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 tariffThe fixed power charge remains in both scenarios. Surplus payment rules and credit caps depend on your country and retailer.
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

Guidance estimate based on latitude, climate band, optimal fixed orientation and standard system losses. It is not an installer quote or an engineering study.

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

Guidance estimate based on latitude, climate band, optimal fixed orientation and standard system losses. It is not an installer quote or an engineering study.

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 →