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Solar data for Taiwan

Across the 67 places in Taiwan the best fixed tilt for solar panels runs from 17° in Keelung to 21° in Chiayi City, and flat ground gets 3.7 to 4.6 peak sun hours a day. Every number is computed for each place.

Solar power in Taiwan at a glance

Averages over 67 places with climate data, for a fixed array facing south.

Best panel angle19°average, facing south
Peak sun hours4.14a day on flat ground
1 kWp makes1,256kWh a year at the best angle
Off-grid angle40°average, for the darkest month
TaipeiDonggang (most sun)
  • 3.74–3.91
  • 3.91–4.08
  • 4.08–4.25
  • 4.25–4.42
  • 4.42–4.59

Peak sun hours a day on flat ground. Each dot is one place.

The sunniest places in Taiwan, with 4.59 peak sun hours a day on flat ground, are Donggang and one other place; the least sunny is Sanzhi with 3.74. A 1 kWp array at its best angle makes from 1,122 kWh a year in Sanzhi to 1,390 kWh in Donggang — 1,256 kWh on average.

The best year-round tilt runs from 17° in Keelung to 21° in Chiayi City. Off-grid systems are sized for the darkest month and do better steeper, at 40° on average: at 70° that month brings 1.75 kWh per kWp a day in Chaozhou and 1.91 kWh in Magong.

Size an off-grid system or open any place below for its sun path, monthly table and tilt curve.

Sunniest places in Taiwan

Ranked by peak sun hours on flat ground: the yearly average of a day's sunshine energy (NASA POWER climatology). Output: 1 kWp at its best year-round angle.

RankPlaceRegionSun hours/daykWh per kWp a yearBest tilt
1DonggangTaiwan4.591,39019°
1HengchunTaiwan4.581,37317°
3KaohsiungTakao4.561,38319°
3FengshanTakao4.561,38319°
3ChaozhouTaiwan4.561,38219°
6TainanTaiwan4.481,36019°
7YongkangTaiwan4.471,35919°
8YujingTaiwan4.451,35820°
9XinyingTaiwan4.411,34420°
10BudaiTaiwan4.391,33519°

Least sunny places in Taiwan

RankPlaceRegionSun hours/daykWh per kWp a yearBest tilt
60KeelungTaiwan3.771,13217°
64TaipeiTaiwan3.761,13418°
64NeihuTaiwan3.761,13317°
64DanshuiTaipei3.761,13117°
67SanzhiTaipei3.741,12217°

Solar by region in Taiwan

Averages of the places in each region, sunniest first. Darkest month: what 1 kWp of off-grid panels at 70° makes a day in the worst month of the year.

RegionPlacesSun hours/daykWh per kWp a yearBest tiltDarkest month at 70°Sunniest place
Takao24.561,38319°1.78 kWhKaohsiung
Taiwan554.181,26819°1.85 kWhDonggang
Fukien24.161,27319°1.83 kWhJinhu
Taipei83.771,13818°1.83 kWhYingge

Largest places in Taiwan at a glance

PlaceLatitudeBest tiltOff-grid tiltSun hours/day (flat)
Taipei25.1° N18°45°3.76
New Taipei City25.1° N18°46°3.77
Taichung24.1° N19°42°4.15
Kaohsiung22.6° N19°37°4.56
Tainan23.0° N19°38°4.48
Banqiao25.0° N18°45°3.77
Taoyuan25.0° N18°43°3.81
Hsinchu24.8° N18°43°3.93
Keelung25.1° N17°42°3.77
Fengshan22.6° N19°36°4.56
Neihu25.1° N17°43°3.76
Chiayi City23.5° N21°32°4.37
Yongkang23.0° N19°38°4.47
Chang-hua24.1° N19°40°4.21
Changhua24.1° N19°40°4.22
Zhubei24.8° N18°43°3.91
Bade24.9° N18°43°3.82
Xizhi25.1° N17°43°3.77
Danshui25.2° N17°45°3.76
Shulin25.0° N18°43°3.78

Daylight and clock time in Taiwan

In Sanzhi (25.3° N), the northernmost place, the longest day of the year lasts 13 h 43 min and the shortest 10 h 34 min; in Hengchun (22.0° N), the southernmost, 13 h 29 min and 10 h 47 min. Taiwan does not use daylight saving time: the clocks stay the same all year.

Time zonePlacesUTC offsetClocks change in 2026
Asia/Taipei67UTC+8no daylight saving time

Questions about solar in Taiwan

What is the best angle for solar panels in Taiwan?
Facing south, between 17° and 21° depending on the place — 19° on average over 67 places. Off-grid systems that must get through the darkest month do better steeper, at about 40° on average.
How many peak sun hours does Taiwan get?
From 3.7 hours a day in Sanzhi to 4.6 in Donggang on flat ground, averaged over the year; 4.1 on average.
How much electricity does 1 kWp of solar panels produce in Taiwan?
About 1,256 kWh a year at the best fixed angle on average, from 1,122 kWh in Sanzhi to 1,390 kWh in Donggang. These are long-term climate averages; a single year can be several per cent higher or lower.
Where is the sunniest place in Taiwan?
Donggang (Taiwan) and 1 other place share the most sun of the 67 places: 4.59 peak sun hours a day on flat ground. 1 kWp in Donggang makes about 1,390 kWh a year.
Does Taiwan use daylight saving time?
Taiwan does not use daylight saving time: the clocks stay the same all year.
How long is the longest day in Taiwan?
13 h 43 min in Sanzhi; the shortest day lasts 10 h 34 min in Sanzhi.

All places in Taiwan