If you have ever wondered how a solar panel on a rooftop actually turns sunlight into electricity that powers your air conditioning, refrigerator, and lights — you are about to find out. Solar photovoltaics is a technology that, on the surface, seems almost magical. In practice, it is elegant physics that has been refined over decades into one of the most reliable, cost-effective, and accessible forms of electricity generation available today.
For Malaysian homeowners and businesses exploring their options in solar renewable energy, understanding the fundamentals of how a solar PV system works is the first step to making a confident, well-informed investment.
Key Takeaways
The term photovoltaic comes from two roots: photo, meaning light, and voltaic, referring to the production of electricity. Put together, photovoltaics literally means “producing electricity directly from light.”
A solar PV panel captures photons — the fundamental particles of light — from sunlight and converts them into an electrical current through a process called the photovoltaic effect. This process produces no noise, no emissions, no combustion, and no moving parts. It is one of the cleanest forms of electricity generation known.
It is important to note the distinction between solar photovoltaics and solar thermal technology. Solar thermal systems use sunlight to heat water — commonly seen in rooftop water heaters. Solar PV systems, by contrast, generate electrical current that can power your appliances, feed into the grid, or charge a battery storage system. The two technologies are complementary but fundamentally different in their function.
At the heart of every solar PV panel is a collection of photovoltaic cells — typically made from silicon, one of the most abundant semiconductor materials on Earth. Understanding what happens inside these cells explains the entire system.
Each PV cell consists of two layers of silicon treated with different chemical impurities: one layer carries a positive charge (P-type), and the other carries a negative charge (N-type). This creates what is known as a P-N junction.
When photons from sunlight strike the cell’s surface, they transfer their energy to the atoms within the silicon material. This energy is sufficient to knock electrons loose from their parent atoms.
The free electrons, now energised, are attracted toward the N-type layer and repelled from the P-type layer. This directional movement of electrons creates a flow of electrical charge — which is, by definition, an electric current.
This current is direct current (DC) — electricity that flows in one continuous direction. DC is the native output of every solar cell.
A single photovoltaic cell produces only a small amount of electricity — typically around 0.5 volts. To generate useful power, dozens of cells are connected together and sealed within a weatherproof frame to form a solar PV panel (also called a module).
Multiple panels are then wired together to form an array. Panels wired in series increase voltage; panels wired in parallel increase current. By combining series and parallel connections, system designers can achieve the exact voltage and current specifications required for a given installation — whether a 5 kWp residential system or a 1,000 kWp commercial array.
A complete solar photovoltaic system is more than just panels on a roof. Each component plays a specific and essential role.
The panels are the primary energy-harvesting component. Modern solar PV panels for residential and commercial applications in Malaysia are predominantly monocrystalline silicon, offering efficiency ratings of 19% to 23% — meaning they convert that proportion of the sunlight that strikes them into usable electricity.
Monocrystalline panels are recognised by their uniform dark colour and rounded cell edges. Their higher efficiency makes them particularly well-suited to Malaysian rooftops where space is limited and maximum energy yield per square metre is important.
Because solar panels produce DC electricity, and Malaysian homes and businesses run on AC (alternating current) electricity at 240V / 50Hz, a solar inverter is required to convert the panel output into a usable form.
There are three main inverter configurations used in Malaysian solar installations:
String inverters — connect multiple panels in a series string and convert their combined DC output to AC. Cost-effective and well-proven for straightforward roof installations.
Microinverters — mounted directly behind each individual panel, converting DC to AC at the panel level. Ideal for roofs with shading or complex orientations, as each panel operates independently.
Hybrid inverters — combine solar inverter and battery charge controller functions in a single unit. Used in systems that incorporate a Battery Energy Storage System (BESS) for energy storage and night-time use.
Ray Go Solar deploys SolarEdge inverter technology with individual power optimisers for enhanced performance and DC-level safety — a particularly important consideration for commercial and industrial rooftops.
The racking and mounting hardware secures the panels to the roof at the correct angle and orientation. In Malaysia, south-facing or west-facing orientations at a tilt of 10 to 20 degrees from horizontal optimise energy capture throughout the year.
Mounting systems must be engineered to withstand Malaysia’s wind loads and tropical rainfall, with all penetrations properly waterproofed to prevent roof leaks.
