Solar Cell · Limitless Energy by ONVALLA
Solar Cell Systems for Factories, Buildings and Homes in Thailand
Lower your electricity costs with a solar PV system designed for your site. We handle consultation, design, permits, installation, monitoring and after-sales service.
16,724 kW
Solar capacity installed, 2021–2025
29,635
Solar panels installed
27,469 MWh
Electricity generated per year
19.23 kt
CO₂ emissions reduced per year
Solar energy
What Is a Solar Cell System?
A solar cell (photovoltaic, PV) system converts sunlight into electricity. The panels produce direct current (DC), and an inverter converts it into alternating current (AC) for the building’s everyday loads.
Most businesses use electricity during the day, when solar generation peaks, so a rooftop system can supply a large part of daytime demand.
Key facts
- Main parts: solar modules, inverter, mounting structure, DC/AC cabling, protection devices and, for hybrid systems, batteries.
- System types: on-grid, off-grid and hybrid.
- Suitable for: factories, warehouses, offices, commercial buildings and homes.
Lower electricity costs
Use your own solar power during the day and buy less from the grid.
Long-term investment
A system planned around your load, roof and investment goals.
Reduced carbon emissions
Every kWh you generate replaces grid electricity.
Clean, renewable energy
Sunlight is a free, renewable source of energy.
System types
On-Grid, Off-Grid or Hybrid?
Solar PV systems come in three main configurations to suit different energy needs and sites.
Connected to the utility grid
On-Grid Solar System
The inverter converts DC into AC and supplies the building directly, with the grid always connected.
- Continuous power supply from solar plus grid
- Reduces monthly electricity costs
- Residential systems can export excess electricity to the grid
Best for: factories, offices and homes that mainly want to cut electricity bills.
Independent power generation
Off-Grid Solar System
Operates with no connection to the utility grid, usually with batteries to store energy.
- No grid connection required
- Works with batteries for energy storage
- Suitable for standalone applications
Best for: remote sites without a reliable grid connection.
Reliable energy with battery backup
Hybrid Solar System
Combines the advantages of on-grid and off-grid systems in one installation.
- Stores excess solar energy in batteries
- Backup power during grid outages
- Seamless power transition
Best for: sites that need backup power or more energy independence.
Product portfolio
Reliable Products for Every Solar Project
We select modules, inverters and accessories for each project and install them as one complete system.
Solar PV module · Tier 1
Trina Solar
A provider of smart solar energy solutions: modules, power generation systems, microgrids and energy cloud platforms. It was the first solar company listed on the STAR Market of the Shanghai Stock Exchange.
Inverter & battery · Authorized dealer
SolaX Power
Energy storage specialist with 243 patents and more than 1,100 certifications worldwide, according to SolaX.
- Residential energy storage inverters with battery storage and smart monitoring
- Commercial & industrial inverters
Inverter & energy storage
Huawei
Solar inverters and energy storage for commercial and industrial sites.
Inverter & optimizer
SolarEdge
Inverters with module-level power optimizers and monitoring.
Accessories and Balance of System
The quality of the accessories decides how safely and efficiently the whole system runs.
- Rapid shutdown devices and power optimizers: fire-prevention protection with module-level monitoring.
- Solar, DC and AC cables: including string harnesses, carrying power from the panels to the inverter.
- Mounting: rails, rail joints, mid and end clamps, grounding plates and lugs, cable clips.
- Roof options: Kliplok, trapezoidal and tile roofs, with tile brackets, hanger bolts and stud bolts.
Brand descriptions are summarized from manufacturer information. Brand names and logos belong to their owners.
Smart monitoring
Monitor Your Solar System Anytime, Anywhere
Real-time monitoring shows system performance, energy production and operating status on an easy web and mobile platform.
Real-time monitoring
Track system performance as it happens.
Energy statistics
View daily, monthly and lifetime energy data.
Remote access
Check your system from anywhere, at any time.
Instant alerts
Get notified about system events and issues.
Web & mobile
Use a computer or a mobile device.
Secure cloud platform
Cloud-based, with data security built in.
Data export
Export data and reports for analysis and records.
Multi-site management
Monitor several plants on one platform.
Our service process
From Planning to Long-Term Support
We support every stage of your solar project, from the first consultation to after-sales service.
- System consultation Identify your requirements and recommend the best solar solution.
- Site survey Assess site conditions and installation feasibility.
- Design & installation planning Develop the system design and installation plan.
- Investment planning Analyze investment, ROI and expected energy savings.
- Installation Install the complete solar PV system.
- Permits & regulatory approvals Handle all required permits and approvals.
- Testing & commissioning Verify safety, function and performance before handover.
- Monitoring & after-sales service Corrective and preventive maintenance, monitoring and technical support.
Business models
Flexible Solutions for Every Business
Choose the model that best fits your project and investment strategy.
EPC
Complete engineering, procurement and construction for homes, offices, warehouses, factories and other commercial buildings.
PPA
Power purchase agreement, available for projects from 250 kWp.
Leasing
In partnership with financial institutions, for residential to commercial and industrial projects.
Retail
Solar panels, inverters and accessories for your own installation team.
Our installation impact
Solar Systems We Installed, 2021–2025
Combined figures for the solar PV systems Limitless Energy installed between 2021 and 2025.
16,724 kW
Solar capacity installed (29,635 panels)
27,469 MWh/year
Electricity generated
19.23 ktCO₂/year
CO₂ emissions reduced
874,025 trees/year
Tree equivalent
Figures from ONVALLA’s installation records. Generation and CO₂ values are yearly estimates for the installed systems.
Project references
Solar Projects Across Thailand
Every project starts from the site, the energy use pattern and the customer’s goals.
Rayong · 2022
1,760.35 kWp rooftop
Samut Sakhon
1,532.16 kWp rooftop
Samut Sakhon · 2022
999.53 kWp rooftop
Chachoengsao · 2022
740.43 kWp rooftop
Bangkok · 2022
719.40 kWp rooftop
Prachin Buri · 2024
475.24 kWp rooftop
Bangkok · 2023
10.36 kWp home system
Our customers
Organizations That Trust Our Solar Solutions
Delivering reliable solar energy solutions for organizations across diverse sectors.
Knowledge
Learn More About Solar
FAQ
Solar Cell FAQ
What is the difference between on-grid, off-grid and hybrid solar systems?
An on-grid system works with the utility grid and mainly reduces electricity bills. An off-grid system runs without the grid, usually with batteries. A hybrid system combines grid connection with battery storage, so it can supply backup power during outages.
Which solar brands does ONVALLA use?
Trina Solar Tier 1 modules, and inverters and batteries from SolaX Power (ONVALLA is an authorized dealer), Huawei and SolarEdge.
Does ONVALLA install solar for both homes and businesses?
Yes. Our references range from a 10.36 kWp home system to rooftop systems of more than 1,700 kWp for factories and buildings.
Can ONVALLA handle the permits?
Yes. Permits and regulatory approvals are part of our service process, together with design, installation, testing and commissioning.
Can I monitor my solar system?
Yes. The monitoring platform shows real-time performance, daily, monthly and lifetime energy data and alerts on web and mobile, and can manage several sites in one place.
Do I have to buy the system outright?
No. Besides EPC purchase, we offer PPA for projects from 250 kWp and leasing through partner financial institutions.
Find Out What Solar Can Save You
Send us your electricity bills and site details. Our team will check your roof, size the system and prepare a quotation with estimated savings.
Sales
(+66) 02-193 5380-5 · info@onvalla.com
Service
(+66) 091-771 0311-13 · LINE @onvalla