Peak Sun Hours in Southend-on-Sea, England, United Kingdom
- Solar zone
- Zone 1 (modest)
- Best month
- June (5.4)
- Worst month
- December (0.6)
- Climate
- Temperate · 10.8°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 0.80 | 1.42 | 1.60 | 0.45 | 4.8 | 91 |
| Feb | 1.48 | 2.52 | 2.13 | 0.81 | 4.8 | 89 |
| Mar | 2.62 | 4.17 | 2.72 | 1.43 | 6.4 | 85 |
| Apr | 4.18 | 5.97 | 3.76 | 2.10 | 9.2 | 82 |
| May | 4.91 | 7.37 | 3.93 | 2.46 | 12.4 | 80 |
| Jun | 5.37 | 7.92 | 3.93 | 2.79 | 15.5 | 79 |
| Jul | 5.16 | 7.48 | 3.91 | 2.63 | 17.7 | 78 |
| Aug | 4.30 | 6.27 | 3.51 | 2.23 | 17.6 | 79 |
| Sep | 3.27 | 4.68 | 3.37 | 1.67 | 15.2 | 82 |
| Oct | 1.85 | 2.94 | 2.40 | 1.00 | 12.0 | 86 |
| Nov | 0.97 | 1.65 | 1.75 | 0.54 | 8.2 | 91 |
| Dec | 0.63 | 1.12 | 1.47 | 0.35 | 5.5 | 93 |
GHI, Clear-sky, DNI, DHI in kWh/m²/day. Data: NASA POWER climatology (long-term monthly averages).
Off-grid calculator
Add appliances
- Add an appliance to size a system.
Sizing
- Daily load
- 0.00 kWh
- Panel wattage
- 0 W
- Panel count (400W modules)
- 0
- Battery bank
- 0.0 kWh
Sizing against worst-month PSH of 0.63 kWh/m²/day, 0.77 system efficiency.
About solar in Southend-on-Sea
Southend-on-Sea, United Kingdom has a temperate climate with meaningful seasonal variation in solar resource. Its annual peak sun hours average 2.96 kWh/m²/day, a modest solar resource by global standards.
The strongest month in Southend-on-Sea is June (summer) at 5.37 kWh/m²/day, and the weakest is December (winter) at 0.63 kWh/m²/day. When sizing a year-round off-grid system, it's standard practice to design against the December value rather than the annual average — otherwise the battery bank runs low during the darkest weeks.
Given the modest resource, Southend-on-Sea installations typically oversize panels or combine solar with another source (grid, generator, hydro) for reliability.
FAQ
- What are the peak sun hours in Southend-on-Sea?
- Southend-on-Sea averages 2.96 peak sun hours per day annually, ranging from 0.63 in December to 5.37 in June.
- How many solar panels do I need in Southend-on-Sea?
- Panel count depends on your daily load. At Southend-on-Sea's annual average of 2.96 kWh/m²/day, a 5 kWh/day load needs roughly 6 × 400 W panels. Use the calculator above for your actual load.
- What size battery do I need in Southend-on-Sea?
- Sizing against Southend-on-Sea's worst month (December, 0.63 kWh/m²/day) with 2 days of autonomy at 80% depth of discharge, a 5 kWh/day load needs about a 12.5 kWh battery bank.
- How does Southend-on-Sea's solar resource compare globally?
- Southend-on-Sea sits in solar zone 1 out of 5 (where 5 is strongest) at 2.96 kWh/m²/day — modest by global standards. For reference, top-tier desert sites average ~6.5 and high-latitude cities around 2.5 kWh/m²/day.
- How much does winter reduce solar output in Southend-on-Sea?
- Southend-on-Sea's worst month (December) delivers 0.63 kWh/m²/day — about 12% of the summer peak of 5.37. Off-grid systems here typically oversize 1.5–2× or pair with a backup source.
- Do cloudy days significantly affect Southend-on-Sea's solar?
- Partly. Diffuse light still produces 10–25% of clear-sky output. Southend-on-Sea's 2.96 kWh/m²/day already reflects average cloudiness, so no further derating is needed for sizing.
- What panel tilt works best in Southend-on-Sea?
- At Southend-on-Sea's latitude (52°), a fixed tilt near 52° balances year-round yield. Winter-heavy loads favor latitude + 15°; summer-heavy, latitude − 15°.