How Much Solar Power Can My Roof Generate in Hertfordshire?
If you live or run a business in Hertfordshire, you’ve probably noticed more and more rooftops covered with solar panels. With rising energy prices and a growing interest in sustainability, solar power has become one of the smartest investments for homes and companies alike. Many property owners are now considering how much electricity their roof could actually generate, and the good news is that Hertfordshire receives a solid amount of sunlight — roughly 950–1,050 kWh per square metre per year — making it an excellent location for solar installations that deliver real savings and long-term value.
Let’s break it down in simple terms.
1. How Much Sunlight Does Hertfordshire Get?
Despite the British weather, Hertfordshire receives a good amount of solar energy — roughly 950–1,050 kWh per square metre per year.
That’s more than enough to make solar panels worthwhile, especially with today’s higher efficiency modules.
As a rule of thumb:
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A 4 kWp residential solar system in Hertfordshire can produce around 3,800–4,200 kWh per year.
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A 10 kWp system (common for small commercial or larger homes) could generate 9,500–10,500 kWh per year.
That’s enough to cover a large portion of an average household’s electricity use — or significantly reduce a business’s daytime consumption.
2. Key Factors That Affect Your Solar Output
Every property is a little different, but these are the main points that determine how much energy your system can produce:
1. Roof Orientation
South-facing roofs are ideal, but east–west arrays can still achieve 80–90% of peak performance.
2. Roof Pitch (Angle)
A roof angle of 30–40° gives the best year-round yield in Hertfordshire.
3. Shading
Nearby trees, chimneys, or buildings can reduce generation. That’s why we always carry out a shading analysis as part of our PV design.
4. System Size and Panel Efficiency
Modern panels (400–450 W) are more efficient than ever. For example, a 4 kW array may now take up only 20 m² of roof space.
5. Inverter and Battery Choice
A well-matched inverter and optional battery storage can improve your self-consumption and overall savings.
3. Example: Typical Hertfordshire Home
Let’s look at an example:
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4 kWp system (10 x 400 W panels)
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Orientation: South
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Estimated generation: 4,000 kWh per year
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Annual electricity savings: £700–£900 (depending on tariff)
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CO₂ saved: ~1 tonne per year
Add a battery storage system, and you could use up to 85–90% of your own solar energy — cutting grid imports dramatically.
4. What About Commercial Roofs?
Hertfordshire has a large number of warehouses, offices, and workshops with ideal roof space.
A 50 kWp commercial array could produce over 47,000 kWh per year, offsetting thousands of pounds in annual electricity costs — and improving sustainability credentials.
Many local businesses also take advantage of the Smart Export Guarantee (SEG) to earn money for surplus energy exported to the grid.
5. How Belectrix Can Help
At Belectrix Ltd, we design and install tailored solar PV systems across Hertfordshire, Bedfordshire, Buckinghamshire, and North London.
Our process includes:
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A free performance estimate using your roof data and shading model
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Clear advice on system size, payback time, and battery options
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Professional installation to the latest MCS and NICEIC standards
Whether you’re a homeowner looking to reduce bills or a business aiming to reach net zero, we’ll help you find the best setup for your roof.
Ready to See What Your Roof Can Do?
Every property is unique, so the best way to know your potential is to get a free solar performance assessment.
Contact Belectrix Ltd today to find out how much your roof could generate — and how much you could save in 2025 and beyond.
