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Everyday Solar Calculator

Instantly calculate your solar system’s daily production, savings and usage offset – free and instant.

  • Free
  • No sign-up
  • Instant results

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How to use it

  1. Enter system size in kW, peak sun hours, efficiency ratio, electricity rate and daily consumption.
  2. Click calculate to see daily, monthly and annual production and savings.
  3. Review the percentages and dollar values to decide if solar fits your budget.

The Everyday Solar Calculator turns the numbers you already know—system size, sun hours, efficiency, rate and consumption—into clear, actionable results. It shows how many kilowatt‑hours your panels will generate each day, month and year, then translates that into dollar savings and the percentage of your daily load that will be covered. Seeing a $2.34 daily saving or a 60 % usage offset lets you decide if a roof‑top system makes financial sense. Results update instantly, so you can compare sizes or rates on the fly. Use the example below to verify the tool matches real‑world expectations. The calculator applies a 0.80 derate factor, reflecting temperature, inverter and wiring losses, and uses the standard 365/12‑day month to keep monthly totals realistic. By entering your local electricity rate you instantly see how quickly a system can pay for itself. Adjust any input to model different roof orientations or future rate hikes, and watch the savings curve shift.

Pro tips

  • Round inputs to one decimal place for quicker comparisons.
  • Include a small waste allowance (5‑10%) when sizing to cover shading.
  • Enter your highest electricity rate to see maximum possible savings.
  • Double‑check that your daily consumption reflects all major appliances.

Real-life examples

  • A homeowner wants to know if a 6 kW rooftop system will cover most of their electric bill.
  • A small business evaluates solar ROI before committing to a lease agreement.
  • A real‑estate investor compares solar potential across multiple properties.

Case study

Homeowner Maya entered a 5 kW system, 5 h/day sun, 0.90 efficiency, $0.13/kWh rate and 30 kWh daily use. The calculator showed 18 kWh daily production, $2.34 daily savings and a 60 % usage offset, convincing her to install panels that will save about $850 per year.

Frequently asked questions

How is daily solar production calculated?
It multiplies system size, peak sun hours, efficiency ratio and a 0.80 derate factor to reflect real‑world losses.
Why does the calculator use 365/12 days for a month?
That average keeps monthly production realistic across the year.
Can I use this calculator for a battery‑plus‑solar setup?
Yes, but you’ll need to add the battery’s discharge efficiency manually to the results.
What electricity rate should I enter?
Use the rate you pay per kWh on your most recent bill for the most accurate savings.
Does orientation affect the results?
Orientation changes the effective peak sun hours; adjust that input to model different roof angles.