UL-62108:2017 pdf free download – STANDARD FOR SAFETY Concentrator Photovoltaic (CPV) Modules and Assemblies一Design Qualification and Type Approval.
9 Modifications
Any changes in design, materials, components, or processing of the modules and assemblies may require a repetition of some or all of the qualification tests to maintain type approval, as described in Annex B. Manufacturers shall report to and discuss with the certifying body and testing agency every change they made.
10 Test procedures
10.1 Visual inspection
10.1.1 General
This procedure provides the requirements for obtaining baseline, intermediate, and final visual inspections to identify and determine any physical changes or defects in module or assembly construction at the beginning and after the completion of each required test.
Any hardware showing initial damage not due to the manufacturing process should be rejected if it may worsen and lead to failure during the subsequent environmental tests. A new module or assembly may then be substituted before beginning the test sequence.
10.1.2 Procedure
All test samples shall be thoroughly inspected and photographed when necessary. All defects or abnormalities (including initial defects related to the quality of solder joints such as inadequate or excessive solder, solder balls, bent interconnects, or misalignment of parts) shall be documented with appropriate sketches or photographs to show the locations of the defects. Components, such as the lens, mirror, secondary optical elements, heat spreaders, and encapsulants, shall also be inspected for defects. Specifically, inspect for:
a) Bubbles, delamination, or any kind of similar defect on the cell and around its edges.
b) Damage incurred during shipping and handling, such as cracked lenses, cracked or bent housings, and bent terminals or mounting brackets.
c) Integrity of the seal around the lens and housing joints. Any crack or gap in sealant materials shall be noted.
d) Any ventilation hole or breather shall not be clogged.
e) Provision for grounding all accessible conductive parts.
f) Broken, cracked, bent, misaligned, or torn external surfaces.
g) Faulty interconnections or joints.
h) Visible corrosion of output connections, interconnections, and bus bars.
i) Failure of adhesive bonds.
j) Tacky surfaces of plastic materials.
k) Faulty terminations, or exposed live electrical parts.
) Any other conditions that may affect reliability or performance.
10.1.3 Major visual defects
For the purpose of design qulification and type approval, the fllowing are considered to be major visual
defects:
a) Broken, cracked, bent, misaligned, or torm external surfaces, including lens, mirror, receiver body,
frame, and junction box.
b) Broken or cracked cells.
c) Bubbles or delamination forming a continuous path between any part of the electrical circuit and the
edge of the receiver.
d) Visible corrosion of any of the active circuity of the sample.
e) Adhesive or sealant failures.
f) Loss of mechanical integrity, to the extent that the installation and/or operation of the modules or assemblies would be impaired.
10.1.4 Requirements
No major visual defects.
10.2 Electrical performance measurement
10.2.1 Purpose
The purpose of the electrical performance test is to identify electrical performance degradation of test samples caused by required tests. The focus of this test is on the power degradation, not on the absolute power output, which will be covered by a separate power and energy rating standard.
Repeatability of the measurement is the most important factor for this test.