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Solar data for Bhutan

Across the 4 places in Bhutan the best fixed tilt for solar panels runs from 29° in Phuntsholing to 32° in Punākha, and flat ground gets 4.2 to 4.3 peak sun hours a day. Every number is computed for each place.

Solar power in Bhutan at a glance

Averages over 4 places with climate data, for a fixed array facing south.

Best panel angle31°average, facing south
Peak sun hours4.27a day on flat ground
1 kWp makes1,461kWh a year at the best angle
Off-grid angle8°average, for the darkest month
ThimphuPunākha (most sun)
  • 4.24–4.25
  • 4.25–4.27
  • 4.27–4.29
  • 4.29–4.31
  • 4.31–4.32

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

The sunniest place in Bhutan is Punākha (Punakha) with 4.32 peak sun hours a day on flat ground; the least sunny is Tsirang with 4.24. A 1 kWp array at its best angle makes from 1,418 kWh a year in Phuntsholing to 1,517 kWh in Punākha — 1,461 kWh on average.

The best year-round tilt runs from 29° in Phuntsholing to 32° in Punākha. Off-grid systems are sized for the darkest month and do better steeper, at 8° on average: at 70° that month brings 1.83 kWh per kWp a day in Phuntsholing and 2.05 kWh in Punākha.

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

Largest places in Bhutan at a glance

PlaceLatitudeBest tiltOff-grid tiltSun hours/day (flat)
Thimphu27.5° N31°9°4.25
Phuntsholing26.9° N29°7°4.27
Tsirang27.0° N30°6°4.24
Punākha27.6° N32°10°4.32

Daylight and clock time in Bhutan

In Punākha (27.6° N), the northernmost place, the longest day of the year lasts 13 h 53 min and the shortest 10 h 24 min; in Phuntsholing (26.9° N), the southernmost, 13 h 50 min and 10 h 27 min. Bhutan does not use daylight saving time: the clocks stay the same all year.

Time zonePlacesUTC offsetClocks change in 2026
Asia/Thimphu4UTC+6no daylight saving time

Questions about solar in Bhutan

What is the best angle for solar panels in Bhutan?
Facing south, between 29° and 32° depending on the place — 31° on average over 4 places. Off-grid systems that must get through the darkest month do better steeper, at about 8° on average.
How many peak sun hours does Bhutan get?
From 4.2 hours a day in Tsirang to 4.3 in Punākha on flat ground, averaged over the year; 4.3 on average.
How much electricity does 1 kWp of solar panels produce in Bhutan?
About 1,461 kWh a year at the best fixed angle on average, from 1,418 kWh in Phuntsholing to 1,517 kWh in Punākha. These are long-term climate averages; a single year can be several per cent higher or lower.
Where is the sunniest place in Bhutan?
Punākha (Punakha) gets the most sun of the 4 places: 4.32 peak sun hours a day on flat ground, so 1 kWp there makes about 1,517 kWh a year.
Does Bhutan use daylight saving time?
Bhutan does not use daylight saving time: the clocks stay the same all year.
How long is the longest day in Bhutan?
13 h 53 min in Punākha; the shortest day lasts 10 h 24 min in Punākha.

All places in Bhutan

Punakha

Thimphu District

Tsirang District