Site IV.5

Health
COD
2014
Nominal Capacity
80 kWp
Yield since COD
1046 kWh/kWp
Possible Gain
10% to 15%
CAPEX, OPEX
1.1 ₹/Wp, 0.2 ₹/Wp/a

Abstract

The PV plant is affected by near shadings caused by antennas and lightning rods. Furthermore, the modules show heavy contamination from cement and some poorly produced cells. It is recommended to (i) carry out a deep cleaning of heavily contaminated modules, (ii) replace the roof structures which cause shading on the system, (iii) replace modules exceeding the manufacturer’s guaranteed performance drop and (iv) replace modules with defective J-boxes. The estimated production boost caused by the retrofitting actions lies between 10-15%.

Image gallery

Main Findings

Cable ties broke, hence the module cables and connectors were loosely hanging.
In some modules, the individual cells fall out of order.
Several modules have scratches in the front glass.
The modules present different types of J- box failure types, e.g., overheated, open or missing lid.
The cables of the irradiation sensor are not installed correctly.
The cable ducts are brittle and some are broken.
The combiner box is not attached correctly.
Some modules are contaminated with cement residues that create hot spots.
Poorly produced cells were found in some modules.

Impact on Performance

Soiling

Soiling losses were determined based on the measurements on-site to be 6.9%, on average.

Estimated Loss
≈ 6.9%
Near Shading

Several roof structures cause local shading on the system.

Estimated Loss
≈ 2.6%
Total Estimated Energy Loss
≈ 9.5%

Proposed Solutions

Modules with manufacturing defects (i.e., delamination) shall be replaced.
Modules with any defect on the J-box should be immediate replaced (safety, operation and reliability issues).
The modules contaminated by cement should be cleaned.
All of the DC cabling, including the combiner box, should be maintained for proper attachment.
PV modules showing power drops above the warranty conditions should be replaced. If the replacement is not possible, the modules should be regrouped in power classes within the same string and assigned to individual MPPT.
The roof structures that shade the system should be moved.