The adoption of solar power systems is rapidly accelerating globally, driven by environmental and financial incentives. For instance, in Malaysia, solar photovoltaic (PV) installed capacity has demonstrated an impressive 48% CAGR since 2011, making solar an increasingly popular choice for both residential and commercial property owners.
What does Solar Installation Involve
Solar installation fundamentally involves establishing a system that converts sunlight into electricity suitable for home or grid use. This requires several key components, including solar panels (PV panels), an inverter, and a racking system, along with various electrical parts such as breakers, meters, connectors, and fuses. The panels absorb sunlight, generating direct current (DC) electricity, which the inverter then converts into alternating current (AC) to power household appliances and potentially feed back into the electrical grid.
There are two primary system configurations available:
- Grid-Tie Systems: These systems connect directly to the utility grid. They are often chosen for minimising the entry-level cost because they eliminate the need for expensive battery storage components. They allow the homeowner to cover 100% of their electric bill and utilise net metering agreements where excess power generated can offset future consumption.
- Hybrid Systems with Energy Storage: These systems include a solar battery pack to store excess electricity generated during the day for use during non-sunlight hours or during grid outages. While battery storage increases the overall upfront cost, it provides enhanced energy independence and ensures backup power capability.
Key Steps in the Solar Installation Process
The solar installation process is complex, moving from initial assessment and paperwork through technical execution and final commissioning.
1. System Design and Permitting
The initial phase centres on detailed planning to ensure system efficiency and regulatory compliance. Installation begins with calculating the household’s energy consumption, typically by reviewing past electricity bills, which determines the required system size needed to meet energy demands. Site suitability is rigorously assessed, considering factors such as roof orientation, angle, and shading from surrounding trees or structures.
Once the design is finalised, securing necessary permits and approvals from the government and utility bodies is crucial. This often requires obtaining stamped drawings from a professional engineer. Utilising a permit pack from the racking supplier can significantly streamline this process.
Furthermore, establishing clear communication with the local building inspector early in the project is highly recommended to understand and incorporate any specific preferences they may have, even if those slightly exceed standard code requirements. The utility company must also approve the installation, often establishing a net metering agreement that governs how excess power is credited or paid for.
2. Racking and Mounting Installation
The physical installation begins with accurately marking the roof surface using chalk or lumber crayons to define the array perimeter, rail paths, and anchor points. A primary technical requirement is ensuring that all racking elements are securely fastened into the structural rafters or trusses beneath the roof decking, rather than just the shingles or sheathing, to guarantee adequate load distribution and strength. Installers use methods like hammering or specialised tools to precisely locate these structural members.
Rooftop mounts incorporate robust waterproofing solutions, often featuring flashings with pre-installed, non-hardening, butyl-based sealants. This malleable sealant maintains effectiveness despite the thermal expansion and contraction experienced on the roof over the system’s lifespan. For optimal waterproofing, it is considered best practice to ensure the mount is installed entirely within the surface of one shingle, avoiding shingle edges.
After the mounts are secure, racking rails are attached, utilising features like dovetail T-bolts for increased strength under high winds. Innovative racking systems may include skip rail clamps, which are designed to eliminate intermediate rail rows and associated roof penetrations and clamps, thereby reducing material costs and installation time.
3. Wiring and Component Integration
After the racking framework is complete, electrical components are integrated. Microinverters or optimisers are mounted beneath the panels, connected to the robust, watertight trunk lines used for AC power distribution. Effective wire management is critical for the system’s longevity. Durable clips, sometimes made of materials similar to car bumpers, are utilised to secure the PV wires and trunk lines along the rails, preventing wire sagging, which could lead to abrasion against the hot asphalt shingles over time.
Junction boxes are installed and are often designed to automatically bond the grounding system to the attached rail. Internal wiring connections within these boxes should utilise robust, torqued lugs, such as Polaris lugs, rather than standard residential wire nuts. This ensures reliable connectivity for a system expected to operate for 25 to 30 years.
