Frequently asked questions (FAQ)

A solar cell is an electronic device that converts energy from sunlight into electricity. Solar energy is considered the best clean, natural energy: besides saving money and reducing environmental problems, solar is a "survival energy" that can help solve the energy crisis the world faces today. It is truly accessible to everyone and can be used without limit, with no impact on nature or living things. That's why solar is key to SDG 7, Affordable and Clean Energy, which aims to get everyone using clean energy so every part of the world can escape the energy crisis and access electricity sustainably at a fair price

Today, solar panels are mostly made from silicon (Si), the cheapest and most abundant material on Earth, which is processed scientifically into thin, pure wafers — the key material in solar panels. Other materials can also be used to make solar cells, such as Gallium Arsenide, Indium Phosphide, Cadmium Telluride and Copper Indium Diselenide

A solar panel has 2 layers:

1) N-Type: a silicon wafer doped with phosphorus, which makes it release electrons when it receives energy from sunlight

2) P-Type: a silicon wafer doped with boron, which leaves its atomic structure short of electrons (holes); when it receives energy from sunlight it acts as an electron acceptor. Joining the two types with a p–n junction creates a "solar cell"

How a solar panel works: when sunlight hits the panel, it transfers energy to the electrons and holes, setting them in motion. The electrons gather at the Front Electrode and the holes at the Back Electrode, and when the circuit is complete, an electric current is produced that we can use

When sunlight hits the solar panels, light energy is converted into direct current (DC), which passes through the inverter to become alternating current (AC). This is fed into the building's main distribution board (MDB), where it blends with grid power and flows automatically to your appliances

No. Because the installed system is connected to the utility grid (On-Grid), the inverter shuts down automatically when the power goes out. This protects utility workers repairing the lines: if the system kept running, the electricity it produces could flow back into the grid and endanger the workers fixing it

It is the connection between the Metropolitan or Provincial Electricity Authority's grid and the solar power system on your roof. Because electricity is a regulated form of energy, the relevant government agencies must be notified in line with official rules and regulations

Solar can be installed on all roof types except corrugated metal sheets and Roman Tile roofs over 10 years old. Roofs steeper than 60 degrees are not recommended

Normally, rain and the tilt of the installation wash dust off naturally. If you want to clean the panels yourself, simply spray water as a fine mist like rain, only over the tempered glass, avoid spraying underneath the panels, and wash when the sun isn't out
Throughout the project contract, the company will also send staff to inspect and maintain the equipment at least twice a year

Anything that reduces light intensity, such as shade, clouds, dust, leaves and the installation angle. Throughout the project contract, the company will send staff to inspect and maintain the equipment at least twice a year

Solar panels typically carry a manufacturer's warranty of 30 years with at least 80% efficiency. Beyond 30 years, efficiency declines with age and maintenance

Anywhere with sunlight. The most popular options are ground-mounted and rooftop systems, plus carports and canopies — and today there is also floating solar on water

For maximum performance, face the panels south at a 10–15 degree tilt. Avoid facing them north unless necessary, and install them where trees or buildings won't cast shade

With today's technology, batteries can store solar electricity for use at night. If you want a 100% self-sufficient system, you'll need more panels to produce enough power and a battery large enough to store it — just as a heavy phone user who needs it all day needs a big power bank. However, large storage batteries are still very expensive

It's possible if the installation isn't designed properly. That's why you should use a standards-compliant installer, and an engineer should survey the building structure before installation to design for your structure and roof type. The installation should also leave enough roof space to reach the panels for future maintenance

A 1-kilowatt solar system (10 panels of 120 × 60 cm) produces 1,300 kWh/yr (units per year)

Greenhouse gas calculation: GHG emissions = Activity Data × Emission Factor

= 1,300 kWh × 0.6933 kgCO2e/kWh

= 901.3 kgCO2e

So a 1-kilowatt solar system cuts greenhouse gas emissions by 901.3 kgCO2e a year — equivalent to planting about 101 trees (one mature tree absorbs about 8 kg of carbon dioxide a year)

Popular system sizes on the market start at around 3 kWp. To get the best value, the system shouldn't be larger than your daytime base load, so you can use the electricity it produces efficiently

Solar installations also have fixed costs, such as installation labor, that don't change with size. Systems under 3 kWp can still be installed, but the average cost per kWp will be higher

