Peak Sun Hours in Rostov-on-Don, Rostov, Russia
- Solar zone
- Zone 2 (moderate)
- Best month
- June (6.5)
- Worst month
- December (0.8)
- Climate
- Temperate · 10.8°C
Monthly solar breakdown
| Month | GHI | Clear-sky | DNI | DHI | Temp °C | Humid % |
|---|---|---|---|---|---|---|
| Jan | 0.95 | 1.87 | 1.32 | 0.59 | -3.3 | 90 |
| Feb | 1.80 | 3.01 | 2.08 | 1.01 | -2.3 | 88 |
| Mar | 2.96 | 4.51 | 2.72 | 1.58 | 3.3 | 79 |
| Apr | 4.63 | 6.24 | 4.24 | 2.09 | 10.0 | 72 |
| May | 6.01 | 7.53 | 5.33 | 2.51 | 17.3 | 67 |
| Jun | 6.52 | 8.01 | 5.63 | 2.67 | 22.4 | 58 |
| Jul | 6.37 | 7.58 | 5.65 | 2.53 | 25.5 | 51 |
| Aug | 5.76 | 6.55 | 5.89 | 2.06 | 25.2 | 46 |
| Sep | 4.15 | 5.07 | 4.88 | 1.56 | 18.7 | 56 |
| Oct | 2.41 | 3.40 | 3.21 | 1.08 | 10.7 | 70 |
| Nov | 1.21 | 2.07 | 1.83 | 0.65 | 3.6 | 83 |
| Dec | 0.78 | 1.53 | 1.25 | 0.48 | -1.3 | 89 |
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 0.78 kWh/m²/day, 0.77 system efficiency.
About solar in Rostov-on-Don
Rostov-on-Don, Russia has a temperate climate with meaningful seasonal variation in solar resource. Its annual peak sun hours average 3.63 kWh/m²/day, a moderate solar resource by global standards.
The strongest month in Rostov-on-Don is June (summer) at 6.52 kWh/m²/day, and the weakest is December (winter) at 0.78 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 moderate resource, Rostov-on-Don installations typically oversize panels or combine solar with another source (grid, generator, hydro) for reliability.
FAQ
- What are the peak sun hours in Rostov-on-Don?
- Rostov-on-Don averages 3.63 peak sun hours per day annually, ranging from 0.78 in December to 6.52 in June.
- How many solar panels do I need in Rostov-on-Don?
- Panel count depends on your daily load. At Rostov-on-Don's annual average of 3.63 kWh/m²/day, a 5 kWh/day load needs roughly 5 × 400 W panels. Use the calculator above for your actual load.
- What size battery do I need in Rostov-on-Don?
- Sizing against Rostov-on-Don's worst month (December, 0.78 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 Rostov-on-Don's solar resource compare globally?
- Rostov-on-Don sits in solar zone 2 out of 5 (where 5 is strongest) at 3.63 kWh/m²/day — moderate 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 Rostov-on-Don?
- Rostov-on-Don's worst month (December) delivers 0.78 kWh/m²/day — about 12% of the summer peak of 6.52. Off-grid systems here typically oversize 1.5–2× or pair with a backup source.
- Do cloudy days significantly affect Rostov-on-Don's solar?
- Partly. Diffuse light still produces 10–25% of clear-sky output. Rostov-on-Don's 3.63 kWh/m²/day already reflects average cloudiness, so no further derating is needed for sizing.
- What panel tilt works best in Rostov-on-Don?
- At Rostov-on-Don's latitude (47°), a fixed tilt near 47° balances year-round yield. Winter-heavy loads favor latitude + 15°; summer-heavy, latitude − 15°.