How to Read a Solar Quote in Singapore: 8 Line Items That Matter

You have received two or three solar proposals. They all look similar on the first page, a summary table with system size, estimated generation, and a total price. The differences that matter are in the line items, not the headline number. This is a line-by-line reading guide so you can evaluate any Singapore solar quote in under 10 minutes.

Why Quote Comparison Is Harder Than It Looks

Solar installers in Singapore are not quoting the same product. Two proposals both marked 10kWp system, S$13,000 can differ significantly in panel technology, inverter brand, what is included in the LEW process, and what the installer's obligation is after the system is commissioned. The cheapest quote frequently reaches the lowest number by omitting one or more of the eight line items below. Those items do not disappear, they become a separate invoice later, or a gap in your coverage when something goes wrong.

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The 8 Line Items Every Singapore Solar Quote Must Include

1. Panel brand, model, and datasheet link. This is not optional. Any installer quoting a serious proposal will name the specific panel, for example, LONGi LR5-54HIH-405M, 22 panels × 405W. With the model number, you can look up the efficiency, temperature coefficient, and degradation guarantee on the manufacturer's datasheet. You can also cross-reference against the EMA approved equipment list. If a quote says Tier-1 monocrystalline panels without naming the model, it is not a complete proposal.

2. EMA equipment approval confirmation. Both the panels and the inverter must appear on the EMA's approved list before they can be connected to the SP Group grid. Verify this yourself, the list is publicly searchable on the EMA website. An installer who responds to this question with annoyance is telling you something.

3. Inverter brand, model, capacity, and warranty years. The inverter is the most likely component to be replaced in a 25-year system life. Know what you are getting. A Fronius Symo 10.0-3-M carries a different 10-year warranty and service network than a Sungrow SG10RT. Both are legitimate choices, but they are not the same product and should not be priced identically.

4. LEW coordination, included or separately billed. Singapore law requires a Licensed Electrical Worker to certify any solar installation before it connects to the grid. This is not optional. What varies between quotes is whether the installer handles LEW coordination as part of their scope or whether you are expected to engage and pay for it separately. Ask directly. The LEW cost ranges from S$400 to S$700 for a typical residential system. A quote that does not address this is not a complete price.

5. SP Group GIRO solar application, who handles it. The export credit scheme under ECIS requires a formal application to SP Group to register your system, install a bi-directional meter, and set up the Solar Crediting Tariff payment. This process takes four to eight weeks and involves paperwork. Many installers handle this as part of their commissioning service. Some do not. Ask who handles it and confirm it is included in the price.

6. Structural load assessment, included, waived, or additional. Any system mounted on a clay tile or older concrete roof should include a structural load calculation to confirm the roof can support panel weight, wind uplift, and racking hardware. This is sometimes included, sometimes charged separately (S$500 to S$1,500), and sometimes skipped entirely without disclosure. Ask explicitly whether one will be done. If your roof is over 15 years old and on clay tile, insist on it.

7. Workmanship warranty length and what it covers. A 5-year workmanship warranty is the minimum reasonable standard for a Singapore installation. This covers the quality of the installation itself, mounting hardware, wiring, waterproofing around roof penetrations, separately from the manufacturer warranties on the panels and inverter. Ask for this in writing in the contract, not just verbally.

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8. The year-seven panel failure question. This is the question that separates professional installers from those you should avoid. Ask this verbatim: If a panel fails in year seven, who do I contact first, what happens next, and how long does resolution typically take? A credible installer answers this immediately, they have a process for warranty claims, a direct relationship with the panel manufacturer's Singapore distributor, and a standard resolution timeline. An installer who hesitates, deflects, or says you contact the manufacturer directly is telling you that their after-sales service ends at commissioning.

The cheapest quote often looks complete until you ask the year-seven panel failure question. The answer tells you everything about what you are actually buying.

After reading all three proposals against these eight criteria, one will be clearly better specified, one will have gaps, and one may fall somewhere in between. Negotiate on price if the better-specified proposal is worth it, but use the specification difference to justify your position. You now have the vocabulary to have that conversation with confidence.

Run your own estimate first so you arrive at installer conversations knowing your expected output and payback. The cost guide includes the full line-item price breakdown by component type across budget and premium systems.

Further reading: SP Group ECIS application process · BCA solar panel installation requirements.