What solar costs for a 100, 120, 150 or 200 m² house
Floor area alone does not tell you how much power you use. The bill does; the area matters when you heat the house or water with electricity.
Yearly saving on your bills
PLN 3,425
6,300 kWh produced · 27 % used on site
| Used directly and from the battery | 1,698 kWh |
| Exported to the grid | 4,603 kWh |
| Deposit (×1.23) | PLN 1,569 |
| Deposit spent on energy | PLN 1,408 |
| Overpayment refunded | PLN 162 |
| Bill before / after | PLN 4,373 / PLN 1,110 |
| Pays back in 10 years up to | PLN 34,253 |
Hourly model of an average day in each month; surplus priced at the last 12 months of RCEm (PSE) plus the gain from negative RCE counted as zero. An estimate, not an offer; fixed charges excluded.
Solar for a 150 m² house has no single price, because the system size depends on power use, not on floor area. A house heated with gas or coal, with a bill of 3,000 kWh a year, needs about 2.5 kWp if the panels are to give 90% of yearly use, and that system pays back within 10 years if it costs at most PLN 17,801. Floor area starts to matter with electric heating. A heat pump in a 150 m² house with a demand index of 110 kWh/m², at the minimum efficiency under EU Regulation 813/2013, uses about 5,323 kWh, and heating water with an element, by the formula in the Polish building energy performance regulation, about 3,613 kWh. Together with the bill that makes 11,936 kWh and a size of about 10.1 kWp, worth up to PLN 68,020. The mini-calculator below works this out for your floor area, and the calculator at the top for your municipality.
Checked by Radif Partners · Editorial policy · Method
Size and break-even price by floor area
The table compares two houses with the same power bill before heating, 3,000 kWh a year. The first heats with gas or coal, the second with a heat pump and heats water with an element. The size is set so the panels give 90% of yearly use, with the average municipal PVGIS yield, 2026 G11 prices and RCE settlement.
| House | No electric heating | 10-year payback up to | With pump and water: use | Size | 10-year payback up to |
|---|---|---|---|---|---|
| 80 m² | 2.5 kWp | PLN 17,801 | 7,766 kWh | 6.6 kWp | PLN 44,878 |
| 100 m² | 2.5 kWp | PLN 17,801 | 8,957 kWh | 7.6 kWp | PLN 51,495 |
| 120 m² | 2.5 kWp | PLN 17,801 | 10,149 kWh | 8.6 kWp | PLN 58,106 |
| 150 m² | 2.5 kWp | PLN 17,801 | 11,936 kWh | 10.1 kWp | PLN 68,020 |
| 200 m² | 2.5 kWp | PLN 17,801 | 14,914 kWh | 12.7 kWp | PLN 84,969 |
In a house without electric heating the floor area does not change the size, because it does not change the bill. In a house with a pump every extra 50 m² adds several thousand kilowatt-hours, but mostly in winter. That is why the break-even price grows more slowly than the size: winter output is small, and the summer surplus goes to the grid at the market price.
What solar system for your house?
System size
2.5 kWp
| Total yearly use | 3,000 kWh |
| Of which pump / hot water | 0 / 0 kWh |
| Price that pays back in 10 years | PLN 17,801 |
Output = 90% of use, average PVGIS municipal yield. Pump: house at 110 kWh/m²·yr, minimum SCOP under EU Reg. 813/2013.
Where to start when sizing a system
First add up the use on your invoices for the last 12 months. If you plan a heat pump, add its use: the heat pump and solar calculator works it out more precisely and shows how much of it the roof covers each month. If you heat water with electricity, see the solar for water heating page. Only with that total, enter the size and use in the calculator at the top of the page and compare the result with an installer’s quote, then judge the quoted price on the solar price page.