Site 2.54

Site ID
Nominal Capacity
70 kWp
Average Specific Yield
1263 kWh/kWp
Total Estimated Loss
Possible Gain
4% to 5%
2.23 ₹/Wp, 0 ₹/Wp/a
Expenditure / Energy
1.9 ₹/kWh to 1.7 ₹/kWh


Modules with damaged backsheet found on site. Table structures observed to be bent at corners.It is recommended to (i) assign module labelling, (ii) clean inverter fans and filters more frequently, (iii) replace damaged modules, (iv) establish necessary grounding connections, (v) identify and rectify the inverter issues, (vi) retrofit the mounting structure, and (vii) re-sort and re-string modules. The estimated production boost expected by the retrofitting actions lies between 4.4% and 5.1%.

Image gallery

Main Findings

Cable management: Cable layout with cable racking. Missing string labelling at module end.
Inverter fans and filters are soiled.
Inverter not grounded.
One of the inverters run in derating state, which may limit the system from maximum generation.
Module with isolated cell parts, damaged backsheet, and J-box cover found on site.
Module to module equipotential bonding missing.
Table structure bent at corners.
Modules shaded by LA.
Irradiance sensor and LA found on site.
Modules were not soiled due to frequent rains.
IR analysis reveals hot cells from cracks and isolated cell parts. This may indicate irreversible cell damage.

Impact on Performance

Cell Cracks
The EL image reveals presence of cracks and isolated part. These defects are expected to impact performance and generate hotspots.
Estimated Loss
≈ 6%
Based on the IV curve measurements, the estimated underperformance is 14% for the measured module.
Estimated Loss
≈ 14.2%
Near Shading
According to PVsyst simulation, the near shading losses account to 1.49%.
Estimated Loss
≈ 1.49%
Self Shading
Estimated Loss
≈ 0.56%
Total Estimated Energy Loss
≈ 22.25%

Proposed Solutions

Strings, tables, and inverters should have a suitable labelling (UV-resistant).
Inverter fans and filters shall be cleaned more frequently.
Grounding shall be established in inverter to ensure system and personnel safety.
A root-cause-analysis shall be conducted on the inverter running in derating mode to identify the problem and restore the inverter generation.
Modules with isolated parts, damaged backsheet, and J-box cover shall be replaced as they pose performance and safety threat.
Earthing connections between modules shall be added.
A re-sorting shall be conducted to have lower performing modules in the same string, or at least the same MPPT.
Retrofitting actions shall be done on the structure to fix bent structure corners.
A re-stringing shall be conducted to have shaded modules in one string, or at least the same MPPT.