Home battery calculator
Electric car use
Choose a car, or enter energy use manually
A selected catalogue car fills its published consumption when available. Otherwise, enter an indicative value yourself.
Annual kilometres are spread evenly across the twelve monthly steps.
The default is an editable estimate; catalogue consumption is used when available.
Share of the car's annual electricity charged at this home.
Home energy system
Default uses the latest GUS household average; detached homes may use more.
PVGIS Warsaw reference: south-facing, 35° tilt, 14% system losses.
Other battery sizes need your own installed-price quote; the 10 kWh examples are not scaled.
Editable share of PV output used immediately, before the battery.
Editable share of household use that can be served by stored energy.
Installed battery cost
Public vendor examples for a 10 kWh system, gross installed: PLN 21,000–35,000; not a national average.
Gross installed cost in PLN.
Gross installed cost in PLN.
Potential PME2 grant
Result
Illustrative monthly model · source data checked 2026-10-19
- Estimated annual savings
- PLN 2,424
- Simple payback range
- 8.7–14.4 years
- Added PV used from battery
- 2,468 kWh
- EV-attributed share of savings
- PLN 1,522
| Month | PV output | PV stored and used | PV exports | Savings |
|---|---|---|---|---|
| January | 165 kWh | 104 kWh | 0 kWh | PLN 137 |
| February | 249 kWh | 174 kWh | 0 kWh | PLN 170 |
| March | 446 kWh | 254 kWh | 102 kWh | PLN 251 |
| April | 595 kWh | 246 kWh | 262 kWh | PLN 262 |
| May | 655 kWh | 254 kWh | 311 kWh | PLN 251 |
| June | 676 kWh | 246 kWh | 343 kWh | PLN 215 |
| July | 666 kWh | 254 kWh | 322 kWh | PLN 226 |
| August | 631 kWh | 254 kWh | 286 kWh | PLN 215 |
| September | 519 kWh | 246 kWh | 185 kWh | PLN 191 |
| October | 357 kWh | 254 kWh | 13 kWh | PLN 203 |
| November | 166 kWh | 105 kWh | 0 kWh | PLN 156 |
| December | 126 kWh | 79 kWh | 0 kWh | PLN 148 |
How to read this estimate
This is a flat-load monthly estimate, not a measured household profile or an optimizer. It assumes one battery cycle per day, 90% round-trip efficiency, PV-first charging and an indicative day-rate value for load served by the battery. The PGE tariff rates are an indicative variable-charge reconstruction; fixed fees and account-specific deposit expiry are excluded.
Smallest modelled capacity reaching 90% of the best annual benefit: 10 kWh.
Estimated household-only annual savings: PLN 902.
Official status checked 2026-10-19: PME2 (nabór trwa od 20.10.2026 do 01.10.2027). The form is available only from 2026-10-20 09:00 Warsaw time.
The published storage component is up to 30% of eligible cost from 2025-11-01, capped at PLN 800/kWh and PLN 16,000 for net-billing or PLN 8,000 for net-metering. A separate EU storage-and-inverter bonus may add up to PLN 2,000; the minimum is 10 kWh and capacity must be at least 2 times PV peak power.
PME1 applications closed 2026-06-19; assessment had reached applications from 2026-10-16. Mój Prąd 6 applications closed 2025-08-29.
No PME2 estimate is shown until the conditions are confirmed and the storage is at least 10 kWh and twice the PV peak power.
The termomodernisation relief may allow an owner or co-owner to deduct up to PLN 53,000 per taxpayer with an active VAT invoice; finish the project within 3 years and exclude grant-refunded costs. It is not subtracted from payback.
Grid-connection reporting depends on battery power and the property's connection capacity. The storage register applies above 50 kW; building and fire duties depend on location and size (outside-building installations up to 30 kWh have no building notice or permit requirement).
Sources checked 2026-10-19; GUS household default is the 2025 figure (1,832.8 kWh/year), replacing the 2024 design value of 1,831.8.
- PME2 official programme rules and status
- Ministry of Finance: termomodernisation relief
- KPK OZE: installation and grid-connection guidance
- European Commission JRC PVGIS monthly yields
- PSE: monthly RCEm values
- PSE: interval RCE API
Source names, check dates and caveats
- Statistics Poland (GUS), Municipal and energy infrastructure in 2024 — 2026-10-19; All-household recipient average; not a detached-home-with-EV average. Superseded by the 2025 publication available on the check date.
