500 000 000 Free audit

Panels sized to your bill, not to a catalogue

Under net-⁠billing you gain most from power you use straight away. So at the audit we look at when your house uses electricity during the day, and only then choose the system size.

Book a free audit or call: 500 000 000

Installer with a tablet and a laser meter talking to the owner, who points at the roof
Illustrative photo
Size for a house
4-⁠10 kWp
Installation
1-⁠2 days
Panel warranty
usually 25 years
Audit
free

Savings calculator

How much will you keep?

Move the bill slider and pick the way your roof faces. We use the assumptions listed below.

What are we calculating?
Which way does the roof face?

Roof facing south: 1,000 kWh per kWp a year

Estimated saving in the first year

about PLN 2,740

System
9 panels, 4.05 kWp
Production
4,050 kWh a year
Covers
approx. 65% of the bill
Over 10 years
about PLN 30,700

An estimate, not a quote. The result depends on shading, the roof pitch and when during the day you use power. We work it out precisely at the audit.

Cumulative saving: how much you keep after each year (rising electricity prices, ageing panels)
Cumulative saving year by year
After year 1PLN 2,700
After year 2PLN 5,600
After year 3PLN 8,400
After year 4PLN 11,400
After year 5PLN 14,400
After year 6PLN 17,500
After year 7PLN 20,700
After year 8PLN 24,000
After year 9PLN 27,300
After year 10PLN 30,700

Assumptions and method
Grid electricity price
1.1 PLN/kWh
Value of energy sent to the grid (net-⁠billing)
0.45 PLN/kWh
Electricity price growth
3% a year
Panel output loss
0.5% a year
Energy used straight away at home
35% of production (with a heat pump 50%)
Heat pump electricity use
4,000 kWh a year
Output of one panel
0.45 kWp
Yield per 1 kWp a year, kWh
E 840SE 960S 1,000SW 960W 840

Annual consumption comes from your bill and the electricity price. The system is sized to produce roughly what the house uses over a year. Energy used straight away counts at the purchase price, surplus sent to the grid at the selling price, and the saving never exceeds the bill. We do not include the cost of the system or grants: that depends on the quote after the audit.

Electricity prices change, so we update the assumptions in the website dashboard and the calculator uses the new ones straight away.

Book an audit with this result

Energy flow

One system, one flow of power

Panels produce during the day, the house takes what it needs and the heat pump and air conditioning use the surplus. Less power goes back to the grid for pennies.

  1. Sun

    About 1,000 kWh from every kWp of panels a year on a south-facing roof.

  2. Solar PV

    Turns light into electricity. The inverter makes sure the house uses it first.

  3. House

    Uses power as it comes: fridge, washing machine, chargers. The surplus moves on instead of going to the grid for pennies.

  4. Heat pump

    Turns 1 kWh of electricity into 3-⁠4 kWh of heat for underfloor heating and hot water.

    Heat pumps

  5. Air conditioning

    In summer it cools exactly when the panels produce the most. In winter it can add heat.

    Air conditioning

Projects

Solar PV projects

The projects are samples (the company is fictional) and the photos show the type of installation, not a specific house.

All projects

Process

Six weeks from audit to power

A typical timeline for a detached house.

  1. Week 1

    On-site audit

    We measure the roof, check the fuse board and shading, and go through last year’s bills.

  2. Week 2

    Design and quote

    You get the panel layout on a roof plan, a production estimate and one price for everything.

  3. Week 3

    Grant application

    We fill in the application and collect the attachments. You just sign.

  4. Weeks 4-⁠5

    Installation

    Panels usually take 1-⁠2 days, a heat pump 2-⁠3 days. We clean up after ourselves.

  5. Week 6

    Grid connection

    We register the system with the grid operator and show you how to read the inverter app.

Questions

Solar PV questions

Does solar pay off under net-⁠billing?

Yes, if you use most of the electricity straight away. Energy sent to the grid is worth less than energy you buy, so we size the system to your consumption, not with a big margin, and suggest which appliances to run when production peaks.

How long does installation take?

Panels on a detached house usually take 1-⁠2 days. The whole process, from the audit to the grid connection, takes about 6 weeks.

My roof faces east or west. Does it make sense?

Yes. Each panel produces less than on a south roof (the calculator uses 840 instead of 1,000 kWh per kWp a year), but production spreads over the morning and afternoon, when the house uses power anyway.

Do I need a home battery?

Not always. A battery makes sense if you use a lot of power in the evening or have a heat pump. At the audit we show both options with prices.

What if part of the roof is shaded?

At the audit we check shade from the chimney, trees and nearby buildings at different times of day. Shaded panels get optimisers, or we leave that spot out.

Grants

We handle the grant paperwork

Solar panels and heat pumps can currently be co-funded by grant programmes and a thermal retrofit tax relief. The rules and amounts change every few months, so we do not promise them here: at the audit we check what applies to you, and we fill in the application ourselves.

  1. We check which programmes you qualify for
  2. We fill in the application and collect the attachments
  3. We keep track of the settlement deadlines

Free on-site audit

We will come over, measure the roof and check the wiring. No fees and no commitment; we will call you back to book a date.

Halny Energia is the data controller. We will use your details only to book the audit and delete them after 7 days if no contract is signed. Privacy policy

This is a demo website: your request will not reach any company.

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