Estimate annual kWh and dollar loss from partial shading on string inverters vs module optimizers.
Share of modules receiving any shade
Portion of each shaded module under shadow
Leave blank to estimate at 1400 kWh/kWp/yr
For payback estimate when optimizers are recommended
Annual production loss
7.1% loss · $66.78/yr · 2 shaded modules
String yield impact
7.1% annual loss
| Production loss | 477kWh/yr |
|---|---|
| Financial loss | $66.78/yr |
| Loss share | 7.1% |
| Direct shading loss | 1.6% |
| Bypass diode loss | 2.1% |
| Mismatch loss | 3.4% |
| Engineering note | Keep as is — shading impact is minor |
Keep as is — Keep as is — shading impact is minor
After a fix, verify string current with our Solar Array Current Calculator
Note: String inverters: bypass diodes trip near 10% cell shading, cutting a substring (~⅓ module) and dragging Vmpp. Optimizers / microinverters limit mismatch to per-module loss. Baseline kWh defaults to 1,400 kWh/kWp/yr when not entered.
Production loss confirmed? Now calculate the full financial payback using our Solar ROI Analysis
Save Report: Download a PDF via JoinMyPDF or add this run to a project for a combined export.
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