Solar PV calculator for a family home
Enter your monthly bill. The calculator estimates system size, yield, savings, subsidy and payback. The assumptions are visible and you can change them.
Inputs
Total monthly payment including distribution.
Calculation assumptions, you can adjust them
Result
Recommended capacity: 5 kWp. Annual generation: 5,250 kWh. Indicative investment: 6,500 €
With annual consumption of around 5,400 kWh, a 5 kWp system makes sense.
Annual saving
578 €
self-consumption 40 %
Panels carry a 25-year performance warranty and 12 years on the product, the inverter 5 to 10 years depending on the brand. After payback the plant keeps generating.
- Recommended capacity
- 5 kWp
- Annual generation
- 5,250 kWh
- Indicative investment1,300 €/kWp, the quote confirms the price
- 6,500 €
- Zelená domácnostiam subsidy500 €/kW for at most 2 kW, cap 1,000 €, at most 50 % of the investment, SIEA conditions from 21 September 2026
- 1,000 €
- Payback after subsidywith a suitable design usually 8 to 10 years
- 9.5 yrs
Indicative calculation, as of 09/2026. Actual generation depends on roof orientation and pitch, shading and daytime consumption. Payback is not a guarantee.
What you get with the system, warranties and how installation works are on the page Solar PV for a family home. Whether a battery or a virtual battery pays off is compared by the virtual battery calculator.
Questions we get asked
1How does the calculator work out system size?
From your monthly bill and electricity price it estimates annual consumption, divides it by a specific yield of 1,050 kWh per kWp and rounds to half a kWp. The result is the upper limit of a sensible size; the actual design depends on the roof and on daytime consumption.
2Why does self-consumption matter so much?
Electricity used at home saves the full price per kWh; surplus exported to the grid earns only the feed-in price. Without a battery a home typically uses 30 to 45 % of the output, with a battery 60 to 75 %.
3Is the price in the calculator binding?
No. It is an indicative price per kWp derived from typical installations. You receive a binding price with a fixed scope in the quote after a site visit, valid for 30 days.
4How is the subsidy included?
Zelená domácnostiam (the Slovak household PV subsidy scheme) contributes 500 €/kW for at most 2 kW, i.e. at most 1,000 € and at most 50 % of costs (SIEA conditions effective from 21 September 2026). The calculator uses this as a default assumption you can change. We verify the conditions before applying and can file the application on your behalf.
A quote with your numbers
Tell us your consumption, municipality and roof type. Pavol Kaprál will get in touch by the next working day.
Family homes: Ing. Pavol Kaprál
pavol.kapral@energovision.sk
+421 911 700 727