If you already received a solar quotation in Malaysia, do not rush to pay deposit just because the package looks cheap or the installer says the promotion is ending soon. A proper solar decision should be based on system size, expected TNB savings, Solar ATAP assumptions, solar panel brand, inverter warranty, workmanship coverage, payment terms and long-term after-sales support.
For homeowners, solar panels for home should be matched with your monthly TNB bill, roof space, phase type and daytime electricity usage. For shop lots, offices, factories, warehouses and commercial buildings, the quotation should also consider operating hours, daytime load, roof structure and project-level ROI.
This guide explains the 7 most important things to check before paying deposit for a solar quotation in Malaysia.
Before paying deposit for a solar quotation in Malaysia, check whether the proposed system size is suitable for your monthly TNB bill, whether the estimated savings are realistic, how Solar ATAP is calculated, what solar panel and inverter brands are used, how long the inverter warranty is, what workmanship coverage is included, and whether after-sales support is clearly stated.
A good solar quotation should not only show the total price. It should explain why the system is recommended, how savings are estimated, what is included, what is excluded, and who will support you after installation.
Do not pay deposit only because a quotation looks cheaper than others. A solar package with unclear warranty, weak after-sales support or unrealistic TNB savings assumptions may cost more in the long run.
Many Malaysian homeowners and business owners compare solar quotations because the price difference between installers can look large. However, a solar quotation is not the same as buying a simple appliance. The final value depends on system design, roof condition, equipment selection, application support, warranty terms and installer reliability.
Two installers may quote different prices for the same property because they use different solar panel brands, inverter brands, mounting systems, warranty structures, monitoring tools and savings assumptions. One quotation may look cheaper at first, but it may exclude items that another quotation already includes.
That is why users should compare quotation details before paying deposit, especially if the quotation involves home solar installation, commercial solar, factory solar, Solar ATAP application or high-value rooftop solar projects.
The first thing to check is the proposed system size. In Malaysia, solar quotations are usually presented in kWp. A larger system may generate more electricity, but it may not always give the best ROI if your property cannot use enough solar energy during the day.
Before accepting the quotation, ask:
A serious installer should be able to explain the reason behind the recommended size. If the system size is chosen only because your roof has enough space, the quotation may not be properly optimized for savings and ROI.
| Monthly TNB Bill | Quotation Review Direction | What to Check |
|---|---|---|
| Below RM200 | Payback period may be longer | Check if the proposed system is too large for your usage |
| RM300 - RM500 | Worth checking for many landed homes | Compare system size, ROI, Solar ATAP assumptions and warranty |
| RM500 - RM1,000 | Stronger savings potential | Compare multiple quotations and check if savings assumptions are realistic |
| Above RM1,000 | Should evaluate solar seriously | Check system sizing, inverter warranty, monitoring and payback period carefully |
| Commercial or factory bill | May have higher project value | Check daytime load, operating hours, roof structure, safety planning and project ROI |
Many users are attracted by estimated monthly TNB savings. However, savings figures should not be accepted blindly. A proper quotation should explain the estimated monthly generation, expected self-consumption, expected exported energy and estimated monthly electricity bill reduction.
Ask the installer:
Be careful if the quotation promises that your TNB bill will become zero without explaining daytime usage, night usage, minimum charges, export treatment and actual consumption pattern.
Solar savings are estimates. Actual savings may vary based on weather, system performance, electricity usage, billing structure, roof direction, shading, system maintenance and Solar ATAP programme terms.
For new solar users in Malaysia, Solar ATAP is an important part of quotation comparison. Under the Solar ATAP framework, solar electricity generated by your rooftop system is mainly used for self-consumption first. If the solar system produces more electricity than your property uses at that time, excess energy may be exported to the grid and treated according to Solar ATAP credit rules.
This means you should not only ask, “How many panels can my roof fit?” A better question is: “How much solar energy can my property actually use, and how does Solar ATAP affect my estimated savings?”
Before paying deposit, ask:
If the quotation does not explain Solar ATAP assumptions clearly, you may not be able to judge whether the estimated ROI is realistic.
Use the Solar100 ROI Calculator and read the NEM vs ATAP guide before confirming a solar quotation. This helps you understand installation cost, estimated TNB savings, payback period and current solar policy direction.
A solar quotation should clearly state the solar panel brand, model, wattage and warranty terms. If the quotation only says “premium panel” or “Tier 1 panel” without model details, you may not be able to compare it properly with another quotation.
Check whether the quotation includes:
Do not compare only by panel quantity. A quotation with fewer higher-wattage panels may have a different design from a quotation with more lower-wattage panels. What matters is the total system size, expected generation, equipment quality, warranty clarity and installer support.
The inverter is one of the most important components in a solar PV system. It converts solar energy into usable electricity for your property. If the inverter warranty is short or unclear, future replacement cost may affect your long-term ROI.
