The Approved List of Models and Manufacturers, and Domestic Content Requirement — the Indian rules governing which modules may be used on which projects.
The additional energy a bifacial module produces from light reflected onto its rear face, expressed as a percentage uplift over an equivalent monofacial array.
Cash available for debt service divided by the debt service due in the same period — the ratio a lender uses to decide whether a solar project is bankable.
The gradual annual loss of module output, typically 0.5-0.7% per year after a higher first-year drop, warranted by manufacturers to 80-87% of nameplate at year 25.
The ratio of installed DC module capacity to AC inverter capacity — deliberately set above 1.0 so the inverter runs near its efficient operating point more of the day.
The lifetime cost of a plant divided by the lifetime energy it produces, both discounted to present value — the only number that lets you compare solar against a grid tariff on equal terms.
A metering arrangement where surplus rooftop generation exported to the grid is netted against imported units, so the meter effectively runs backwards.
The contract fixing the tariff, term, offtake obligation and risk allocation between a generator and a buyer — typically 20-25 years for utility solar.
Actual generation divided by the generation theoretically available from the irradiation that fell on the array — the measure of how much of the available sunlight the plant converted.