How much electricity do solar panels make in Lanzhou, People's Republic of China?
≈ 6,319 kWh a year
In Lanzhou, People's Republic of China, ten 400 W mono PERC solar panels (4 kWp) on a roof facing the equator at the best yearly tilt (30°) make about 6,319 kWh of electricity a year — 1,580 kWh for every installed kilowatt.
1,580 kWh/kWpspecific yield per year
30°best yearly panel tilt
1,626 kWh/m²yearly sunlight on level ground
Maybest month (September lowest)
Solar energy month by month in Lanzhou
| Month | 4 kWp system (kWh) | per kWp (kWh) |
|---|---|---|
| January | 490 | 122 |
| February | 489 | 122 |
| March | 590 | 148 |
| April | 587 | 147 |
| May | 593 | 148 |
| June | 543 | 136 |
| July | 549 | 137 |
| August | 534 | 134 |
| September | 454 | 114 |
| October | 495 | 124 |
| November | 495 | 124 |
| December | 500 | 125 |
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.
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