How to Estimate Solar Panel Output
When this applies
Use this guide for early PV screening when you need an order-of-magnitude kWh estimate and explicit loss assumptions before vendor curves or full shading models.
Tool to use
Browser-based preliminary check for Solar Panel Output Estimator — fast estimates, not code or stamped design output.
Open Solar Panel Output Estimator →Steps
- 1Start from module nameplate DC power and expected peak irradiance at the site.
- 2Apply temperature, mismatch, soiling, and inverter efficiency derates you can defend in a note.
- 3Convert DC energy to AC using inverter efficiency and clipping assumptions if relevant.
- 4Compare seasonal tilt or tracking differences only after the baseline fixed-array estimate is clear.
- 5Escalate to hourly simulation when shading trees, roof obstructions, or complex tariffs dominate.
Examples
- Residential roof screening before requesting installer quotes.
- Off-grid array sizing next to a load profile estimate.
What to avoid
- Using STC nameplate power without temperature derate in hot climates.
- Confusing DC array output with usable AC energy at the meter.
- Ignoring inverter clipping on small batteries or strict export limits.
Related tools
On the blog
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Browse all task guides or see the full list on the Engineering hub.
FAQ
Does this replace PVsyst?
No. It frames transparent assumptions for quick decisions, not bankable production reports.
Can I use PSH only?
Yes for first-pass checks, but document the PSH definition and seasonality you used.