Solar Panel Angle Guide
Solar Panel Angle in Tokyo
Tokyo, Japan is at latitude 35.68°N. Here's the optimal solar panel tilt and orientation for maximum energy production.
Year-Round Tilt
34.1°
Summer Tilt
20.7°
Winter Tilt
50.7°
Face
South
180° azimuth
Monthly Optimal Tilts for Tokyo
Jan
56.0°
Feb
47.4°
Mar
35.7°
Apr
24.0°
May
15.4°
Jun
12.2°
Jul
15.4°
Aug
24.0°
Sep
35.7°
Oct
47.4°
Nov
56.0°
Dec
59.1°
Peak Sun Hours
4.5 hrs/day
Average daily solar insolation
Annual Production (400W panel)
~657 kWh
At 34.1° tilt, facing South
Solar Panel Recommendations for Tokyo
- Fixed mount: Set your panels at 34.1° tilt, facing South (180° azimuth).
- Seasonal adjustment: Tilt to 20.7° in summer and 50.7° in winter for up to 15% more annual energy.
- Monthly adjustment: Adjust tilt each month using the table above for maximum year-round production.
Solar Energy Challenges in Tokyo
Tokyo receives approximately 4 peak sun hours daily, consistent with its latitude of 35.7°N. The humid subtropical climate produces hot, humid summers and mild winters, with a rainy season (tsuyu) in June-July that significantly reduces early-summer generation. Typhoon season from August to October brings high winds and heavy rain that temporarily disrupt production.
Japan's Feed-in Tariff (FIT) program has historically driven substantial solar adoption, though tariff rates have declined over time. Tokyo Electric Power Company (TEPCO) offers net metering for residential solar customers. Japan's high electricity rates and the post-Fukushima push for renewable energy continue to support the solar market.
Space constraints are the primary challenge for Tokyo solar. The city's dense urban environment means many homes have limited roof area, and shading from neighboring buildings is a common issue. Typhoon wind loads must be factored into racking specifications, and seismic considerations (Tokyo is in an active earthquake zone) require reinforced mounting systems. Many Tokyo homeowners use solar primarily for partial offset rather than full coverage.
Orientation Performance
Panel orientation significantly affects energy production. The table below shows relative output compared to true south-facing panels:
| Orientation | Relative Output |
|---|---|
| South | 100% |
| South-East | 96% |
| South-West | 96% |
| East | 85-90% |
| West | 85-90% |
| North | 60-75% |
Frequently Asked Questions
Is solar viable in Tokyo?
Tokyo averages 4 peak sun hours. Japan's FIT program has driven significant solar adoption. Limited roof space and typhoon risk are key considerations for Tokyo installations.
How much energy can a 400W panel generate here?
With 4.5 peak sun hours per day, a properly aligned 400W panel could generate approximately 657 kWh per year.
Related Calculators
Solar Panel Tilt Calculator
Calculate optimal tilt for any latitude and month
Solar Panel Azimuth Calculator
Find the exact compass heading for your panels
Get exact numbers with the SolarAlign app
Use your phone to align panels in real-time with live sensor feedback.Learn more →