Maintenance costs, such as panel cleaning or inverter replacement, vary depending on usage conditions and the equipment you choose

Yes. Solar genuinely cuts electricity bills, depending on the system size and output. Solar generates power for daytime use and can cut your bill by 40–80% a month

For rooftop solar, the installer is responsible for applying for permission and making sure the installed capacity doesn't exceed the local transformer's capacity

A solar system produces power according to light intensity. With suitable light intensity it runs at full efficiency, which isn't necessarily about how strong the sun feels

A solar installation typically pays back in 3–6 years, depending on factors such as your electricity use and any support your business receives — for example special interest rates from financial institutions or Board of Investment (BOI) incentives, which can effectively cut the investment by up to 50%

Currently, the government buys surplus electricity only from residential systems with an installed capacity of no more than 10 kilowatts

There are 2 types of maintenance: preventive maintenance and corrective maintenance. Both should be carried out by experts so the solar system runs at full efficiency throughout its lifetime

Solar systems are designed with lightning protection according to engineering principles. The chance of a strike is the same as anywhere else — installing solar doesn't increase it, because solar panels aren't lightning rods. The installation also includes earthing to protect against lightning

Rooftop solar won't make your building hotter. It actually helps lower indoor temperatures and reduces air-conditioning load, because the panels are the first surface the sun hits and filter part of the light before heat reaches the roof

1) It's a technology that generates electricity without burning fossil fuels, so it emits very little CO2 over its lifetime
2) Solar energy never runs out
3) Solar is clean, accessible to everyone and a modern technology
4) Rooftop solar generates electricity and cuts your power bill
5) Electricity from solar doesn't pollute the air (Zero Emission)

10-year inverter warranty, 30-year solar panel warranty and 2-year workmanship warranty

It depends on the system size, starting at about 18 m² for a 3.3 kW system

Call 090-456-6646 or visit evpowerenergy.com

Yes — 2 years of free system checks, 2 years of free panel cleaning and a 2-year workmanship warranty

Installments are available through an ICBC bank loan, with these basic conditions

1) The borrower must not have a negative credit bureau record

2) A regular income of at least 20,000–30,000 baht a month

3) The installation site must have a land title deed

Applicants with a negative credit record don't qualify for installments but can pay by credit card

Our service is a Solar Rooftop system that covers electricity use throughout the home, starting at 3 kW

Yes. We recommend an Off-Grid system, which doesn't rely on utility power lines. Packages start at about 250,000 baht

EV Power Energy Co., Ltd. has 2 offices:

Head office: 129 Moo 5, Chiang Mai–Hang Dong Rd., Mae Hia, Mueang, Chiang Mai 50100

Bangkok office: 30 Soi Sukhumvit 61 (Sethabutr), Khlong Tan Nuea, Watthana, Bangkok 10110

EV Power Energy Co., Ltd.'s own installation team — not outside contractors

There are 2 options

1) Sales agent: refer customers to install with the company

2) Equipment dealer: buy products from the company at member prices and resell them

It's a Solar Rooftop system that covers electricity use throughout the home and works with every type of appliance

A Solar PPA (power purchase agreement) is a model where EV Power Energy invests in the entire solar installation for free — from design and installation to the government permit paperwork — so the customer doesn't invest a single baht. You simply pay for the electricity the solar system produces at the contract price, which is cheaper than utility power, and when the contract ends you own 100% of the solar system

Benefits of a Solar PPA

1) Permits handled for free

2) Zero installation investment

3) Buy solar power at a lower price than utility electricity

4) Own the solar system for free when the contract ends

5) Free maintenance for the full contract term

Sigenergy is a clean energy technology company from China, founded by executives and engineers formerly with Huawei, CATL and Tesla, with long experience in solar, batteries and smart energy management

Sigenergy is an All-in-One system that combines solar + battery + EV charger + AI under one brand, unlike Huawei or Sungrow, where the components are separate, or Atmoce, which isn't yet a complete solution. That makes Sigenergy easy to use, safe, well designed and great value in the long run

Sigenergy uses LiFePO4 batteries, which are very safe, long-lasting and not easily flammable. They are certified to international CE, TÜV, VDE and UL standards and have multi-layer protection (BMS) for both electrical and thermal safety

Yes. EV Power Energy is Sigenergy's official installation and after-sales service partner in Thailand, with technicians and spare parts on hand and warranty coverage for both equipment and installation

