Costs & Economics
400 real questions, answered
Every costs & economicsquestion across Sunnify's blog, grouped by article. Click one to jump straight to the answer.
Best Solar Companies in Singapore (2026): An Independently Verified Comparison
- What's the methodology behind this list?
- Why isn't there an overall score?
- How were these companies chosen and ordered?
- UTICA
- PMCE
- Solargy
- Energetix
- Eigen Energy
- aKanDo Solutions
- LHN Energy
- Union Energy
- Rezeca Renewables
- FOMO Energy
- GetSolar
- GenesisSolar
- Energio
- Sunollo
- What this list does not tell you
- How this list gets updated
- Why isn't Sunnify on this list?
- Why does an installer Sunnify partners with appear on this list without being labelled as a partner?
- Why doesn't this list rank installers by a single overall score?
- Does a longer time in business actually mean a better installer?
- Why do some companies on this list have two different founding years listed?
GST and Solar Panel Purchases in Singapore: What Homeowners Should Know
- How does GST actually apply to a solar quote?
- Why does this matter when comparing quotes?
- What does GST actually look like in dollars on a real system size?
- Does GST apply the same way to a Power Purchase Agreement as it does to an outright purchase?
- Can a homeowner claim GST back on a solar purchase?
- Does adding a battery later change how GST applies?
- Does GST affect the payback period calculation?
- Is there a GST exemption for residential solar panels in Singapore?
- Is the S$1,000 to S$1,600 per kWp price range GST-inclusive?
- Can I claim back GST on a residential solar purchase?
- Do I need to register for GST when installing solar on my home?
How to Check a Solar Installer's Safety Record in Singapore
- Why does this matter specifically for solar installation?
- What can you actually check before signing?
- Isn't checking MOM's record the same thing as checking a BCA license? Why do both?
- What does a genuinely transparent installer look like, beyond just answering safety questions?
- What if an installer is reluctant to discuss safety?
- What should you actually do if the MOM check turns up something concerning?
- What are MOM WSH demerit points and why do they matter for solar installers?
- How do I actually check an installer's safety record before signing?
- Is a contractor with a clean safety record automatically a good choice?
How to Compare Two Solar Quotes in Singapore, Line by Line
- What's the first number to normalise before comparing anything else?
- Do both quotes actually describe the same system?
- What does a real side-by-side comparison actually look like?
- Why does the generation estimate gap matter more than it looks?
- How do you turn this into one real number, a 25-year comparison?
- Does the GST question actually change the comparison?
- So which quote is actually better?
- When should you reject both quotes and start over with a third?
- Is the cheaper of two solar quotes always the worse deal?
- Should I compare two solar quotes by total price or price per kWp?
- What if my two quotes are for slightly different system sizes?
- How many solar quotes should I actually get before deciding?
- Do two solar quotes always assume the same self-consumption split when projecting savings?
How to Evaluate a Solar Installer's Savings-Guarantee Claim
- What should a real guarantee actually specify?
- What are the clearest red flags?
- What actually makes a written guarantee legally enforceable in Singapore?
- How does a savings guarantee relate to the P50/P90 estimate an installer should already be giving you?
- What does a shortfall remedy actually look like worked through with numbers?
- Does a missing guarantee mean an installer is untrustworthy?
- What should you actually ask before signing?
- What should a real savings guarantee actually specify?
- What is a red flag in a savings guarantee claim?
- Is a savings guarantee even necessary if I trust the installer's calculations?
Is It a Roof Leak or Condensation? Diagnosing a Stain After Solar Installation
- Why doesn't timing alone prove causation?
- How do condensation and a leak actually look different?
- Does the solar array itself affect roof ventilation?
- How does a professional actually confirm which one it is?
- What can a homeowner check before calling anyone?
- How do you tell them apart at a glance?
- What actually fixes condensation, once confirmed?
- Why does getting this right matter for liability, not just repair?
- Does installing solar panels reduce roof ventilation and cause condensation?
- Can I tell the difference myself, or do I need a professional?
- If it turns out to be condensation, is that the solar installer's responsibility?
- What actually fixes a condensation problem, if not sealing something?
Is Solar Worth It in Singapore? The Honest Verdict
- How solar actually pays for itself
- What counts as self-consumption, and why does it matter more than roof size?
