Kilowatt – Solar Forecast, Solar ROI Calculator & EV Charging

Kilowatt is the all-in-one solar energy app for homeowners. Monitor your solar panel production, get accurate energy forecasts, calculate your solar ROI and optimize EV charging with solar power.

Solar Energy Tools

Access free solar calculators to estimate your energy production, calculate return on investment and plan your solar installation. Kilowatt supports SolarEdge integration, Tesla Powerwall monitoring and smart EV charging optimization.

Solar Community

Join thousands of solar homeowners across Europe. Explore the solar map to discover installations in your area, compare production data and benchmark your system performance against similar setups.

Kilowatt Features – Solar Monitoring, Forecasts & Smart Charging

Discover all Kilowatt features: real-time solar production monitoring, 7-day energy forecasts, SolarEdge integration, Tesla Powerwall support, EV charging optimization and detailed energy analytics.

Solar Production Monitoring

Track your solar panel output in real time with SolarEdge integration. View daily, weekly and monthly production charts, compare actual vs. forecast performance and receive smart alerts when production drops below expected levels.

Smart EV Charging

Optimize your electric vehicle charging schedule to maximize solar self-consumption. Kilowatt identifies the best charging windows based on your solar forecast, helping you charge with free solar energy instead of expensive grid power.

Solar ROI Calculator

Use this solar ROI calculator to estimate your solar savings, payback period and energy production based on your location and system size.

How Solar ROI is Calculated

Solar ROI depends on electricity price, system size and solar production. The return on investment for solar panels is calculated by comparing the total cost of the system with the cumulative energy savings over its lifetime. Key factors include your local electricity rate, available sunlight hours, panel efficiency and any government incentives or feed-in tariffs.

Solar Panel Payback Period

The payback period is the time it takes for your solar savings to equal the initial investment. In most European countries, solar panels pay for themselves in 5 to 10 years, depending on system size, electricity costs and solar irradiance.

Solar Map – Explore Solar Installations Across Europe

Browse the Kilowatt solar map to discover solar panel installations, compare solar production by region and find solar energy data for your area.

Solar Energy by Region

Solar production varies significantly across Europe. Southern regions like Italy, Spain and Greece benefit from higher solar irradiance, while northern countries can still achieve excellent returns with modern high-efficiency panels.

Solar Production Calculator – Estimate Solar Panel Output

Use this solar production calculator to estimate how much energy your solar panels can generate based on system size, location, orientation and tilt angle.

How Solar Production is Estimated

Solar panel output depends on several factors including geographic location, panel orientation, tilt angle, system size and local climate conditions. Southern European regions typically produce 1,300–1,700 kWh per kWp annually, while northern regions average 800–1,100 kWh per kWp.

Seasonal Solar Production

Solar energy production peaks during summer months with longer daylight hours and higher sun angles. Winter production can be 3–5 times lower than summer, making it important to plan energy usage and storage accordingly.

EV Solar Charging Calculator – Save Money Charging with Solar

Calculate how much you can save by charging your electric vehicle with solar energy. Compare solar charging costs versus grid electricity and optimize your EV charging schedule.

Why Charge Your EV with Solar Energy

Charging an electric vehicle with solar panels can reduce charging costs by up to 70% compared to grid electricity. By timing your charging sessions during peak solar production hours, you maximize the use of free solar energy and minimize grid dependency.

EV Solar Charging Savings

The savings from solar EV charging depend on your vehicle's efficiency (kWh per 100 km), annual mileage, local electricity price and the percentage of charging covered by solar production. A typical household with solar panels can save €500–€1,200 per year on EV charging costs.