Hampshire
Solar panels in Horndean, priced before anyone visits.
A 12-panel roof in Horndean makes about 7,070 kWh a year and costs £6,360 installed; a free 30-minute video call sizes it to yours.
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Sunlight in Horndean, in numbers
Horndean's best month is July, at 136.1 kWh per kWp; December manages 39.3. Over the year that comes to 1,111 kWh per kWp, 7% above our Hampshire county estimate.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 42.6 |
| February | 59.4 |
| March | 97.3 |
| April | 125 |
| May | 132 |
| June | 135 |
| July | 136 |
| August | 120 |
| September | 102 |
| October | 70.5 |
| November | 50.9 |
| December | 39.3 |
Source: PVGIS v5.2 (European Commission JRC), SARAH3 database, 1 kWp, 14% system loss, 35 degree pitch, due south, checked September 2026.
For scale: 1,111 kWh per kWp in Horndean against 925, our GB average (the mean of our 85 county PVGIS estimates), which puts Horndean 20% above it.
How Horndean compares
Among the places we publish figures for, Horndean is one of 45 Hampshire towns we track, and it ranks 20th of 45 for solar yield. It is a medium town in the House of Commons Library classification, with 34,590 residents, and its roofs see 3.04 peak sun hours a day across the year. That drives the standard 12 panel model to 7,066 kWh of generation, of which around 6,129 kWh is exported at 12p for £736 a year, with £247 saved on electricity you would otherwise buy at 26.32p.
These are starting numbers, not a quote. The calculator below opens on Horndean'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.
Planning applications here go through East Hampshire; nationally, the House of Commons Library classes Horndean as a medium 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.
The figures use PVGIS for the centre of Horndean (50.91055, -1.01263), a 26.32p/kWh import price and £1,000 per kWp installed; see the help page for the full method.
SSEN and your Horndean connection
Horndean sits in Scottish and Southern Electricity Networks' Southern England licence area, so SSEN is the network operator (DNO) any solar panels or battery here are registered with.
Below 3.68kW per phase of inverter and battery output, the G98 route applies: the installation is notified to SSEN within 28 days of commissioning, with no prior approval.
Larger systems go through G99 instead, applied for before installation. On timing: SSEN says it can take up to 45 working days to issue a quotation for a generation connection above 3.68kW per phase and up to 50kW.
Sources: NESO DNO licence areas (3 May 2024); SSEN, micro-generation connections page, checked 25 September 2026. G98 vs G99, explained.
Adding a heat pump or an EV charger in Horndean
A heat pump in Horndean
In December, the darkest month here, 12 panels in Horndean make about 250 kWh. That is when a heat pump runs hardest, so its running cost in Horndean comes down to the tariff and the flow temperature rather than the roof.
The Boiler Upgrade Scheme, open in England and Wales, takes £7,500 off an air source or ground source heat pump, or £2,500 off an air-to-air unit. Homes on oil or LPG with no mains gas get £1,500 more until March 2027 (gov.uk, checked 28 September 2026).
Charging an EV in Horndean
Summer is where a car earns its place. In July, 12 panels in Horndean make about 870 kWh, against roughly 70 kWh a typical home uses in daylight that month on our calculator's typical-use settings, so there is surplus a smart charger can put into the car instead of exporting it.
The calculator above includes a 7.4kW smart charger from £1,100 installed. Renters and flat owners with off-street parking can claim 75% of a chargepoint's cost, up to £500 per socket, until 31 March 2027 (gov.uk, checked 28 September 2026).
The packages, priced before anyone visits
Every system is designed around your roof on the free call before anything is fitted.
Solar panel servicing and repair in Horndean
If a system in Horndean is underperforming, start with the guides below: repair benchmarks, service scope, and the inverter question.
Horndean solar questions
How much energy would 12 solar panels make in Horndean?
Horndean averages 3.04 peak sun hours a day, which PVGIS turns into 1,111 kWh per kWp a year. On a 12-panel, 6.36 kWp roof that is about 7,070 kWh, 68% of it between April and September.
What does a typical solar system cost in Horndean?
Solar is priced at £1,000 per kWp installed wherever you live, so a 12-panel, 6.36 kWp system costs £6,360 in Horndean, exactly as it would anywhere else, before any battery. Location changes what the system makes, not what it costs: here that is about 7,070 kWh a year. The final figure comes from your roof on the design call.
Who is the network operator in Horndean, and do I need a G99 application?
The operator is Scottish and Southern Electricity Networks (SSEN). Most home systems use the G98 route, a notification within 28 days of switch-on for up to 3.68kW per phase, so nothing waits on the network. Above that, G99 applies and has to be granted first. SSEN says it can take up to 45 working days to issue a quotation for a generation connection above 3.68kW per phase and up to 50kW. Your design call checks which route yours needs.
What happens to the solar I do not use in Horndean?
Around £736 a year at 12p per kWh, for the roughly 6,129 kWh a 12-panel system in Horndean exports with typical use. Rates vary by supplier and some need their own tariff; the export rates table is dated and sourced.
How does solar perform in Horndean in the winter months?
December is the weakest month in Horndean: about 250 kWh from 12 panels, against 870 kWh in July. The panels still generate on bright winter days; they just cover a smaller share of what the house uses.
How Horndean 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 Horndean |
|---|---|---|
| Horndean | 1,111 | this town |
| Waterlooville | 1,125 | +14 kWh |
| Havant | 1,133 | +22 kWh |
| Emsworth | 1,146 | +35 kWh |
| Portsmouth | 1,124 | +13 kWh |
| Petersfield | 1,056 | −55 kWh |
| South Hayling | 1,127 | +16 kWh |
Each row is a PVGIS v5.2 run at that town's centre with the same settings. Treat gaps of a few kWh as noise and gaps over about 30 kWh per kWp as real differences in sunshine.
Also for Horndean: Solar panels in Horndean from OVO Solar & Battery
Also near Horndean
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Further reading for Horndean
Sourced, dated and written by us. The same ground we cover on your free call.
0% VAT on solar and batteries: what qualifies, and what does not
Zero VAT until 31 March 2027, then 5% returns. What qualifies, and what it is worth.
Read the guide →Inside a home battery: capacity, power and losses
Usable capacity, kW output, round trip losses and chemistry, in plain terms.
Read the guide →Charging an EV from your own solar
Every surplus kWh is 3.6 to 5 miles. Whether that beats a 7p overnight rate is arithmetic.
Read the guide →Heat pump running costs versus a gas boiler, assumptions shown
Four numbers decide it: seasonal efficiency, flow temperature, tariff and heat demand.
Read the guide →EV tariffs compared: the cheapest overnight windows
Overnight rates of 6.99p to 9p against a 26.32p capped average, compared.
Read the guide →How to check an MCS certificate is genuine, before the deposit leaves your account
A logo proves nothing. Certification is business specific, technology specific and checkable.
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.