Loss chain: multiply or add?

Enter the loss percentages from a yield report. Pick the basis the report uses. Decimal commas and thousands separators such as 176,634 are accepted. Presets are the page's worked example (percentages rounded to 2 decimals).

Energy before losses (kWh a year)

Each percentage is of

Array size (kWp, optional)

Tilted-plane sunlight (kWh/m2, optional)

Stage (loss, %)	Loss %	Energy after (kWh)
Shading
Reflection (IAM)
Soiling
Module temperature
Light-induced degradation
Nameplate rating
Mismatch
DC wiring
Connections
Inverter efficiency
Inverter clipping
Availability
Custom loss 1
Custom loss 2

-Energy to the grid, chained (kWh)

-Total loss, chained (% of start)

-Sum of the stage percentages

-Adding overstates the loss by (points)

-Energy if you added the percentages (kWh)

-Performance ratio (needs kWp and sunlight)