Solar losses explained: why panel capacity is not delivered energy
See how heat, wiring, inverter conversion, shade and downtime reduce usable solar output.
Panel nameplate capacity is measured under a reference test condition. Delivered energy changes with solar resource, temperature, orientation, shade, wiring, inverter conversion, clipping, soiling and downtime. Treating every kW of panel capacity as a fixed number of billable units overstates certainty.
Use one combined loss assumption carefully
ToolMitra keeps combined system loss visible rather than hiding it inside a result. NREL PVWatts documents system losses and location-specific modelling choices; use it or a qualified designer when the project depends on a production estimate.
Connect loss to the decision
Change loss in the generation calculator, then carry the conservative result into the solar economics calculator. A small annual production change can materially alter NPV when it is repeated across years.
Put the idea into numbers.
Open the solar cost, savings and payback calculator →