTAIC MODULES
IMPORTANT NOTE:
Electrical connection
With an expected gain of power (Pmp) and current
(Isc) from the rear due to signicant light contribu-
tion, i.e from a high albedo background, the user/
designer must consider the electrical performance
of both front and irradiance % on backside for the
following below. It’s suggested at least +20% bifa-
ciality gain.
• Wire and string sizing
• Inverter short-circuit current input limit
• Overcurrent protection device
TIP: With multi rows structure, connect horizontal
series of modules to dierent MPPT to reduce loss-
es due to mismatch on reected light on back side.
requirements between the module and the racking/
rail system, and is listed on UL’s product database. An
example of a UL2703 recognized integrated grounding
method is a WEEB washer which Silfab has found to
be generally compatible with Silfab modules, however
each combination of module/racking system requires
a specic WEEB washer size. It is the responsibility
of the installer to ensure that that the specic size
requirement has been met and is used appropriate-
ly per the manufacturer’s installation manual. Note,
WEEB washers are intended for single-use only; they
must not be reused after removal or loosening. Refer
to Wiley’s installation instructions for the specic use
of WEEB washers.
Other grounding methods may be used in conjunction
with a module mounting system tested to UL2703. For
these installations, the Silfab module and frame style
must be tested and part of the instructions for the list-
ed mounting product. The Silfab module must be in-
stalled in accordance with these instructions as well as
the mounting system’s listed instructions.
As a nal reminder, both Option A and Option B must
be grounded as per NEC Article 250 or CSA C22.1,
whichever may apply to your local jurisdictional and
code requirements.
9.4 Silfab (SIL-XXX XL) Bifacial Modules
Bi-facial modules are able to capture and convert light
from both the front and back surface of the module, as
shown FIGURE 6. As a result, Levelized Cost Of Electrici-
ty (LCOE) can be further reduced with bifacial technolo-
gy through rear-side generation up to 20% annual gain.
This section outlines the fundamental components for
consideration to maximize power output of your bi-fa-
cial PV system.
Step #1: Highest Surface Reectivity/Albedo
• Performances of bifacial PV modules are linearly de-
pendent on the albedo.
• Best results: crushed white rock, bright white paint, or
an ENERGY STAR™ roof.
Step #2: Select the optimum height of installation &
mounting structure
• Elevate the module above as much as possible, as it
will capture more ground-reected light.
• For at ground/rooftop installation it’s recommended
a minimum height of 50-70 cm (19 11/16 – 27 9/16”).
• Avoid shading the back side of the module from the
support rack as much as possible.
Step #3: Tilt angle of modules
• Case-by-case based on site location. For site specic
energy yield analysis and power reports, please contact
Silfab Solar.
Fig. 6: Bifacial solar module