Solar Panel Installation

Simple in-browser notepad with auto-save. Write quick notes that persist in your browser. Download as text file. No signup needed.

Calculate a transparent solar-array nameplate and energy scenario from entered panel count, peak sun hours, losses, and annual site electricity.

Test a solar cash-payback scenario from entered all-in cost, verified incentives, tariff-aware year-one savings, recurring costs, and horizon.

Estimate appliance kWh and cost by day, week, average month, current calendar month, and year, with an optional regional CO₂ factor.

Calculate an entered utility bill reduction and simple payback, or compare observed bill averages without assuming what caused the change.

Calculate water use from meter readings or measured fixture activity, compare daily averages and estimate variable charges using your actual rate.

Calculate emissions from your activity quantities and documented factors. Record units, sources and boundaries, then save, restore or export.

Reproduce one source-labelled electrical load schedule from connected volt-amperes and explicitly copied line multipliers—without choosing code factors or sizing a service, feeder, conductor or breaker.

Audit one documented protection-selection record from source-labelled current components, an explicit multiplier, an already selected device rating, and a documented conductor ampacity—without choosing a breaker or declaring compliance.

Calculate percentages in seven modes with visible formulas, strict input validation, signed percentage change, and symmetric percentage difference.

Audit voltage-drop arithmetic for one source-selected candidate conductor using documented impedance, path and units—without selecting AWG, ampacity, an allowable drop or code compliance.

Audit one documented series circuit path from source-labelled segment currents, lengths, path multipliers and effective impedances—without assuming copper, choosing wire size or applying a pass/fail threshold.

Convert square meters to square feet. Area conversion for real estate and flooring. Free unit converter with precise, instant browser-based conversions — no