Solar panels in Osaka
A 6 kWp home system in Osaka is modelled to produce about 7,795 kWh a year, or 1,299 kWh per installed kWp, from PVGIS climate data at the city's coordinates. Osaka City ran a residential solar subsidy from FY2009 to FY2011 but stated in September 2025 that it does not currently offer one, pointing residents to the joint group-purchase scheme instead. The page lists 2 local rules, each checked against its official source. Among our 2 Japan cities, Osaka comes first on yield. For comparison, Tokyo reaches 1,240. Compared with the Japan reference point on our country page, Osaka produces 5% more per kWp.
Month by month in Osaka
Modelled output of a 6 kWp system at 35° facing south (towards the equator), from PVGIS climate data (PVGIS-ERA5, 2005 to 2023).
| Month | kWh | Share of year |
|---|---|---|
| January | 663 | 8.5% |
| February | 643 | 8.2% |
| March | 765 | 9.8% |
| April | 727 | 9.3% |
| May | 706 | 9.1% |
| June | 577 | 7.4% |
| July | 590 | 7.6% |
| August | 669 | 8.6% |
| September | 594 | 7.6% |
| October | 634 | 8.1% |
| November | 598 | 7.7% |
| December | 631 | 8.1% |
- Best month: March (765 kWh). Weakest: June (577 kWh), a 1.3x difference.
- March, April, May produce 28.2% of the year; June, July, September produce 22.6%.
- Year-to-year variation: about 207 kWh (2.6%, one standard deviation).
- Sunlight reaching the panels: 1,719 kWh per m² a year.
Local rules and support in Osaka
Rules set by the city or its region, on top of the national scheme. Each one was checked against the official source on the date shown.
- Osaka Prefecture and City
Osaka solar and battery group purchase
Osaka Prefecture, with Osaka City through the Osaka Smart Energy Center, runs a group-purchase scheme for solar panels and batteries open to residents across the prefecture. FY2026 registration runs from 18 March to 30 September 2026.
Source: 大阪府 (Osaka Prefectural Government), 太陽光発電及び蓄電池システムの共同購入支援事業 (checked 2026-09-25)
- City of Osaka
No Osaka City residential solar subsidy
Osaka City ran a residential solar subsidy from FY2009 to FY2011 but stated in September 2025 that it does not currently offer one, pointing residents to the joint group-purchase scheme instead.
Source: 大阪市 (City of Osaka), 太陽光発電システム等の補助金について (市民の声, 2025年10月31日公表) (checked 2026-09-25)
How Osaka compares
Osaka ranks 1 of 2 for yield among the cities we model in Japan, and 20 of 41 across every country on Solar Figures. Within one country the prices are the same, so a payback gap between these cities comes from sunshine alone.
| City | kWh per kWp / yr | Payback (JPY) |
|---|---|---|
| Osaka | 1,299 | 10.7 yrs |
| Tokyo | 1,241 | 12.6 yrs |
| National reference point (country page) | 1,239 | 12.6 yrs |
Closest yield abroad: Milan (1,298 kWh per kWp), São Paulo (1,293 kWh per kWp), Rio de Janeiro (1,340 kWh per kWp).
What moves the payback in Osaka
Power you use yourself is worth the retail price (¥31 per kWh); power you export earns ¥14.58. So the share you use at home, by running appliances in daylight or adding a battery, changes the payback. The system cost stays the same in every row (a battery would add to it).
| Used at home | Year-1 savings | Payback |
|---|---|---|
| 20% | ¥137,854 | 13.4 yrs |
| 30% (our default) | ¥150,525 | 10.7 yrs |
| 50% | ¥175,867 | 8.9 yrs |
| 70% | ¥201,209 | 7.7 yrs |
- Net system cost after incentives: ¥1,500,000 for 6 kWp.
- Incentive modelled: No national capital grant -- support is the FIT export tariff (municipal subsidies vary, not modelled).
- 25-year net savings at our default: ¥3,504,963.
Best panel angle in Osaka
At latitude 34.69°N, PVGIS finds the fixed tilt and direction that maximise yearly output. Our figures use a common 35° roof; the table shows what the optimum adds.
| Setup | Tilt | Facing | kWh per kWp / yr |
|---|---|---|---|
| Standard roof (used on this page) | 35° | south | 1,299 |
| PVGIS optimum | 36° | south (175°) | 1,300 |
The optimum adds 0.1% a year over the standard roof in Osaka. Most of a roof's value comes from its direction: a roof facing away from the equator loses far more than a few degrees of tilt.
See the full Japan picture on our Japan solar page, or the national incentives in our Japan solar guide.
Sources and method
Figures computed 2026-09-25 for a 6 kWp system, 35° tilt, 14% system losses, terrain shading on. An estimate, not a quote: your installer's quote will be exact.
- PVGIS 5.3 PVcalc (PVGIS-ERA5), European Commission JRC (checked 2026-09-25)
- Japan tariff and incentive inputs (see DATA_SOURCES.md) (checked 2026-06-21)
- 大阪府 (Osaka Prefectural Government): 太陽光発電及び蓄電池システムの共同購入支援事業 (checked 2026-09-25)
- 大阪市 (City of Osaka): 太陽光発電システム等の補助金について (市民の声, 2025年10月31日公表) (checked 2026-09-25)
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