Solar panels in Southend-on-Sea, East of England
Roofs in Southend-on-Sea get about 1,069 hours of usable sunlight a year — less than 87% of the cities we've measured. Here's what that means in cost, savings and payback, using real rooftop data rather than a national average.
Check your specific roof in Southend-on-Sea → City averages are a starting point; your own roof's size, pitch and shading change the answer a lot.
What a typical Southend-on-Sea solar system costs
A 7-panel system (2.8 kW) is about right for an average Southend-on-Sea home using 2,500 kWh a year. It would produce roughly 2,544 kWh annually and offset 100% of that usage.
| System | Size | kWh/yr | Net cost | Saves/yr | Payback |
|---|---|---|---|---|---|
| 8 panels | 3.2 kW | 2,908 | £5,440 | £472 | 11.5 yrs |
| 12 panels | 4.8 kW | 4,362 | £8,160 | £647 | 12.6 yrs |
| 16 panels | 6.4 kW | 5,815 | £10,880 | £821 | 13.2 yrs |
| 20 panels | 8 kW | 7,269 | £13,600 | £996 | 13.7 yrs |
| 26 panels | 10.4 kW | 9,450 | £17,680 | £1,257 | 14.1 yrs |
How we worked this out for Southend-on-Sea
Every number on this page comes from these seven steps. Nothing is a national average — the sunlight figure is measured from Southend-on-Sea rooftops.
| # | Step | Result |
|---|---|---|
| 1 | What one panel makes here 400W ÷ 1000 × 1,069 sun hrs × 0.85 system losses |
363 kWh/yr |
| 2 | Panels needed to cover typical usage 2,500 kWh ÷ 363 kWh per panel |
7 panels |
| 3 | System size 7 panels × 400W |
2.80 kW |
| 4 | Annual production 2.80 kW × 1,069 hrs × 0.85 |
2,544 kWh/yr |
| 5 | Installed cost 2,800 W × £1.70 per watt (VAT is 0% on UK installs) |
£4,760 |
| 6 | Annual saving 875 kWh used as generated × 26.1p + 1,669 kWh exported × 12p |
£429/yr |
| 7 | Payback £4,760 ÷ £429 per year |
11.1 years |
Step 6 is where most calculators quietly overstate things. Only 34% of what a system this size produces in Southend-on-Sea is used the moment it is generated; the other 1,669 kWh is exported and paid at the Smart Export Guarantee rate, not your import price. Valuing every kWh at the full 26.1p retail rate — which many calculators do — would show a payback of 7.2 years instead of the 11.1 we show. That 3.9-year difference is the single biggest reason our figures look worse than other sites' for Southend-on-Sea.
Assumptions: 400W panels, 15% system losses (inverter, wiring, heat, soiling), £1.70/W installed, 2,500 kWh typical annual household use, 26.1p/kWh electricity. Change any of those and every figure above moves — which is exactly why a single national "solar costs X" number is misleading.
Notice that payback barely improves as systems get bigger, and eventually gets worse. That's because you can only save money on electricity you were going to buy anyway. Once a system covers your usage, extra panels mostly generate exports at a much lower rate.
Why Southend-on-Sea gets 1,069 sun hours
That figure comes from Google's analysis of real rooftops across Southend-on-Sea — it already accounts for shading from trees, chimneys and neighbouring buildings, which is why it's lower than the raw "hours of daylight" figures you'll see elsewhere. An unusually open, unshaded roof in Southend-on-Sea reaches about 1,172 hours, roughly 10% better than typical.
The numbers behind this page
| Typical usable sunlight | 1,069 hrs/yr |
|---|---|
| Unshaded roof | 1,172 hrs/yr |
| Electricity rate (East of England avg) | 26.1p/kWh |
| Installed cost assumed | £1.70/W |
| Panel size assumed | 400 W |
| Typical household usage | 2,500 kWh/yr |
| Power used as generated | 34% |
| Paid for exported power | 12p/kWh (SEG) |
| Rooftops sampled here | 7 |
| Google imagery from | 2025 |
When Southend-on-Sea actually produces
Annual totals hide the thing that catches people out: 42% of Southend-on-Sea's yearly sunlight arrives in May–July, and just 9% across November–January.
| Month | Sun hrs | Share of year |
|---|---|---|
| Jan | 31 | |
| Feb | 51 | |
| Mar | 81 | |
| Apr | 116 | |
| May | 143 | |
| Jun | 156 | |
| Jul | 150 | |
| Aug | 127 | |
| Sep | 94 | |
| Oct | 60 | |
| Nov | 35 | |
| Dec | 25 |
That is a severe seasonal swing — Southend-on-Sea produces roughly 6.1× as much in Jun as in Dec. A system sized to cover your annual usage will overproduce badly in summer and fall well short in winter, so how your utility credits exported power matters more here than in most places.
The annual total is measured from Google's rooftop imagery. Its split across months is calculated from solar geometry at Southend-on-Sea's latitude, not separately measured, so treat the monthly figures as the shape of a typical year rather than a forecast.
How Southend-on-Sea compares to the other 788 cities
| Measure | Southend-on-Sea | Rank of 788 |
|---|---|---|
| Usable sunlight | 1,069 hrs | 688th |
| Sunlight lost to shade | 9% | 114th most |
| Median roof size | 77 m² | 747th largest |
| Electricity rate | 26.1p | 166th highest |
| Payback | 11.1 yrs | 451st fastest |
| Grid carbon | 479 kg/MWh | 566th dirtiest |
What actually stands out about Southend-on-Sea:
- Small roofs. The median Southend-on-Sea roof is 77 m², smaller than 95% of cities measured — worth checking your own footprint before assuming a standard system fits.
Cities with almost the same sunlight
The closest matches to Southend-on-Sea's 1,069 usable sun hours elsewhere in the UK. Sunlight varies far more across Britain than electricity prices do, so these are the places where a system of the same size produces roughly the same amount.
| City | Sun hrs | Rate | Payback |
|---|---|---|---|
| Crawley, South East | 1,063 | 26.1p | 11.1 yrs |
| Canterbury, South East | 1,076 | 26.1p | 11.1 yrs |
| Exeter, South West | 1,060 | 26.1p | 11.2 yrs |
| Barnstaple, South West | 1,060 | 26.1p | 11.2 yrs |
Nearby cities
See all of East of England → statewide sunlight, rates, incentives and every city we've measured.
Southend-on-Sea solar questions
How many solar panels do I need in Southend-on-Sea?
About 7 panels for an average home using 2,500 kWh a year. Southend-on-Sea roofs get 1,069 usable sun hours, so each 400W panel produces roughly 363 kWh annually. A typical Southend-on-Sea roof fits about 26 panels, so roof space is unlikely to be your limit.
Is solar worth it in Southend-on-Sea?
At 26.1p/kWh and 1,069 sun hours, a typical system pays for itself in about 11.1 years and returns roughly £5,959 over a 25-year panel life. That is slower than average, so compare several quotes before committing. Exported power earns 12p/kWh under the Smart Export Guarantee, well below the 26.1p you pay to import.
How much do solar panels cost in Southend-on-Sea?
A 2.8 kW system costs about £4,760 before incentives. That works out near £1.70 per watt installed. Roof pitch, shading, electrical panel upgrades and equipment choice move the price most, which is why quotes for the same house can differ by thousands.
Worth reading before you buy
Estimates only, generated 2026-08-22 from Google Solar API rooftop samples and average East of England electricity rates. Not a quote and not financial advice. Your roof, usage, utility plan and local incentives will change these numbers — get real quotes before buying.