Power from
your own roof
Aruna designs, installs and maintains rooftop solar for more than 340 factories and businesses. Enter your power bill to see what you would save and how fast it pays back.
- ISO 9001 · ISO 45001
- ERC-registered contractor
- 25-year care
Your building
Estimated saving฿2,699,200a year · ฿224,933 a month
- Recommended system
- 482 kWp
- Estimated investment
- ฿12,532,000
- Payback
- 4.7 yrs (4.4–5.1)
- CO₂ avoided
- 320.5 t/yr
- Net gain over 25 years
- ฿64,376,521
limited by roof area · Needs about 3,133 m² of roof. Based on a tariff of 4 THB/kWh
Get a quote on these numbers340+systems installed and maintained
86 MWptotal capacity
58,000 tCO₂ avoided a year
0lost-time incidents in 2025
Solutions for every roof
All solutions
Factory rooftop solarCut daytime power costs when factories use the most, with typical payback in 4–6 years
Commercial buildingsMalls, hotels and offices: lower bills and green-building credits
Home solar3–10 kW systems installed in a day, with grid export paperwork done
Solar farms and PPADesign and construction of megawatt-scale solar farms
Operations and maintenancePanel cleaning, thermal inspection and monthly reports
Battery storageStore power for peaks and evenings and cut demand charges
Recent projects
Production and savings figures come from each project’s monitoring system
Factories998 kWp rooftop for Siam Coldchain
Samut Sakhon · 2025
- System
- 998 kWp
- Saving/yr
- ฿5.9M
- CO₂/yr
- 664 t
Factories2.4 MWp distribution centre
Chonburi · 2025
- System
- 2.4 MWp
- Saving/yr
- ฿11.8M
- CO₂/yr
- 1,596 t
Factories1.6 MWp food plant under a PPA
Nakhon Pathom · 2024
- System
- 1.62 MWp
- Saving/yr
- ฿8.7M
- CO₂/yr
- 1,077 t
Our bill dropped from the first month and we see the numbers every day on our phones.
From your power bill to first power
- Site survey
Drone roof survey, structural check and 12 months of load analysis
Week 1 - Design and proposal
Production simulation, with self-funded and PPA options compared
Week 2 - Permits
ERC, utility and factory licence filings
4–8 weeks - Installation
Our own crews, without stopping your production
2–10 weeks - Ongoing care
Monitored from our control room, reported monthly
25 years
