Hertfordshire
Solar panels in Radlett, sized to your roof.
A 12-panel roof in Radlett makes about 6,470 kWh a year and costs £6,360 installed; a free 30-minute video call sizes it to yours.
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What a roof in Radlett can generate
PVGIS puts Radlett at 1,018 kWh per kWp a year, level with our Hertfordshire county estimate. 68% of it arrives between April and September, peaking in July.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 39.6 |
| February | 53.3 |
| March | 88.2 |
| April | 114 |
| May | 121 |
| June | 122 |
| July | 124 |
| August | 111 |
| September | 95.5 |
| October | 66.3 |
| November | 46.3 |
| December | 36.3 |
Source: PVGIS v5.2 (European Commission JRC), SARAH3 database, 1 kWp, 14% system loss, 35 degree pitch, due south, checked September 2026.
Our GB average is 925 kWh per kWp a year, the mean of the 85 county PVGIS estimates we publish; at 1,018, Radlett is 10% above it.
How Radlett compares
Small towns rarely get published solar figures, so here are the numbers for Radlett. It is one of 27 Hertfordshire towns we track, and it ranks joint 14th of 27 for solar yield, a town of 8,161 people in the House of Commons Library settlement data. PVGIS gives its roofs 1,018 kWh per kWp a year, 2.79 peak sun hours a day averaged across the seasons, and the standard 12 panel model turns that into £912 of year one benefit, £247 of it from your own generation and £665 from export at 12p.
These are starting numbers, not a quote. The calculator below opens on Radlett's own PVGIS figure; change the panels, the battery or the export rate and it reruns. The design call replaces every assumption with your roof and your bills.
Radlett sits within Hertsmere, its local planning authority, and the House of Commons Library classes it as a small town.
The charger is in the installed price but left out of payback: charging savings depend on your mileage and tariff, which the design call models properly.
Your real roof and usage, worked through on a free 30-minute video call. Use the full form or leave three details below.
Price this for your roof
Three details. We call or text within one working day to book your free 30-minute design call, on video or by phone if you prefer.
Generation is modelled from PVGIS satellite data for Radlett's own coordinates (51.68373, -0.32085), using the same 26.32p/kWh import value and £1,000 per kWp installed pricing as every Clearline estimate; the methodology is on our help page.
Connecting solar to the Radlett network
The distribution network operator (DNO) for Radlett is UK Power Networks, which runs the East England licence area.
G98 is the simple route. If the inverter, plus any battery, stays at or under 3.68kW per phase, UK Power Networks only has to be told within 28 days after the system is commissioned.
Anything bigger is a G99 case and is applied for first. Ofgem's guaranteed standard for a low voltage generation connection quotation is 45 working days, with £80 paid for each working day late, and it binds UK Power Networks as it does every network operator.
Sources: NESO DNO licence areas (3 May 2024); Ofgem, Distributed Generation Standards Direction guidance, checked 27 September 2026. G98 vs G99, explained.
Adding a heat pump or an EV charger in Radlett
A heat pump in Radlett
Solar and a heat pump pull in opposite directions through the year: Radlett's roofs make 1,120 kWh from November to February on a 12-panel system, and 3,040 kWh from May to August. The heating season leans on the grid, so off-peak rates do the heavy lifting.
In England, the Boiler Upgrade Scheme pays £7,500 towards an air source or ground source heat pump and £2,500 towards an air-to-air one, with £1,500 more until March 2027 for homes heated by oil or LPG with no mains gas (gov.uk, checked 28 September 2026).
Charging an EV in Radlett
A 12-panel roof in Radlett makes about 790 kWh in July. A typical home uses around 70 kWh of that in daylight (the calculator's typical-use settings), which leaves most of the month's output for an EV or for export.
Renters and flat owners with private off-street parking can get 75% off a chargepoint and its installation, up to £500 per socket, until 31 March 2027 (gov.uk, checked 28 September 2026). The calculator above adds a 7.4kW smart charger from £1,100 installed.