The main AC line is run through conduit to an outdoor AC disconnect box and subsequently to the home’s electrical panel. When connecting to the utility meter, specialised UL-listed line-side taps may be used to tie into the main power without interrupting the existing utility service.
4. Commissioning and Finalising
The final stage involves testing the system and adhering to safety protocols. Before closing up panels, wiring connections should be checked, and voltages measured. Once electrical safety and functionality are confirmed, safety warning labels must be strategically placed near panels, breakers, and conduits as required by code or the specific inspector’s preference.
For monitoring purposes, particularly with microinverter systems, meticulous documentation of component serial numbers and their exact location on the roof array is necessary so that tracking software can accurately match performance data to the physical configuration.
Important Considerations Before Installing a Solar System
Several key factors beyond the technical steps must be weighed before and during a solar installation project.
Safety and Professional Expertise
Safety on the roof during installation is crucial; the potential value gained from solar power is instantly negated by a serious injury. While do-it-yourself (DIY) installation can yield substantial cost savings, sometimes $7,000 to $10,000 or more compared to professional installation, it involves intensive labour and significant technical complexity.
DIY efforts also face challenges related to procuring equipment, securing necessary permits, and potential implications for home insurance, as self-installation may void certain policies without a licensed technical sign-off.
Consequently, hiring a qualified professional is widely recommended, particularly for complicated rooftop systems. Reputable installers should be listed on government accreditation directories (such as SEDA’s RPVSP in Malaysia) and employ certified wiremen and chargemen.
System Maintenance and Durability
Solar power systems are generally considered low maintenance, but routine cleaning is necessary to remove accumulated dust, debris, and bird droppings that can diminish efficiency. Periodic professional inspections also ensure longevity.
Because solar panels and most racking systems are designed to last 25 years or longer, homeowners should assess the age and condition of their existing roof before installation. Replacing an old roof simultaneously with a solar install is a practical way to avoid having to dismantle and reinstall the system later on.
Installation Costs and Financing
For typical residential properties, solar systems can require a substantial upfront investment, often ranging from approximately RM14,000 to RM46,000 in Malaysia, depending on the house size and required capacity. For example, a system sized for a standard terrace house (4-6 kWp) may cost between RM16,000 and RM24,000.
Consumers have multiple financing options. Purchasing the system outright often qualifies the owner for government tax credits and incentives. Alternatively, solar loans function similarly to home improvement loans, potentially making monthly loan payments smaller than the previous electricity bill. Solar leases and Power Purchase Agreements (PPAs) eliminate most, if not all, upfront costs, allowing the consumer to purchase the power generated by the system at a predetermined rate. However, owners opting for leases or PPAs do not receive the ownership-based tax benefits.
Savings and Return on Investment
The primary motivation for many installations is achieving substantial long-term savings by reducing or eliminating reliance on utility power. Homeowners who install solar often report that their monthly electricity bills decrease significantly, sometimes dropping from hundreds of currency units to merely a fraction of the previous cost.
On average, most homeowners can anticipate reaching a full return on their investment (ROI) within seven to ten years. After the system is paid off, the electricity generated is essentially free, providing decades of protection against rising energy costs. Furthermore, owning a solar energy system generally increases the home’s resale value, with studies indicating buyers are willing to pay a premium for solar-equipped homes, which may also sell faster than properties without them.
Estimate your potential savings instantly using Unitrade’s free NEM Calculator.
Make the Switch to Solar with Confidence
Solar installation is a smart investment—but success depends on having the right components and technical support from day one.
As your one-stop solar supplier with over 40 years of experience, Unitrade offers everything you need for a complete installation, including high-efficiency solar panels (residential & commercial), smart inverters, battery storage systems, and BIPV roof mounting structures. Whether you’re planning a grid-tie or hybrid system, our solutions are designed for durability, compliance, and peace of mind.
Contact Unitrade today to get a free consultation and personalised quotation for your solar installation project.