Solar PV for homes in Slovakia: a practical guide

1 Is your home suitable for solar?

Three major factors are roof direction, shading and when you use electricity. South-facing roofs generate the most in these models. East or west produces roughly a fifth less in the PVGIS comparison, but can still be useful and shifts more generation towards morning or evening. PVGIS

PVGIS 5.3, 35° tilt, 14% losses, city-centre positions and long-term 2005–2023 weather. The model excludes nearby chimney, building and tree shadows. With panels on both east and west roofs, array capacity is divided between the two. PVGIS

Beyond orientation, assess the condition and structural capacity of the roof. SKSI explains that structure, wind and snow loading, fire safety and electrical design require separate assessment; panel weight alone is insufficient. SKSI If the roof needs replacement in a few years, address that before installing panels.

Finally, consider consumption timing: the annual bill total is not enough. When electricity is used matters, as SIEA also recommends. SIEA guide A household cooking, washing or heating water during the day can use more rooftop generation directly than one whose demand starts mainly in the evening.

For a flat, cabin or business, see the guides to balcony solar · solar for cabins · business solar.

Read more: Is your roof suitable for solar?Panel orientation and tilt

2 Which system and power should you choose?

Three broad configurations are relevant:

• Grid-connected without a battery (on-grid). The simplest and least costly arrangement; unused production goes to the grid under the agreed conditions.
• A system with a battery (hybrid). A suitable inverter coordinates panels and storage so some daytime generation can be used later. Certain inverters can add a supported battery later.
• An independent system (off-grid) without a grid connection. Usually more relevant to a cabin without a connection than a standard connected home.

Our hourly PVGIS reference calculation for Bratislava illustrates demand timing: 5 kWp and annual household use of 6,000 kWh. Without storage, it covered 56% of demand in the daytime-heavy profile and 24% in the evening-heavy profile. A 10 kWh usable battery raised coverage to 77% and 67%, respectively. PVGIS These profiles are assumptions rather than measured households. They illustrate a principle, not your savings.

Choose array power from demand, roof space and intended uses such as hot water, a heat pump or an electric car. The grant supports at most 2 kW, but that is a support cap rather than a recommended installation size. Support conditions The distributor decides the permitted connection and export for the actual property; see step 4.

Read more: Grid-connected solar without a batterySolar with storage and hybrid systemsSolar batteries: capacity and selectionSolar invertersChoosing solar panelsLiFePO4 batteriesOff-grid solarChoosing solar system power

3 Solar cost and household support

A precise price depends on the roof, cable lengths, switchboard condition and scope. For context, these are public installed-system offers checked on 21 October 2026:

These are seven configurations from three sellers, not a market average or endorsement. Scope varies: Energovision lists design, inspection and connection administration, while EnergyInvest addresses those items in an individual offer. Nominal storage capacity is different from usable capacity.

Zelená domácnostiam II support

From 21 October 2026 the new Zelená domácnostiam II conditions apply. PV receives €500 for each kW of supported power, counting at most 2 kW, giving a maximum of €1,000and no more than half of eligible expenditure. With the bonus conditions met, the rate is €575 per kW, up to €1,150. Support conditions Support rates

• Application registration opens on 26 October 2026 at 13:00 Slovak timeand reservation requests on 2 November 2026 at 13:00 Slovak time. Old applications are not transferred. SIEA
• After reservation confirmation, you have 45 calendar days for installation and a complete application; the deadline cannot be extended. SIEA
• You pay the full amount first; support follows installation, payment and approval. Panels and inverter must be on the eligible-equipment lists. Frequently asked questions SIEA inverter list

One unresolved point: the programme's equipment page still mentions systems up to 10.8 kW, while the new conditions do not contain that figure. Supported equipment Zelená solidarita for lower-income households has not activated new applications since 15 September 2026. A reopening date and revised conditions had not been found at the source-check date. Zelená solidarita SIEA decides support eligibility, rather than the seller.

