What Size Solar System Do I Need?
A simple starting point
System size is usually based on how much electricity your home uses.
Typical guide
~3—4kW system: £80—£120/month bill
~4—5kW system: £120—£180/month bill
~5—6kW system: £180+/month bill
What this means
Larger systems generate more electricity
But roof space and layout can limit what’s possible
Important to know
Most homes don’t aim to cover 100% of usage.
Instead, systems are designed to:
reduce grid reliance
improve long-term savings
work within the constraints of the property
Why this is usually unclear
In many cases, system size is only discussed once you’re already speaking to an installer.
We think it’s helpful to understand this earlier.
Final Note
This is a starting point — actual systems vary depending on your home, usage, and installation setup.
Most websites ask for your details before showing this — we think it’s more helpful to understand the basics first.