Before paying deposit, check:
A quotation with a lower upfront price may not always be better if inverter warranty coverage, monitoring support or after-sales response is weak.
Solar installation involves mounting work, roof handling, cabling, electrical protection, inverter installation and testing. For homeowners, roof leakage concern is common. For commercial and factory owners, safety planning and installation quality are especially important.
Check whether the quotation clearly explains:
If an installer cannot explain exclusions clearly, you may face additional charges after deposit. A complete quotation should reduce uncertainty before installation begins.
Before paying deposit, check the payment schedule carefully. A professional quotation should explain deposit amount, progress payment, final payment, cancellation terms and installation timeline.
Ask these questions before signing:
Solar is a long-term system. The installer’s after-sales support matters because you may need help with monitoring, warranty claims, inverter issues, system inspection or documentation later.
Use this simple table to compare whether your solar quotation is clear enough before paying deposit.
| Quotation Item | Clear Quotation | Weak Quotation |
|---|---|---|
| System size | Shows kWp size and explains why it is recommended | Only says package size without explanation |
| TNB savings | Shows estimated monthly generation, savings and payback period | Promises high savings without calculation |
| Solar ATAP | Explains self-consumption, export credit and application support | Mentions ATAP but does not explain how it affects ROI |
| Solar panel | Lists brand, model, wattage and warranty | Only says premium panel or Tier 1 panel |
| Inverter | Lists brand, model, warranty and monitoring support | Inverter detail is missing or unclear |
| Workmanship | Explains installation warranty and roof-related coverage | Workmanship coverage is vague |
| Payment terms | Shows deposit, progress payment and final payment clearly | Pushes deposit without explaining project flow |
| After-sales support | Explains who supports monitoring, warranty and system issues | After-sales process is not stated clearly |
Be careful if you notice these warning signs in a solar quotation or installer explanation:
Before paying deposit, make sure you understand what is included, what is excluded, who handles the application, when installation will start, what warranty applies and who will support you after installation.
If you want to check whether your solar quotation is reasonable, prepare the basic information below. This will make it easier to compare the package properly.
Home solar quotation and commercial solar quotation should not be compared in the same way. Homeowners usually focus on monthly TNB savings, roof suitability, phase type, warranty and payback period. Business owners should also check operating hours, daytime load, maximum demand, roof access, safety planning and project ROI.
| User Type | Main Concern | What to Check Before Deposit |
|---|---|---|
| Homeowner | Reduce monthly TNB bill | System size, roof suitability, Solar ATAP, TNB savings, warranty and payback period |
| Semi-D or bungalow owner | Larger roof and higher usage | System right-sizing, phase type, inverter capacity, monitoring and roof design |
| Shop lot or office owner | Daytime business usage | Operating hours, monthly bill, roof access, system size and quotation scope |
| Factory or warehouse owner | High electricity cost | Load profile, roof structure, safety planning, system design and project ROI |
If you want to compare installer options before paying deposit, you can also view Solar100's solar installer directory:
Compare Solar Installers in Malaysia
Before choosing any installer, compare system size, quotation details, inverter warranty, workmanship coverage, Solar ATAP assumptions, TNB savings and ROI.
If your current quotation is unclear, too expensive, too cheap, too rushed or missing important details, it is reasonable to compare another quotation before paying deposit. A second quotation does not mean you must choose the cheaper installer. It helps you understand whether the first proposal is properly priced and properly explained.
You should consider getting another quotation if:
For many users, comparing two or three quotations gives a clearer picture of market pricing, package differences and installer professionalism.
Send Solar100 your quotation details if you want to check whether the package is reasonable. You can share your area, property type, monthly TNB bill, quotation amount, system size, panel brand and inverter brand after WhatsApp opens.
If you already received a solar quotation in Malaysia, check more than the total price. A proper solar quotation should explain system size, expected monthly generation, TNB savings, Solar ATAP assumptions, solar panel brand, inverter brand, inverter warranty, workmanship coverage, payment terms and after-sales support.
For homeowners, the quotation should be matched with your monthly TNB bill, roof suitability, phase type and usage pattern. For commercial and factory users, the quotation should also consider operating hours, daytime load, roof structure, system safety and project ROI.
Before paying deposit, calculate your ROI, understand NEM vs ATAP, compare installer options and make sure the quotation gives clear long-term value instead of only a low upfront price.
This Solar100 guide helps users who already received a solar quotation in Malaysia check 7 important items before paying deposit: system size, TNB savings, Solar ATAP assumptions, solar panel details, inverter warranty, workmanship coverage, hidden costs, payment terms and after-sales support. Users should compare solar quotations based on suitability, realistic savings, warranty clarity and installer reliability, not price alone.
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