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Profitability calculator: PV + battery storage

Estimate the payback on battery storage paired with PV, including grants and thermal modernisation tax relief. Move the sliders to update results immediately. Cost and payback are shown as ranges because the price depends on the configuration and margin.
6 000 kWh
8 kWp
10 kWh

Enter the rates quoted for your installation. The calculator does not determine VAT rates or deductibility. Gross cost includes the specified VAT; a business reclaiming VAT requires a separate tax assessment.

The 85% efficiency and 250 cycles are editable scenario assumptions. Enter additional arbitrage income after costs and losses, excluding savings already included in self-consumption. The annual model does not verify power availability or compatibility with hourly operation.

Estimated investment cost…
The range reflects the platform’s variable margin (…). The estimate includes the margin, without disclosing unit prices.
Calculation scenario: 30% of battery storage cost, up to PLN 16,000, only for PV paired with storage. These are not verified terms of a currently open funding round.
Estimate after subtracting the grant, assuming the full unused PLN 53,000 allowance and sufficient income. Select only after confirming eligibility for the tax relief.
Gross cost…
− battery storage grant…
− thermal modernisation tax relief…
Effective cost…
…annual savings
…investment payback
…profit over 15 years
Daily battery operation and electricity prices
Illustrative chart: the battery charges at low cost (PV/off-peak) and discharges during expensive peak hours.
Cumulative cash flow (break-even point)
The investment pays back when the curve crosses zero.
Ask about sizing We will confirm the system selection and price individually.
Calculator assumptions and limitations

The result is indicative and illustrative only, and is neither an offer nor advice. The model uses estimated prices, PV generation of 1,000 kWh/kWp per year, a simplified annual self-consumption balance and optional arbitrage income entered by the user. Losses follow the specified efficiency. The model does not analyse hourly consumption or support programme availability. Grants and tax relief are optional scenarios, not confirmation of eligibility. An individual assessment of costs, the tariff and financing terms is needed before making a decision.

Ask about system selection and a quote

Describe your needs and our specialist will select a battery, estimate profitability including grants and prepare a quote. No obligation.

Thank you. We will contact you about system selection and pricing.
Data controller and terms: Privacy policy. The Platform is operated by the EFET Foundation.

Selling a used battery or a utility-scale system?

Find and list utility-scale storage systems (BESS investment projects rated in MW) in the RES project catalogue. Sell operating systems with an operating history and full legal support.

BESS projects in the catalogue List a BESS project
What determines battery storage profitability? The result depends on the consumption profile, tariff, electricity purchase and sale prices, equipment costs and storage losses. Grant availability and tax relief eligibility require a separate check of programme terms and the investor’s circumstances. The calculator does not confirm eligibility or whether applications are open.