Read more: Installed solar costs: all examplesSolar grants: conditions and applicationSolar calculatorIs solar worth it? Payback

4 Buying, installation and grid connection

Request several offers and compare the included scope. Ask about design, electrical inspection, the connection application, meter work, monitoring, exact equipment and usable battery capacity. For support, check programme eligibility and the ability to complete installation within 45 days of reservation confirmation.

Grid connection is handled by your distribution company, the regional network operator: ZSD in western, SSD in central and VSD in eastern Slovakia. This is distinct from your electricity supplier. Each has its own procedure:

• ZSD and SSD state that a draft agreement is sent within 10 working days of application; SSD requests a single-line diagram. ZSD SSD
• VSD accepts applications through eVSD and issues a statement within 10 working days of a complete application; the statement is valid for six months. VSD
• After installation come inspection, metering changes and the connection steps. Do not operate the system until the distributor confirms the connection.

A small-source connection being free does not mean export is unlimited. The distributor can set a low or zero export limit. All three published charges for exceeding agreed reserved capacity, MRK, from 1 January 2026. ÚRSO Building rules, distribution approval and grant conditions are separate matters requiring separate checks.

Read more: Solar installation step by stepComparing solar quotesChoosing a solar installerConnecting solar to the gridPermissions and legislation

5 Operating solar after installation

Existing owners face different questions from first-time buyers. Here are common tasks and where to start:

Producing less than expected?

Compare production with a model for the location and orientation rather than a summer maximum. Review the inverter or application regularly; a sudden drop without a weather change can indicate a fault. Investigating low production.

Lower winter production

This is expected. The Bratislava PVGIS model for 5 kWp gives about 195 kWh in December and 726 kWh in July. PVGIS Solar in winter.

What should you do with surplus?

Useful household consumption can replace imports: water heating, laundry and daytime car charging. Supplier virtual-battery services are another option; the cited examples list VSE at €3–€24 per month by volume and SPP at €3 per month VSE price list SPP price list. Other options include export sale or sharing with other consumption points through OKTE. OKTE Using surplus electricity. Electricity sharing.

Adding a battery?

Check support for the exact inverter/battery combination and the distributor's requirements. An inverter's SIEA listing concerns the support programme's lifetime requirement rather than distribution approval. SIEA inverter list Adding a battery.

Maintenance and inspection

Monitoring generation does not replace a professional check of electrical protection. Applicable electrical inspections must be carried out by an authorised inspector. SKSI Solar maintenance. Electrical inspections.

Read more: Solar monitoringDoes solar work during an outage?Virtual batteries

When solar may not pay

Solar is not a good investment for every home. Be cautious, or address the underlying problem first, in these situations:

• The roof is shaded much of the day or faces north. An unshaded-roof estimate will not describe its lower actual output.
• Very little electricity is used during the day and the plan depends on selling surplus. Export can be worth much less than imports cost. For example, the cited ZSE Flexi price for working days from 10:00 to 18:00 is €0.036/kWh excluding VAT, ZSE price list while the cited SPP variable import price is €0.16–€0.21/kWh including VAT, depending on region and entitlement to energy support. SPP price list
• The roof will need replacement soon. Removing and reinstalling panels adds costs.
• Buying storage for savingsdespite mainly daytime demand. In our example at assumed import/export prices of €0.18/€0.04 per kWh, the 10 kWh battery's annual benefit was roughly half as large for daytime-heavy demand as for evening-heavy demand. PVGIS
• The budget depends on a grantthat has not been confirmed. Reservations have ordering and deadlines, and payment follows installation.

PV does not remove fixed monthly electricity charges or distribution charges for energy still imported. Calculate payback from your bill and an actual offer rather than an advertised maximum saving. Calculating payback.

Fotovoltika or fotovoltaika?

Both Slovak words refer to the same technology and are used in practice. The Ľudovít Štúr Institute of Linguistics recommends fotovoltika and fotovoltickýas forms consistent with Slovak word formation; fotovoltaika follows the English word photovoltaics. JÚĽŠ SAV This site therefore uses fotovoltika. Also distinguish electricity-generating PV from solar thermal collectors that heat water. SIEA guide More on Slovak terminology.

Frequently asked questions