FOR ENGINEERS & RESEARCHERS

The Design Math, Open and Documented

Nine calculators with the formulas stated and assumptions declared — string voltages, cable drop, row spacing, GCR. Every chart exports as a watermarked PNG for design reviews and presentations. No sign-up, no gate, no email.

All Nine CalculatorsOpen Datasets

Engineering Calculators

Each states its method and limits. Where a rule of thumb is used, it says so — and points you to the simulation tool that does it properly.

Charts export as PNG

String Sizer

Temperature-corrected Voc/Vmp against the inverter window

Chart: Voltage vs temperature curve

DC Cable Sizer

Copper cross-section for under 2% voltage drop

Chart: Standard size ladder

Inter-Row Spacing (GCR)

Shadow-free row pitch at winter-solstice noon

Chart: To-scale shadow geometry

Tilt & Azimuth

Optimal angle by latitude, seasonal variants

Chart: Yield sensitivity curve

Inverter DC/AC Ratio

Loading ratio with clipping guidance

Chart: Ratio scale

Energy Yield

kWh from kWp, PSH and performance ratio

Chart: Monthly generation bars

The India Solar Databook

Reference tables the sector keeps re-deriving — published dated, sourced, and CSV-downloadable. Free to cite in papers, tenders, and reports.

All Datasets
State-Wise Solar Resource & Expected Yield36 rows · Updated July 2026Indian & IEC Standards for Solar12 rows · Updated July 2026Rooftop Solar Subsidy & Incentive Rates5 rows · Updated July 2026Module Technology Benchmarks5 rows · Updated July 2026Installed Cost Benchmarks by Segment5 rows · Updated July 2026

Found an Error? Have Better Data?

These tools and datasets are meant to be checked. If an assumption is wrong, a formula is off, or you have better-sourced figures, tell us — corrections are published with credit, and methodology arguments are welcome.

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