Solar Panel ROI Calculator – Czechia 2026
An 8 kWp system without a battery pays back in Czechia in 6.59 years: the annual saving is CZK 27,650, self-generated electricity costs CZK 1.11/kWh (82% cheaper than the CZK 6.00/kWh grid price), and over the 25-year system lifetime you save CZK 846,070. Enter your own solar system's parameters or use the simple wizard to find out the annual savings, payback period and electricity production in Czechia.
Basic
Rough conversion of your bill to annual consumption using the average electricity price — estimate only.
Recommended size for your consumption: 8 kWp.
Estimate based on an average price of ~CZK 23,800/kWp (materials, installation, VAT) — the actual price depends on the installer, roof and chosen components.
Your result
6.59 years
Payback period
Calculated for system: 8 kWp · no battery
Annual savings
CZK 27,650
Monthly bill before → Monthly bill after
CZK 3,000 → CZK 1,650
Cost of your own kWh
CZK 1.11
grid price: CZK 6.00
Lifetime savings
CZK 846,070
What this means: Your own electricity works out at CZK 1.11/kWh, which is 82% cheaper than the grid price of CZK 6.00/kWh. The system covers roughly 45% of your annual electricity use; you'll still buy the rest from the grid.
| Setup 1 | |
|---|---|
| Calculated for system | 8 kWp · no battery |
| System cost | CZK 190,000 |
| Payback period | 6.59 years |
| Annual savings | CZK 27,650 |
| Lifetime savings | CZK 846,070 |
| Annual production | 7280 kWh |
| CO₂ saved | 2.4 t/year |
| Self-consumption | 37.09 % |
| Annual electricity consumption | 6000 kWh |
Setup 1
- Self-consumption: 2700 kWh (37 %)
- Exported to grid: 4580 kWh (63 %)
This calculation is indicative and is based on the entered inputs and average values for Czechia (specific yield, electricity prices). Actual production and savings depend on the specific roof, orientation, shading and installer. It does not replace a quote from a solar installer.
How solar panel ROI is calculated
Annual production is calculated as the installed capacity (kWp) multiplied by the specific yield (kWh produced per year per 1 kWp) for the given location in Czechia. Part of the electricity produced is used directly by the household (self-consumption), while the rest is exported to the grid at the feed-in tariff.
Annual savings are the sum of two parts: money saved on electricity that would otherwise have been bought (self-consumption × electricity price), and income from surplus exported to the grid (remaining production × feed-in tariff).
The payback period is the year in which cumulative savings exceed the net investment (system and any battery price, minus the subsidy). The calculator also accounts for the annual rise in electricity prices and the gradual degradation of panel output.
The calculator lets you compare 2–3 setups side by side, for example a system without a battery and one with a battery, and immediately see the difference in payback period and total savings.
Frequently asked questions
How many years does it take an 8 kWp solar system to pay back in Czechia?
For an 8 kWp system without a battery and an annual household consumption of 6,000 kWh, the payback period is 6.59 years. The annual saving is CZK 27,650 and the monthly electricity bill drops from CZK 3,000 to CZK 1,650.
How much do I save with an 8 kWp solar system in Czechia per year?
For the default 8 kWp system without a battery, the annual saving is CZK 27,650, and CZK 846,070 over the full 25-year system lifetime.
How much does self-generated kWh cost compared to the grid in Czechia?
Self-generated electricity costs around CZK 1.11/kWh, which is 82% cheaper than the CZK 6.00/kWh bought from the grid (2026 prices).
How is the annual solar production calculated?
Multiply the system size in kWp by the location's specific yield in kWh/kWp/year. In Czechia, the typical figure is around 1000 kWh/kWp/year, varying by region and roof orientation.
What does self-consumption mean and why does it matter?
It's the share of produced electricity you use directly instead of exporting it to the grid. Higher self-consumption means a faster payback, because purchased electricity is more expensive than the feed-in tariff for surplus.
Is battery storage worth it?
A battery increases self-consumption and therefore savings, but also increases the investment. Compare the setup with and without a battery in the calculator – the higher the electricity price and daytime usage, the sooner a battery pays off.
How does the Nová zelená úsporám subsidy affect the payback period?
It reduces the net investment by the subsidy amount, shortening the payback period. It doesn't affect the annual savings. Check the current conditions on the website of the Czech State Environmental Fund (SFŽP).
Why does production decrease over time?
Solar panels gradually lose a small amount of output over time (degradation, typically around 0.5% per year). The calculator accounts for this in the production and savings estimate over the system's full lifetime.
How much CO₂ does a home solar system save?
It depends on annual production and the emissions factor of the Czech electricity grid. The calculator converts the electricity produced into tonnes of CO₂ saved per year based on the current energy mix.
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Last updated: 23 July 2026