How much electricity do solar panels make in Tokyo, Japan?
≈ 5,373 kWh a year
In Tokyo, Japan, ten 400 W mono PERC solar panels (4 kWp) on a roof facing the equator at the best yearly tilt (30°) make about 5,373 kWh of electricity a year — 1,343 kWh for every installed kilowatt.
1,343 kWh/kWpspecific yield per year
30°best yearly panel tilt
1,407 kWh/m²yearly sunlight on level ground
Marchbest month (November lowest)
Solar energy month by month in Tokyo
| Month | 4 kWp system (kWh) | per kWp (kWh) |
|---|---|---|
| January | 458 | 115 |
| February | 430 | 107 |
| March | 505 | 126 |
| April | 501 | 125 |
| May | 503 | 126 |
| June | 424 | 106 |
| July | 450 | 113 |
| August | 493 | 123 |
| September | 415 | 104 |
| October | 393 | 98 |
| November | 382 | 95 |
| December | 419 | 105 |
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.