What the named kit costs, installed
Every system is designed around your roof on the free call before anything is fitted.
Solar panel servicing and repair in Radlett
Guidance is nationwide, so the benchmarks hold in Radlett: repair costs, service scope, and when the inverter is the real fault.
Common questions about solar in Radlett
What could a roof in Radlett generate?
PVGIS puts a roof in Radlett at 1,018 kWh per kWp a year, 2.79 peak sun hours a day averaged across the seasons. A 12-panel, 6.36 kWp system makes about 6,470 kWh a year, most of it between April and September.
How much are solar panels in Radlett?
The price does not move by postcode. At £1,000 per kWp installed, 12 panels (6.36 kWp) come to £6,360 in Radlett before a battery. What Radlett changes is the return, about 6,470 kWh a year from that system, and your design call prices your actual roof.
Do I need permission from the DNO for solar in Radlett?
Usually not in advance. UK Power Networks, the network operator for Radlett, only needs a G98 notification within 28 days of commissioning for systems up to 3.68kW per phase. Bigger inverter or battery outputs need G99 approval first. Ofgem's guaranteed standard for a low voltage generation connection quotation is 45 working days, with £80 paid for each working day late, and it binds UK Power Networks as it does every network operator. "See our DNO explainer.
How much can I earn from exporting solar in Radlett?
With typical use and no battery, a 12-panel system in Radlett exports about 5,538 kWh a year. At 12p per kWh that is roughly £665; a supplier paying more, or a battery that keeps more for the evening, changes the figure. See the export rates table.
Do solar panels work in winter in Radlett?
Yes, at a lower level. PVGIS gives Radlett 36.3 kWh per kWp in December and 39.6 in January, so a 12-panel system makes about 230 kWh and 250 kWh in those months, against 790 kWh in July. Winter output mostly covers daytime use rather than exporting.
How Radlett compares with its neighbours
Same satellite dataset, same assumptions, so the differences are real geography rather than modelling noise.
| Town | kWh per kWp a year | vs Radlett |
|---|---|---|
| Radlett | 1,018 | this town |
| Borehamwood | 1,015 | −3 kWh |
| London Colney | 1,022 | +4 kWh |
| Bushey | 1,024 | +6 kWh |
| Watford | 1,013 | −5 kWh |
| St Albans | 1,023 | +5 kWh |
| Abbots Langley and Kings Langley | 1,016 | −2 kWh |
Same PVGIS v5.2 query for every town. Small differences are within year-to-year weather; more than about 30 kWh per kWp apart is geography.
Also for Radlett: Solar panels in Radlett from OVO Solar & Battery
See a number before you speak to anyone
Answer a few questions about your roof and usage and see an instant solar and battery estimate. No email needed to see the result.
Further reading for Radlett
Sourced, dated and written by us. The same ground we cover on your free call.
Microinverters, optimisers or a plain string inverter: who needs what
Shade and roof layout decide this. An honest triage of the three approaches.
Read the guide →Tesla Powerwall 3 against the alternatives, and where each one wins
The strongest single box in the market, and the houses it is still wrong for.
Read the guide →Home EV charger types and speeds, explained properly
Granny cable, 7kW wall unit or 22kW three phase. What each adds per hour, and which you need.
Read the guide →The Boiler Upgrade Scheme, explained
A fixed amount, claimed on your behalf by our installation teams, with a real deadline on the £9,000 version.
Read the guide →Will energy prices keep rising, and by how much
The January forecasts jumped fast. What is confirmed, what is guessed, and whether solar is a real hedge.
Read the guide →G98 or G99: which one applies, what the application involves, and how long it takes
The G98 line sits at 3.68kW per phase. Above it, your network operator has to say yes first.
Read the guide →Get my free quote
Takes about two minutes. We call or text within one working day to book your free 30-minute video design call at a time that suits you. We design it around your roof and your numbers, and our MCS-certified, fully insured installation teams install it.