How many solar panels do I need for a typical house?

The number of solar panels you need depends on three key factors: Your annual electricity consumption The size (output) of each panel The roof's area and location

Your electricity consumption is the primary starting point

An average Danish detached house typically uses 7,000–9,000 kWh per year. To cover this with solar panels, you will need a system of approx. 8–10 kWp, depending on your desired coverage and how much of the electricity you want to use yourself.

Panel output

Solar panels today typically have an output of 350–450 watts per panel. The higher the output, the fewer panels you will need. At EcoRay, we use high-performance, UV-coated panels that maximize production – even in cloudy conditions.

How much space do you have on your roof?

A panel typically measures approx. 1.8 m², and a 10 kWp system therefore requires around 40–45 m² of roof space, depending on the panel type and the distance between them. It must also be assessed whether the roof has the correct orientation and slope – and how much shade there is during the day.

EcoRay's approach: data-driven and tailor-made

We do not make standard systems. We assemble an intelligent system based on data from your home, your consumption, and your roof, and calculate the precise number of panels that makes the most sense economically and energy-wise. You will receive a complete report before you make a decision – and we will advise you impartially regarding oversizing (for future consumption) or optimizing self-consumption with a battery and grid balancing.

In short:

Most homeowners will need 18–29 panels to cover their electricity consumption. A 10 kWp system requires approx. 22–29 panels, depending on the panel type. EcoRay adapts the solution so that performance, price, and future needs are aligned.