Before selecting the installer for setting up a solar PV system, it is important to check the following from the proposals submitted by the installer.
- Minimum generation guarantee:
The solar PV system generates electricity and must be warranted by a minimum generation guarantee. The minimum generation depends on a number of factors including the location, design orientation etc. and should be provided by the installer during feasibility analysis.
The consumer should compare the minimum generation guarantee and the compensation rate offered by the installer.
- Warranty period:
There are two types of warranty period for rooftop solar:
System warranty – This is the warranty provided by the installer on the service life of the whole system. The warranty period should be a minimum of 5 years.
Equipment warranty – This is the warranty provided by the manufacturer on the various equipment of the system, such as cables, modules, and inverters among others.
The consumer should compare the system and equipment warranty provided by the installers.
- Maintenance of the system:
The performance of the system depends on its proper maintenance.
The consumer has to check and compare the following –
a) The frequency of preventive maintenance activities like cleaning, checks, etc.
b) The time required for attending any faults.
- Installation as per standards: The consumer should check if the installer is installing the system as per the MNRE/ required standards.
For subsidized projects, the installer is required to seek approval from SNA/ DISCOM before each installation and thus the consumer can be assured of the compliance of the minimum standards.
For non-subsidized projects, the consumer is requested to either ask the installer for data-sheets for self-assessment or conduct a third party inspection at her/his own cost.
- Modification on the rooftop:
The installer will either install the system by grouting/ drilling on the rooftop or use a heavy anchor (non- penetrating).
The consumer should discuss the above with the installer as per her/his requirement.