Solar savings calculator
Enter your town, roof and consumption — get system size, PVGIS-based yearly production, savings, the Borzen subsidy and payback, with or without a battery.
Indicative estimate. Production: PVGIS (EU JRC) for the chosen town, pitch and orientation, 14% losses. Subsidy per Borzen call JP-SO-02 (up to €250/kW without or €675/kW with a battery, max. 25% or 40% of eligible costs; paid after installation). We prepare an exact quote after a site visit.
How we calculate your system
Production uses PVGIS data from the EU Joint Research Centre for 16 Slovenian towns, adjusted for roof pitch and orientation with 14% system losses. A south-facing roof at 30–35° in Slovenia produces roughly 1,100–1,340 kWh per kWp a year.
Size follows your consumption: without annual netting, oversizing does not pay, so we aim for about 90% of yearly use. If you enter your roof area, we respect that limit too.
Savings combine the energy you use yourself (at the price you enter) and surplus sold to your supplier. Without a battery a household uses a smaller share directly; a battery moves daytime surplus into the evening.
Subsidy follows Borzen call JP-SO-02: up to €250 per kW without a battery (max. 25% of eligible costs) or up to €675 per kW with a battery (max. 40%). You apply after installation.
What people ask most
Does solar still pay off after the end of net metering?
Yes, but the value now comes mainly from using the power yourself. New systems since 2024 no longer get annual netting: surplus is sold to your supplier at the contract price and the network charge applies to all energy you draw from the grid. That makes correct sizing important, and often a battery that moves daytime surplus into the evening.
Which subsidies are available in 2026?
Grants for households are run by Borzen (call JP-SO-02): up to €250 per kW without a battery (max. 25% of eligible costs) or up to €675 per kW with a battery (max. 40%), with at least 0.7 kWh of storage per kW. You apply after installation at novasamooskrba.borzen.si. Eko sklad offers a low-interest loan. Check that the call is still open before ordering.
What system size fits my house?
In Slovenia, 1 kWp on a south-facing roof produces roughly 1,100–1,340 kWh a year (PVGIS data), depending on location. A household using 5,000 kWh therefore usually needs around 4–4.5 kWp, or 9–10 panels. Without net metering, oversizing does not pay — the calculator sizes the system for your town, roof and use.
How much does a solar system cost in 2026?
Typical 2026 turnkey prices including VAT are roughly €8,800–11,300 for 5 kWp and €15,000–16,900 for 10 kWp. The price per kWp falls with size. A battery, a complex roof or a connection upgrade raise the price; the subsidy lowers it.
Do I need a battery?
Not necessarily, but it often pays. Without a battery a household uses roughly a third of its production directly; with one, considerably more. Because the subsidy with a battery is much higher (€675 instead of €250 per kW), the price gap is smaller than it looks. The calculator compares both options side by side.
What do I need to connect a system?
A grid connection approval from your distribution company (Elektro), installation by a registered electrician and a contract with your supplier for selling surplus. We help with the paperwork and the subsidy application.