SolarTotal
solar self-consumption · transparent scenarios

SolarTotal

Estimate solar-system performance anywhere in the world from location, installed power, battery, consumption and total costs.

Worldwide solar calculator for monthly production, self-consumption, surplus, savings and payback, with a chart and practical recommendations.

Try the toolUse cases
No accountLocal processingVisible assumptions

01 · Your inputs

Location, installation and consumption

Edit assumptions and review the result instantly.

°
Enter a latitude from −90° to 90°, or use your device location. Then choose the closest climate band.
Latitude set: 37.89°
kWp
kWh/month
Total energy used during one complete average month, not per day. Find the kWh figure on your electricity bill.
Optional panel details Optional
Wp

The panel details set the installed power to 4.5 kWp.

EUR
kWh
EUR
03
Electricity tariffSavings combine self-use at the purchase price and exports at the sale price. No compensation caps apply. Fixed charges remain; simple payback excludes finance, taxes, maintenance, degradation and replacements. Check the contract and an hourly simulation before deciding.
EUR/kWh
Variable price paid for each kWh imported from the grid.
EUR/kWh
Price or credit received for each kWh exported to the grid.
kW
EUR/kW/month
Monthly fixed price for each contracted kW. Solar panels do not automatically reduce this charge.

The calculation stays in your browser. Your device location is requested only after you press Use my location; no search or coordinates are sent to an external API.

02 · Result

Production, surplus and payback

Local calculation ready

6,976 kWh

Yield is interpolated in an editorial latitude table and multiplied by a climate factor. It does not query PVGIS or weather and does not know your roof shading. Direct use is capped at 42% of monthly consumption; the battery assumes 88% efficiency and a daily limit of 72% of capacity.

6,976 kWhAnnual production
€701Estimated annual savings
9.3 yearsSimple payback
Total investment
€6,500
Estimated bill without solar
€1,101
Estimated bill with solar
€400
Annual fixed power charge
€177
Self-consumed energy
1,764 kWh
Exported surplus
5,212 kWh
Grid import
2,436 kWh
Consumption covered
42%

Show surplus-use recommendations

  • There is enough annual surplus to consider smart daytime charging for an electric vehicle.
  • Use a timer or energy manager to heat domestic water during solar production peaks.
  • Schedule the dishwasher, washing machine, dryer, pool pump or cooling for the strongest solar hours.
  • A battery may shift part of the daytime surplus to the evening; compare its added cost before deciding.

Method

How it works

  1. Resolve the location to latitude and estimate the monthly solar pattern for the selected climate.
  2. Calculate production, self-consumption, surplus, grid import, savings and payback.
  3. Show a monthly chart and suggest practical uses for surplus production.
Understand before deciding →

When to use it

Use cases

  • Prepare questions before requesting quotes.
  • Compare system sizes and battery options.
  • Plan EV charging, water heating and flexible loads during solar hours.
Practical example →

Limits

Sources and scope

Yield is interpolated in an editorial latitude table and multiplied by a climate factor. It does not query PVGIS or weather and does not know your roof shading. Direct use is capped at 42% of monthly consumption; the battery assumes 88% efficiency and a daily limit of 72% of capacity.

Privacy by design

Your data stays on this device

The calculation stays in your browser. Your device location is requested only after you press Use my location; no search or coordinates are sent to an external API.

Privacy →