- Why is the export rate lower than the retail tariff?
- How does solar actually change my SP Group bill?
- What does a system cost, and what does it return, by property type?
- What is the real 25-year return, not just the payback year?
- What actually separates a good case from a mediocre one?
- Does timing self-consumption during the day actually matter?
- How much do roof orientation and shading change the numbers?
- What can go wrong, and what does it actually cost?
- When is solar genuinely not worth it?
- Does heavy roof shading rule out solar?
- What if I am planning to sell within a few years?
- Should roof repairs happen before or after installing solar?
- Does very low daytime electricity usage rule out solar?
- Does solar increase property value in Singapore?
- How does this compare to other places to put the money?
- Is solar still worth it if electricity tariffs fall?
- Do I need a battery for solar to be worth it?
- What is the actual payback period for solar in Singapore?
- When is solar not worth it in Singapore?
- How much money does solar actually save over 25 years in Singapore?
- Is solar worth it for a smaller property like a semi-detached house?
- How long does it take to find out my actual numbers?
Making a Solar Warranty Claim That Actually Succeeds
- Which warranty actually applies to your specific problem?
- What evidence actually makes a claim succeed?
- Why does a single bad week never work as evidence on its own?
- How do you actually compare real output against the guaranteed curve?
- Who do you actually contact to start a claim?
- What if my original installer is no longer in business?
- What's a realistic timeline for a claim to actually resolve?
- What does a real underperformance claim actually look like worked through?
- Does the exact wording of a claim actually matter?
- When does a claim genuinely not qualify?
- Do I file a solar warranty claim with my installer or the manufacturer?
- What evidence actually makes an underperformance claim succeed?
- How long does a solar warranty claim actually take to resolve?
- Can I still make a claim if my original installer has closed down?
On-Site Solar Installation Safety: What to Expect in Singapore
- How does a crew actually access the roof safely?
- Does the mounting method actually change the on-site safety picture, not just the roof access method?
- What safety precautions actually apply once live electrical wiring is involved, not just the physical roof work?
- What does a properly equipped crew actually look like?
- How does this connect to what happens before signing?
- How long does the actual work take, and what should a household expect?
- What should a homeowner ask before installation day?
- What happens if bad weather hits partway through a multi-day installation?
- How long does a typical solar installation take on a Singapore landed home?
- Does the installer need scaffolding for every Singapore landed home installation?
- What should I check about an installer's safety practices before signing?
Red Flags in a Solar Quote: An Annotated Example
- What does this quote actually say?
- Why is S$10,800 for a 12kWp system worth questioning?
- Why does 'premium panels' by itself tell you nothing?
- Why is 'save up to S$3,500 a year' a red flag on its own?
- What's actually wrong with '25 year warranty included'?
- Why does a 50% deposit before any survey matter?
- Why does a 24-hour validity window matter?
- What does this quote leave out entirely?
- What would a genuinely good version of this quote say instead?
- How many flags together mean you should just walk away?
- Does one red flag in a solar quote mean the installer is dishonest?
- Is a suspiciously cheap solar quote always a bad sign?
- What is the single biggest red flag in a solar quote?
- Should I show a red-flag quote back to the installer, or just walk away?
S$30,000 for Your Home: Solar, Aircon Upgrade, or Insulation First?
- What does S$30,000 actually buy in each category?
- What's the actual payback on each, on its own?
- Why is insulation's payback the hardest of the three to pin down?
- Are these three actually competing for the same S$30,000, or do they compound?
- What's the realistic order if the full S$30,000 is not available all at once?
- When does an aircon upgrade genuinely jump the queue ahead of solar?
- Should I do insulation or an aircon upgrade before installing solar?
- Which of the three has the fastest payback on its own?
- Does an old aircon unit ever need to jump the queue ahead of solar?
- Can the Climate Voucher be used alongside a solar installation?
Selling a Home With Solar Panels in Singapore
- Does solar actually help or hurt when selling a landed home?
- What documentation should be handed over to a buyer?
- Are owned solar panels legally guaranteed to be included in the sale?
- Does the SP Group account and export credit registration carry over to the new owner automatically?
- Do the panel and inverter warranties actually transfer to a new owner?
- What if the system was financed through a solar operator instead of owned outright?
