4KW retractable solar panel

What is a 4KW Solar System?

A 4kW solar PV system is the UK’s most common solar array. While some domestic and commercial solar systems come in larger sizes, a 4kW PV solar system can handle most of the energy needs of the average British home. Now, in terms of components, a 4 kW array will have a set of solar panels, a network of cables, and an inverter.

How much space does a 4KW Solar System take up?

Depending on the styles of solar system and your panels the answer can vary. As a rough guide though, a standard 4kW solar panel system is comprised of 8-12 solar panels. This equates to approx.16-25m² of roof space. This example assumes you’re using more efficient monocrystalline panel.

How much does a 4KW Solar System cost?

A 4kW system will produce up to 3,400kWh of energy per year. It will cost approximately £5,000 – £6,000 to fit a 4kW solar system, with a return on investment of £10,500 – £11,500 and a break-even point of 8 years. Solar panels have been popping up on rooftops across the country for a number of years, and with good reason!

Can you build a 4KW Solar System?

You can build a 4kW system by purchasing solar panels with peak output ratings that add up to 4,000 watts (W). This doesn’t mean your system will automatically produce 4,000kWh, as solar panel output depends on factors like your location, roof angle and direction, and the quality of the gear.

How many solar panels are in a 4KW system?

The number of solar panels in a 4kW system depends on the size of the panels themselves. If you have a 400W panel, it will produce 400 watt-hours in standard test conditions, which includes a cell temperature of 25°C and solar irradiance of 1,000W per m², and is how every company checks a solar panel’s capabilities.

What are the pros and cons of a 4KW Solar System?

To help you clearly weigh the pros and cons, we've listed some of the most important points to consider. Energy cost savings: A typical 4kW solar system in the UK can generate about 3,400kWh per year. This can save an average household up to £660 a year on their electricity bills, with additional savings available through the SEG incentive.