How much electricity do solar panels make in Sofia, Bulgaria?
≈ 5,378 kWh a year
In Sofia, Bulgaria, ten 400 W mono PERC solar panels (4 kWp) on a roof facing the equator at the best yearly tilt (30°) make about 5,378 kWh of electricity a year — 1,345 kWh for every installed kilowatt.
1,345 kWh/kWpspecific yield per year
30°best yearly panel tilt
1,405 kWh/m²yearly sunlight on level ground
Julybest month (December lowest)
Solar energy month by month in Sofia
| Month | 4 kWp system (kWh) | per kWp (kWh) |
|---|---|---|
| January | 276 | 69 |
| February | 327 | 82 |
| March | 445 | 111 |
| April | 501 | 125 |
| May | 555 | 139 |
| June | 578 | 145 |
| July | 624 | 156 |
| August | 602 | 150 |
| September | 495 | 124 |
| October | 423 | 106 |
| November | 301 | 75 |
| December | 251 | 63 |
How these numbers were calculated
NASA POWER long-term monthly means on a 1° grid around the city, the monthly method of Duffie & Beckman (isotropic sky, each month's average day), panel temperature from NOCT, 10 % other losses and a 96 % inverter. No shading, snow or product-specific data; expect ±10 % against a detailed tool such as PVGIS. To change the number of panels, their rating, tilt, direction or your roof size, use Blorp's free solar roof tool — every result shows its equation and the numbers used.