- What does the actual paperwork sequence look like when listing a home with solar?
- Does solar add measurable value, or just lower running costs?
- Does having solar panels make a Singapore landed home harder to sell?
- Do solar panel warranties transfer to a new homeowner when a property is sold?
- What happens to a solar operator contract if I sell my house?
Should You Time Your Solar Installation Around Chinese New Year?
- Does Chinese New Year actually affect solar installation timing?
- What actually happens to contractor capacity before CNY?
- Does the installation work actually stop during the CNY holiday itself?
- Does the government approval side slow down too, not just the contractor side?
- Does this affect a strata property's MCST timeline too?
- So when should I actually start if I want it done before CNY?
- Should I rush a quote decision just to beat the CNY deadline?
- Is there a genuinely better time of year to install, if my timing is flexible?
- Does Chinese New Year actually affect solar installation timing?
- Does installation work actually stop during the CNY holiday itself?
- When should I start the process if I want solar done before CNY?
- Is there a genuinely better time of year to install, if my timing is flexible?
- Does this mean I should avoid installing near CNY entirely?
Singapore Electricity Tariff Tracker: Current Rate and 5-Year Trend
- What makes up the current tariff?
- How has the tariff changed over the past 5 years?
- Why does the tariff keep rising over the long run?
- How does this affect solar payback?
- Does a rising tariff also mean a rising SCT export credit rate?
- Is there any way for a residential customer to lock in a rate instead of riding the quarterly reset?
- When is the next tariff revision?
- What is the current electricity tariff in Singapore?
- Why did the Singapore electricity tariff rise so much in Q3 2026?
- How often does the electricity tariff change in Singapore?
- How does the rising tariff affect solar payback in Singapore?
Solar Contracts and the Defects Liability Period (DLP) in Singapore
- What does DLP actually cover?
- How is this different from your equipment warranties?
- What does a real DLP claim actually look like in practice?
- What should you confirm about DLP before signing?
- What actual recourse exists if an installer refuses a valid DLP claim?
- Does the DLP length itself vary between installers, or is 12 months essentially universal?
- Does DLP protect you if the installer closes down?
- What does DLP mean in a solar contract?
- How is DLP different from a panel or inverter warranty?
- What should I check about the DLP before signing?
Solar Financing in Singapore: Cash, Loan, or Lease
- How does paying cash actually compare to financing?
- What loan options actually exist for Singapore homeowners?
- What should actually be compared between loan offers?
- Does the loan tenor need to match the payback period?
- Does financing interact with government grants or incentives?
- Does a solar loan count toward my total debt servicing ratio?
- Does paying off a solar loan early carry a penalty?
- How does an operator model actually differ from owning the system?
- What does a solar operator actually charge, and how is that rate set?
- Does financing method affect what equipment actually gets installed?
- Does financing method change how GST applies?
- Which financing method actually fits which homeowner?
- How does the right choice differ by homeowner situation?
- What does this look like as an actual 25-year comparison?
- When does a specific financing method not make sense?
- When does paying cash not make sense?
- When does a loan not make sense?
- When does an operator model not make sense?
- What happens if something goes wrong partway through?
- What if my solar operator goes out of business?
- What if I cannot keep up loan repayments?
- Do Singapore banks offer specific loans for solar panels?
- Is it better to pay cash or take a loan for solar in Singapore?
- What is the difference between financing solar with a loan versus using a solar operator?
- Can I switch from a solar operator arrangement to owning the system later?
- Does how I financed solar affect selling my home later?
Solar Installer vs. Solar Operator: What's the Actual Difference
- What does a direct-purchase installer relationship actually look like?
- What does an operator or subscription relationship look like instead?
- Who actually receives the export credit under each model?
- What does a typical subscription model actually cost?
- Does having an operator's equipment on my roof complicate selling the property?
- Does the provider's own financial stability matter more under one model than the other?
- Can I buy out a subscription contract partway through and take ownership?
- Why do these different models exist in the same market?
- What should a homeowner actually check before signing with either?
- What is the difference between a solar installer and a solar operator?
- Who is responsible for maintenance under each model?
- Which model is cheaper over the long run?
Solar Panel Cost in Singapore (2026): Prices by System Size, Panel Count and Bill
- Cost by system size
- Cost by panel count
- What size do you actually need for your bill?