- Statistics Poland (GUS), Municipal and energy infrastructure in 2025 — 2026-10-19; All-household recipient average; not a detached-home-with-EV average.
- European Commission JRC PVGIS 5.3 PVcalc — 2026-10-19; Warsaw reference: 1 kWp crystalline silicon, fixed south-facing plane at 35 degrees, 14% system losses; PVGIS-SARAH3/ERA5, 2005-2023, horizon enabled.
- European Commission JRC PVGIS 5.3 seriescalc — 2026-10-19; Last complete year available in PVGIS 5.3 at the check date; used only to weight the offline PSE RCE interval snapshot.
- Polskie Sieci Elektroenergetyczne (PSE), RCEm monthly market price — 2026-10-19; PSE reports these pre-VAT and pre-excise values in PLN/MWh; the October 2025 and February 2026 figures use their latest published corrections.
- Polskie Sieci Elektroenergetyczne (PSE), RCE 15-minute API — 2026-10-19; Offline snapshot for 2025-10-01 through 2026-09-30; weights use the same UTC month, day and hour from PVGIS 2023, matched against PSE period_utc. Negative RCE intervals are floored at zero under the prosumer deposit rule.
- Renewable Energy Sources Act, consolidated text, article 4c — 2026-10-19; Modeled export-credit value; account-specific use and the twelve-month expiry are not simulated.
- Poradnia OZE; assembled from URE-approved PGE 2026 tariffs — 2026-09-13; Existing ownership-energy snapshot, retained with its 2026-09-13 source date. Indicative PGE variable charges including VAT; fixed monthly fees are excluded and other published comparisons may include additional components.
- NFOŚiGW Modernisation Fund storage calculation assumptions — 2026-10-19; The source's 90% efficiency is an illustrative programme average, not a specific battery rating. The calculator follows its declared monthly one-cycle-per-day model and does not apply the programme's 328.5 operating-day adjustment.
- Neptun Energy, 10 kWh storage prices for 2026 — 2026-10-19; Vendor-published example prices, not a national market survey or average; kept editable.
- NEXBE, listed home storage prices for 2026 — 2026-10-19; Vendor listings include exact 10 kWh products and a lower-priced 10.6 kWh example; not a national market survey or average.
- NFOŚiGW, PME2 programme announcement and official programme site — 2026-10-19; On the check date the application window had not opened. The estimate uses the itemized limits, not the separate PLN 19,000 headline cap; eligibility is conditional.
- Official home-storage programme site, PME2 status — 2026-10-19; The programme site uses the quoted status text while also saying the application form becomes available only at opening.
- NFOŚiGW, Mój Prąd 6.0 programme announcement — 2026-10-19; Historical programme status: applications closed on 29 August 2025.
- Official home-storage programme site, PME1 status — 2026-10-19; The assessment progress is dated 16 October 2026 and may have changed.
- Ministry of Finance, termomodernisation relief guidance — 2026-10-19; A possible deduction only; the calculator does not convert it to cash savings.
- Krajowy Punkt Kontaktowy OZE, home storage installation guide — 2026-10-19; Grid-connection reporting can still apply to a small home battery; building duties depend on installation location and capacity.
- Krajowy Punkt Kontaktowy OZE, storage register guidance — 2026-10-19; This threshold applies to installed power, not kWh capacity; grid-connection, building and fire-safety duties are separate.
- EvCompass estimate — 2026-10-19: Default car profile: 15000 km/year, 18 kWh/100 km, 70% home charging. This is an editable default profile; 18 kWh/100 km is used only when no selected car has suitable published consumption data.
- EvCompass estimate — 2026-10-19: Load-shape defaults: 30% of PV used directly, 60% of household use outside PV hours; load is spread evenly across the year, with 1 battery cycle per day. These editable illustrative values are not measured: household load is spread evenly through the year, the battery is limited to one cycle per day, and home EV charging is assumed outside PV hours.
- EvCompass default scenario — 2026-10-19: Default PV reference: 5 kWp at Warsaw. Annual yield comes from the dated PVGIS source; 5 kWp is an editable default.
Compare home charging costs with the home-charging calculator