Sigenergy inverter: 10-year warranty

Sigenergy DC charger: 2-year warranty

LiFePO4 battery (SigenStor): 10 years or about 10,000 charge cycles

Installation by EV Power Energy: 2-year warranty

With Huawei, the inverter, battery and EV charger are separate units connected together, whereas Sigenergy combines everything in one system (inverter, DC EV charger, PCS, battery pack, EMS) — a 5-in-1 energy storage innovation

Sigenergy is designed to be premium and durable, built from industrial-grade materials with IP65 water and dust protection for outdoor use, plus smart cooling suited to Thailand's climate

Customers get an expert team, guaranteed quality, app-based monitoring, free maintenance in the first year and other add-on services from EV Power Energy

Yes. EV Power Energy has started installing Sigenergy and is gathering reviews and reference sites so customers can see real installations

Sungrow is a Chinese inverter and energy storage brand founded in 1997 and one of the world's largest manufacturers, with more than 400 gigawatts installed in over 150 countries. It meets international CE, TÜV and UL standards, so you can be confident in both quality and safety

1) High efficiency — some inverter models reach up to 98.4% efficiency, reducing energy losses

2) Modern technology — new models connect to the Sungrow iSolarCloud app for real-time monitoring

3) Easy to use — an intuitive interface and convenient Plug & Play installation

4) High safety — reverse current protection, automatic shutdown in emergencies and short-circuit protection

5) Weather resistant — many models are IP65-rated for outdoor installation, suited to Thailand's hot, humid climate

6) Many sizes — from small homes to large businesses and factories

Sungrow's strength is value, suitable for homes, factories and large projects

Huawei focuses on cutting-edge technology and a strong brand

Sigenergy is All-in-One, covering solar, battery and EV charger with a premium design

Atmoce is a micro-inverter from Germany, ideal for homes that want to start with just a few panels

For customers who want a balance of price and quality that scales from small to large, Sungrow is a good fit

Although Sungrow is good quality, consider a few points before deciding: after-sales service may still be limited in some areas, even though there are more dealers in Thailand now, and you should choose installers experienced with Sungrow so the inverter performs at its best

Inverter: 10-year warranty

Inverter LV Batt MG5RL: 5-year warranty

HV Battery: 10-year warranty

LV Battery: 7-year warranty

Meter: 2-year warranty

Meteo Station: 1-year warranty

Gateway: 2-year warranty

Optimizer/RSD: 30-year warranty

Yes. Sungrow makes its own energy storage systems (ESS) and EV chargers, which work with Sungrow inverters

Sungrow is already installed in many projects in Thailand, including homes, factories and solar farms. Customers can ask the EV Power Energy team for reference sites or real installation reviews

Atmoce is a micro-inverter from Germany. Its strengths are European-standard safety and easy expansion, making it ideal for homes that want to adopt solar gradually without a big upfront investment

Atmoce focuses on German micro-inverters, ideal for homes that want to start with a small solar system and expand later without a large upfront investment. Huawei and Sungrow focus on central (String/Hybrid) inverters suited to larger systems such as whole homes or factories, while Sigenergy is All-in-One, combining solar, battery, EV charger and AI Energy Management — ideal for premium homes and projects that want a complete solution

Micro-inverters work independently on each panel, so if one panel is shaded or has a problem, the rest of the system isn't affected — unlike a string inverter, where the whole system's performance depends on the weakest panel. Micro-inverters are also safer, avoid excessively high voltages, are easy to expand and let you monitor each panel in the app

Small to mid-sized homes that want to start with a few panels and expand later — for example homes with limited roof space or a smaller starting budget that still want a system meeting European safety standards

Yes. Because Atmoce uses a micro-inverter on each panel, you can start with just a few panels and add new panels with their own micro-inverters later, without dismantling the existing system

Atmoce is a German micro-inverter built to European standards, with Rapid Shutdown for safety in emergencies, reduced backfeed risk and no high string voltages, so you can be confident in both safety and quality

Micro-inverter: 30-year warranty; battery: 10-year warranty

Yes. EV Power Energy is Atmoce's direct installation and after-sales partner in Thailand, with technicians and spare parts ready for immediate replacement if anything fails

Yes. Atmoce installations have started in Thailand, including well-known cases such as artist Tu Phopthorn and YouTuber Extream IT, who also chose Atmoce — so you can be confident the system is reliable and suited to real homes