Solar Production Loss Budget Calculator — Build a PV Energy Loss Budget
Create a transparent annual production-loss budget across common PV loss categories, then see how much energy remains after the selected losses are applied sequentially.
Production basis and loss assumptions
Why a solar production loss budget is useful
A PV energy estimate can look precise while hiding several separate loss mechanisms. A loss budget makes those assumptions visible so project teams can challenge, improve or replace individual values.
Why losses are applied sequentially
If shading removes 3% of energy and soiling removes another 2%, the second 2% applies to the energy remaining after the first loss in this model. That avoids simply adding percentages and accidentally treating each loss as acting on the original gross production.
Common categories
Clipping, shading, soiling, temperature, mismatch, wiring and downtime can all be useful planning categories. The correct categories depend on the project and the purpose of the forecast.
Why this is better than one blanket loss percentage
A single derating number hides where uncertainty comes from. A categorized budget lets you ask targeted questions: Is clipping too high? Is soiling based on measured data? Is downtime realistic? Is shading already accounted for elsewhere?
Frequently asked questions
Should loss percentages simply be added?
Not when they are intended as independent sequential reductions. Addition is only an approximation and can materially overstate total losses.
Can a loss be zero?
Yes. A zero entry leaves the remaining energy unchanged for that category.
Is this a bankable energy model?
No. It is a transparent planning framework. Detailed project forecasting may require site-specific simulation, measured data and engineering assumptions.