Yield Assessment Calculator

Calculate P50 and P90 annual energy yield estimates with uncertainty analysis for PV project financing.

Input Parameters

Results

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P50 Yield
MWh
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P75 Yield
MWh
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P90 Yield
MWh
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Combined Uncertainty
%
Note: P90 yield is used by lenders for debt sizing. Typical combined uncertainty is 6-10%. Multiple independent resource datasets reduce uncertainty. P90/P50 ratio is typically 0.88-0.94.

Reference

Combined σ = √(σ_interann² + σ_model² + σ_resource²) P75 = P50 × (1 − 0.674 × σ/100) P90 = P50 × (1 − 1.282 × σ/100) z-scores: P75=0.674, P90=1.282, P99=2.326 Assumes normal distribution of annual yield