calculate for free
Discover in 4 steps your roof's energy output, your savings and your payback time.
From consultation to installation
Simple, transparent, and worry-free.
Free & no obligation
Optimized for any location in Serbia for the most cost-effective result
Estimate of electricity production and amortization
Suitable for all buildings
Free & no obligation
Optimized for any location in Serbia for the most cost-effective result
Estimate of electricity production and amortization
Suitable for all buildings
What you will receive
Our non-binding indicative estimate includes the most important information about:
Why FreeState?
Experience since 2008
Our team has been planning and installing solar systems in Switzerland since 2008, and now in Serbia.
Local presence
Roof survey, installation and service across Serbia
Comprehensive service
Consultation, design, installation & maintenance
Net metering
Surplus electricity offsets your bill in the following months (EDS request by 31 December 2026)
More of your own power, a lower bill
Smart energy management connects your solar system, storage, heat pump and electric vehicle and optimises your self-consumption.
FAQ about the solar calculator
It analyzes location, roof orientation, area and slope and gives you a realistic assessment of electricity production, self-consumption and amortization. Production is based on PVGIS data for your location and savings on the current EPS tariff.
Yes, our solar calculator is completely free to use. You receive a non-binding indicative estimate with no registration required.
You will receive your personalized indicative estimate within minutes of completing the 4-step process in the solar calculator.
No. Household subsidies are awarded through public calls by municipalities and cities, each with its own conditions and deadlines, so we do not deduct them from the price. The 2025 calls covered up to 50% of the investment for a single measure, at most RSD 440,000, and up to 65% for a package of measures, at most RSD 572,000.
You mark your roof on a satellite image. Our calculator then analyzes your specific roof orientation, slope, and area to determine the optimal setup for your building.