Maintenance And Cleaning - Maxeon SPR-P5 UPP Series Safety And Installation Instructions Manual

module installation above ground and has an overall impact on the
rear side irradiance mismatch.
The Rearside mismatch losses are proportional to the albedo, height
of the modules above ground and structure shading factor. The
irradiance non-uniformity on the rearside results in mismatch
generally as the albedo increases and installation height of the
modules are lower to the ground.
5.4 Rooftop Applications for Bifacial modules
Bifacial modules use direct, reflected or diffuse sunlight at the
rearside to generate additional power. Therefore, it is
recommended to use bifacial modules installed on flat roof
applications.
In order to maximize the bifacial gain at the rooftop applications
the following parameters listed below should be considered:
Surface Albedo
•
Roof Integrity
•
• Module Tilt Angle
Module Elevation
•
Structural Backside Shading
•
The bifacial modules can be mounted both landscape or portrait
orientation as shown in Appendix section.
When installing a bifacial module on a roof, ensure that the roof
construction and the structural load calculations of the building are
suitable.
Bifacial gain tends to be most effective with a higher tilt angle.
As the tilt angle and the module elevation from the underlying
surface increases, more reflected light and diffuse light can be
captured by the module.
The mounting rails shall be designed to limit the rear side shading
as much as possible.
5.5 Bifacial Electrical Considerations
The overall electrical bifacial gain is determined by the combination
of surface albedo, irradiance, module tilt angle, shading losses from
the rearside, rearside mismatch and module elevation above
ground. Please refer to the Maxeon datasheet for the electrical
outputs with respect to the overall bifacial gain. Please utilize a
suitable performance software package to simulate the overall
bifacial gain
5.6 Handling of Modules during Installation
Do not place modules face forward in direct contact with abrasive
surfaces like roofs, driveways, wooden pallets, railings, stucco walls,
etc...
The module front surface glass is sensitive to oils and abrasive
surfaces, which may lead to scratches and irregular soiling.
During storage, modules need to be protected from rain or any
kinds of liquids. Required storage temperature is between 10°C to
40°C in a dry environment (humidity between 30 to 80%). Do not
store modules outdoor to avoid moisture and wet conditions.
Modules that feature antireflective coated glass are prone to visible
finger print marks if touched on the front glass surface. Maxeon
recommends handing modules with anti-reflective glass with gloves
(no leather gloves) or limiting touching of the front surface. Any
finger print marks resulting from installation will naturally disappear
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Safety and Installation Instructions - Document 539821 Rev.E
over time or can be reduced by following the washing guidelines in
Section 6.0 below. Any module coverage (colored plastic tarps or
similar) during installation can lead to permanent front glass
discoloration and is not recommended. The use of vacuum lifting
pads can cause permanent marks on the front glass.
Never lift or move the module using the cables or the junction box
under any-circumstances. Ties or tapes used to secure cables are
designed for transportation. They are not designed to comply with
local requirements for securing PV cable to the array, and may
cause shading on bifacial panels reducing performance.
System energization and shutdown procedures need to be followed
based on respective National guidelines and local regulations. Safe
site operational practices must be adhered before energizing the PV
system (e.g. electrical continuity, avoiding direct contact with
electrical/framing equipment, wearing safety PPE, etc.). System
should be electrically disconnected during maintenance, upgrades,
and modification works which can affect the operation of PV
system.
6.0

Maintenance and Cleaning

Trained Maxeon dealer or trained Maxeon support personnel should
inspect all modules annually for safe electrical connections, sound
mechanical connections, and freedom from corrosion.
Periodic cleaning of module glass has resulted in improved
performance levels, especially in regions with low levels of annual
precipitation; therefore Maxeon recommends periodic cleaning of
the modules.
To clean a module, wash its glass surface with potable, non-heated
water. Normal water pressure is more than adequate when cleaning
the AR glass. Maxeon recommends using a large hosepipe and not
to perform cleaning at high outside temperatures. Some
fingerprints, stains, or accumulations of dirt on the glass may be
removed with over-the-counter glass cleaners (such as Windex
equivalent), or a 3% soap-and-water solution. For smaller
with
systems, wet the module glass with the solution, let it stand for five
minutes, and then wet them again and use a soft sponge or
seamless cloth to wipe the glass surface in a circular motion. For
large systems, wet the modules with the cleaning solution, let them
stand for five minutes, and then rinse them with high-pressure
water or a soft sponge. Do not use harsh industrial-strength
cleaning materials such as scouring powder, steel wool, scrapers,
blades, or other sharp instruments to clean the module glass. Use of
such materials will void the product warranty.
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