- Why matching your bill does not zero it
- Cost by property type
- Why the middle of this table compresses
- What about very small systems?
- The practical floor
- What is actually in the price?
- Real installed systems, and what they actually cost
- What the real spread tells you
- What you get back: savings and payback by size
- Why payback barely moves with size
- The figures this table deliberately simplifies
- What pushes a quote to the top or bottom of the range?
- Equipment tier
- Mounting complexity
- Access and roof condition
- What the per-kWp figure usually excludes
- What does adding a battery do to the price?
- The decision that actually matters
- How to read the quote line by line
- Why does cost per kWp fall as systems get bigger?
- A worked comparison: two quotes, same system size
- What the gap looks like over 25 years
- What it costs to run, not just to install
- Will prices fall if you wait?
- The honest exception
- Does a bigger system always make sense?
- The default worth starting from
- How much does a 9 panel solar system cost in Singapore?
- How much does an 18kW solar system cost in Singapore?
- What size solar system do I need for an 800 kWh per month electricity bill?
- Why do two quotes for the same system size differ by thousands of dollars?
- Can I install a 30kWp solar system on a Singapore landed home?
Solar Panel Cost Per Square Metre in Singapore
- How is this figure actually calculated?
- Why isn't cost per square metre the standard way installers quote?
- Does panel efficiency change this figure?
- How can you use this figure practically?
- Does this figure actually hold up against a real, documented installation?
- Does roof type or mounting method change the actual cost per square metre?
- Is this figure useful for comparing across different property types?
- How much does solar cost per square metre in Singapore?
- Why is cost usually quoted per kWp instead of per square metre in Singapore?
- Does a higher-efficiency panel change the cost per square metre?
Solar Panel Warranty Types in Singapore, Explained
- What does a product warranty actually cover?
- What does a performance warranty actually guarantee?
- What actually happens if a panel underperforms its guaranteed curve?
- Does warranty length actually differ by panel brand?
- How is a workmanship warranty different from the Defects Liability Period?
- Does the workmanship warranty still apply if the installer subcontracts the physical work?
- Why does the inverter get a different warranty term than the panels?
- What actually voids a solar warranty?
- Does a warranty transfer if I sell my home?
- How common are warranty claims in practice?
- Does Singapore's climate affect how these warranties actually hold up?
- What documentation should I actually keep for a future warranty claim?
- Does adding a battery or expanding the system affect existing panel warranties?
- What should a homeowner actually check before signing?
- Does a longer warranty always mean a better panel or installer?
- Can I buy extended warranty coverage separately?
- What is the difference between a product warranty and a performance warranty on solar panels?
- Who is responsible for the workmanship warranty, the installer or the panel manufacturer?
- Why is the inverter warranty typically shorter than the panel warranty?
- What actually voids a solar warranty in Singapore?
- Does a solar warranty transfer to a new owner if I sell my home?
Solar Panels and Home Insurance in Singapore: What to Declare
- Why does an insurer actually need to know about a solar installation?
- Does declaring solar panels actually change the premium?
- Is this the same thing as the installer's own warranty coverage?
- Does it matter whether it's a mandatory fire policy or a separate comprehensive home policy?
- What actually happens if a claim comes up and the panels were never declared?
- When should this actually happen in the installation timeline?
- Is there an industry-standard way insurers actually treat solar declarations across Singapore?
- Do I have to tell my insurer if I install solar panels in Singapore?
- Does declaring solar panels increase my home insurance premium?
- What documentation does an insurer typically want for a solar declaration?
Solar Roof Leak Liability in Singapore: Waterproofing vs Workmanship vs DLP
- Who can actually be liable for a solar roof leak?
- How can you tell where the leak is actually coming from?
- When is it the solar installer's responsibility?
- Does it matter if the solar installer subcontracted the roofing work?
- When is it the original roofer's responsibility?
- Does adding solar void your existing roof warranty?
- What does a real dispute like this actually look like?
- Who's liable, by cause?
- What if both contractors deny responsibility?
- What should you document before contacting either contractor?
- Which roof types make this dispute almost moot?
- Does my solar installer's DLP cover a leak from my original roof, not the mounting points?
- Can the solar installer and the original roofer blame each other?