A generation meter records how much electricity your solar PV system produces. For grid-connected systems under Solar ATAP or SELCO, a bi-directional (import/export) meter is installed by TNB to measure both the electricity you draw from the grid and the excess solar energy you export back to it.
DC and AC cabling, surge protection devices, circuit breakers, and earthing systems form the electrical backbone of the installation. These must be correctly specified, installed, and tested by a qualified electrical engineer to ensure safety and compliance with Malaysian electrical standards.
A BESS stores excess solar energy generated during peak sun hours for use at night or during grid outages. Pairing a solar PV system with battery storage increases self-consumption, reduces grid dependence, and provides energy resilience. Ray Go Solar offers integrated BESS solutions as part of our solar energy packages.
Bringing all the components together, here is how a typical grid-connected solar PV system operates throughout the day:
During daylight hours, solar panels generate DC electricity from sunlight. The inverter converts this to AC electricity, which first powers the property’s own appliances and equipment — lights, air conditioning, machinery, and so on.
If generation exceeds demand, the surplus electricity is exported to the TNB grid. Under the Solar ATAP programme, this exported energy is credited against your electricity bill at a set rate, reducing your monthly TNB charges.
If demand exceeds generation (for example, on cloudy days or in the evenings), the shortfall is automatically drawn from the TNB grid as normal, ensuring uninterrupted power supply.
With a BESS installed, surplus daytime generation is stored in the battery rather than exported to the grid. This stored energy is then used at night or during peak tariff periods, maximising self-consumption and reducing import costs further.
Malaysia sits close to the equator, giving the country consistently high solar irradiance throughout the year. Unlike countries in temperate climates, Malaysia does not experience the dramatic seasonal variation in sun hours that reduces solar output in winter months.
Malaysia receives an average of 4.5 to 5.5 peak sun hours per day, making it one of the most productive solar markets in Southeast Asia. Combined with competitive system costs and supportive government programmes administered by SEDA Malaysia, the financial case for solar renewable energy in Malaysia is exceptionally strong.
Malaysia’s national renewable energy policy targets 70% renewable energy in the national energy mix by 2050, with solar PV representing a central pillar of that transition. The Solar ATAP programme for residential consumers and the SELCO programme for commercial and industrial users provide the regulatory and incentive framework that enables grid-connected solar installations to thrive.
For a detailed comparison of how Solar ATAP and SELCO differ in terms of system size, export rules, and eligibility, read our article on Solar ATAP vs SELCO Malaysia.
|
Term |
What It Means |
|
kWp (kilowatt-peak) |
The rated power output of a solar system under standard test conditions |
|
kWh (kilowatt-hour) |
The unit of energy used to measure electricity generated or consumed |
|
DC (Direct Current) |
The type of electricity produced by solar PV panels |
|
AC (Alternating Current) |
The type of electricity used in homes and buildings |
|
Inverter |
Device that converts DC from solar panels to usable AC electricity |
|
Net Energy Metering |
A billing mechanism crediting exported solar energy against grid imports |
|
Solar ATAP |
SEDA Malaysia’s residential rooftop solar programme (effective January 2026) |
|
BESS |
Battery Energy Storage System — stores solar energy for later use |
|
EPCC |
Engineering, Procurement, Construction and Commissioning — the full-service model used by Ray Go Solar |
A solar PV system is a long-term asset with a typical operational lifespan of 25 years or more. For most Malaysian homeowners and businesses, the combination of reduced electricity bills, passive income from exported energy, and rising grid tariffs makes solar PV one of the strongest financial investments available today.
The right system size, panel type, inverter configuration, and programme eligibility all depend on your property’s specific characteristics — your roof orientation, available area, electricity consumption, and grid connection type.
Ray Go Solar offers a no-obligation site assessment that covers all of these factors and produces a detailed system proposal with projected savings and ROI calculations. Explore our residential solar solutions for homeowners, or our commercial and industrial solar services for businesses and factories.
With over 13 years of experience, SEDA recognition, ISPQ-certified engineers, and a portfolio spanning hundreds of residential, commercial, and industrial projects across Malaysia, Ray Go Solar is your trusted partner for solar photovoltaic systems that are designed correctly, installed safely, and supported for the long term.
Get a free solar assessment today and find out exactly how much your property could generate — and save.