- Which roof types make a DLP leak dispute essentially impossible?
- Who do I contact first if I cannot tell which party is responsible?
Sunnify's Solar Estimate Methodology, in Full
- What's the actual generation formula, worked through?
- What does the 30% system loss factor actually cover?
- Why 25% self-consumption specifically, not a higher or lower figure?
- What tariff and export-credit figures does the methodology use?
- How quickly does the methodology actually update after a tariff change?
- What cost assumption does the methodology use for the upfront price?
- How is a 25-year savings projection actually built from these inputs?
- Why apply a discount rate at all, rather than simply adding up 25 years of savings?
- What does this methodology deliberately not account for?
- What generation figure does Sunnify's solar estimate actually use?
- Why does Sunnify assume 25% self-consumption instead of a higher or lower figure?
- How often are the tariff and export-credit figures in the methodology updated?
- Does this methodology apply to every property type the same way?
The Real Cost of Waiting a Year to Install Solar in Singapore
- What does a year of delay actually cost, in real numbers?
- Does this number hold up even on a conservative estimate?
- Does waiting actually push back when a panel's degradation clock starts?
- Does a rising tariff make waiting more or less costly?
- Is there ever a genuine upside to waiting?
- When does it genuinely make sense to wait?
- Does the calculation change if I am financing rather than paying cash?
- Does waiting a year to install solar actually cost money?
- Does delaying installation push back when my panels start degrading?
- Is it ever actually fine to wait before deciding on solar?
- Do rising electricity tariffs make waiting more or less costly?
The Solar Buyer's Checklist for Singapore: 25 Things to Confirm Before You Sign
- Why does the order matter?
- Installer credentials, 5 checks
- Why does checking the LEW by name actually matter?
- The quote itself, 7 checks
- Equipment quality, 3 checks
- Warranty and contract terms, 5 checks
- What if the installer can't answer check 20 clearly?
- Process and paperwork, 5 checks
- Why does check 25 matter if it's the installer's insurance, not mine?
- Does this checklist change if I'm financing instead of paying cash?
- Does this checklist change for an operator or PPA arrangement instead of buying outright?
- What if a quote fails one of these checks?
- What is the single most important thing to check before signing a solar contract in Singapore?
- Is it normal for a solar installer to ask for a deposit before the site survey?
- How long should I take to decide after receiving a solar quote?
- Do I need to personally understand every technical item on this checklist?
- Should I use the same checklist if I'm financing rather than paying cash?
- Two installers pass every check but quote very different prices. What now?
Total Cost of Ownership (TCO) for Solar: The Framework Explained
- What are the actual components of solar TCO?
- Why does TCO change how quotes should be compared?
- What actually varies most between installer quotes at the same system size?
- How should a homeowner actually apply this framework?
- What does a full 25-year TCO calculation actually look like?
- Should TCO be discounted to present value, or just added up?
- Does the TCO picture change much across common system sizes?
- How is TCO different from payback period?
- Does a higher-TCO system ever make sense?
- What is Total Cost of Ownership for a solar system?
- Why does TCO matter more than comparing upfront quote prices?
- What are the actual components of a solar TCO calculation?
What Happens If My Solar Installation Gets Delayed?
- What actually causes installation delays in Singapore?
- What does a genuinely fast, undelayed installation actually look like?
- How is this different from an installer going out of business?
- What should a homeowner reasonably expect for timeline?
- Does Singapore's monsoon season actually make delays more likely at certain times of year?
- How much delay is actually reasonable before it becomes a real concern?
- What should be confirmed in the contract before signing?
- What typically causes a solar installation to be delayed in Singapore?
- Is a delayed installation the same issue as an installer going out of business?
- What should my contract say about installation timelines?
What Happens If My Solar Installer Goes Out of Business in Singapore?
- What actually depends on the installer continuing to exist?
- What survives an installer closing down?
- What if the installer closes down mid-installation, before the system is even commissioned?
- How can I check an installer's financial standing before signing anything?
- What recourse do I actually have if I've already lost money to a closed installer?
- How can you reduce this risk before signing?
- What are the practical first steps if my installer has already closed down?
- Do my solar panels stop working if my installer goes out of business?
- What warranty coverage actually survives if my installer closes down?
- How do I protect myself against this risk before signing a contract?
