Everything else you'll want to know

Most landed homes land between 70% and 90% of the bill, using the assumptions published on the home page. The reason it runs that high in 2026 is that both halves of the equation are now worth a lot: power you use yourself avoids the $0.3478 tariff outright, and power you export still earns $0.2536 under the Simplified Credit Treatment. The gap between those two numbers is small, which is unusual and very favourable. The main variable left is how much you use during daylight hours — a household with someone home in the day does better than one that empties out at eight in the morning.

The modules degrade slowly and should be producing around 88% of their original output at year 25. The inverters are the shorter-lived component — plan for one replacement somewhere between year 12 and 15, at a cost of a few thousand dollars. With a three to four year payback that replacement falls long after the system has paid for itself, but it belongs in your maths and most quotes leave it out.

Yes. Grid-connected systems need registration with SP Group and clearance under the EMA framework, and the electrical work must be certified by a Licensed Electrical Worker. We prepare and submit all of it. On conservation properties or houses in gazetted areas there are additional constraints on visibility from the street, which we'll flag at survey.

It flows back into the grid and SP credits your account under the Simplified Credit Treatment, currently about $0.2536 per kWh. That rate is the regulated tariff less the grid charge, so it's stable and it climbs whenever the tariff climbs — it went up with the 17% tariff rise in July 2026. It's worth knowing that a different scheme exists: if you buy electricity from an Open Electricity Market retailer rather than SP, you fall under the Enhanced Central Intermediary Scheme instead, where the export rate tracks the volatile wholesale price. For most landed homeowners on the regulated tariff, the Simplified Credit Treatment is the better and steadier deal.

Two questions sit inside that one. What your roof and your supply can carry is broadly 8–25 kWp on an inter-terrace, 12–30 kWp or more on a semi-detached, 12–60 kWp or more on a detached home or bungalow, and 60 kWp upward on a GCB. What your bill justifies is separate — roughly 3 kWp for every $100 of monthly bill at current rates, which is what the calculator on the home page works out.

The right system usually sits between the two. Because the export credit is high relative to the tariff, building above what your bill needs still pays back inside four years, so a roof left half empty is money left on it. We show you both figures at survey rather than picking whichever sells more panels.

Often yes, and that's unusual — in most countries surplus generation is close to wasted because export rates are a fraction of retail. Here the two are close together: you avoid $0.3478 per unit you use yourself, and earn $0.2536 per unit you export, so exported power is worth about 73% of full value.

What that means in practice, at the systems we install: a panel whose output you consume yourself pays for itself in roughly two and a half years. A panel whose output goes entirely to the grid takes about three and a half. Slower, but still inside four years, which is why oversizing relative to your bill is a defensible decision rather than an expensive one.

Two caveats. This depends on the gap between the tariff and the export credit staying narrow, and both are reviewed quarterly. And it assumes you have the roof for it — beyond a point you're paying for scaffolding and cable runs rather than generation.

They are rarely the same number, and the gap between them is the main thing we settle at survey. A bungalow with 400 m² of clear roof and a $600 monthly bill could physically take 60 kWp, but matching the bill needs about 19. A three-storey terrace with heavy aircon often has the opposite problem — the bill justifies more than the roof or the supply will hold.

We show you both figures and let you choose, rather than sizing to whichever sells the bigger system.

Panel output: manufacturer's warranty. Panel product: manufacturer's warranty. Inverter: manufacturer's warranty. Workmanship: full coverage by Easy Solar. Roof penetrations we make: guaranteed watertight for the duration of the system.

All of it is in the written quote before you commit, not afterwards.

It depends on your roof, not your budget. If roof area is tight or part of the array sits in shade for a few hours a day, Aiko panels earn their premium by producing more from the same space. If you have room to spare, LONGi usually gives more total output per dollar — more panels beats better panels when there's space for them. On inverters, an unshaded roof on one or two planes runs happily on Sungrow; a complicated or partly shaded roof is where Huawei's per-panel optimisers pay for themselves; and Deye makes sense if you want to keep the door open to a battery without rewiring later. We'll recommend a specific combination after the survey and explain why, and you're free to overrule us.

They start at 8 kWp — below that the fixed costs of a job, the survey, scaffolding, submissions and commissioning, stop making sense against the generation you get back.

What you may be thinking of is the ceiling rather than the floor. Most older Singapore landed homes are wired single-phase, and around 12 kWp is the practical limit of what a single-phase supply will carry, whatever the size of the roof above it. Builds and major rebuilds from the 2010s onward are generally three-phase as standard, which carries far more — that is why a detached home or GCB can run 30, 60 kWp or beyond.

If you are single-phase with a large roof, upgrading to three-phase opens the rest of it up. That is a separate job with its own cost and lead time, and we will tell you whether it is worth doing. We confirm your supply at the survey and quote on what you actually have.

It's what we design around. If you buy electricity from SP at the regulated tariff — which most landed households do, since it's the default and you stay on it unless you actively switch — your exports fall under the Simplified Credit Treatment, currently about $0.2536 per kWh. That rate is set as the tariff less grid charges, so it's stable and it climbs whenever the tariff climbs. If you've switched to an Open Electricity Market retailer, your exports go through the Enhanced Central Intermediary Scheme instead, where the credit tracks the wholesale price and moves around a great deal. Solar still works on a retailer plan, but the export half of your return becomes unpredictable and every figure we quote would need redoing. Tell us which you're on and we'll model it properly.

Yes, and it's worth designing for it now even if you don't buy one. For most Singapore landed homes a battery doesn't currently pay for itself, precisely because the export rate is so good — at $0.2536 per kWh against a $0.3478 tariff, sending surplus to the grid earns nearly as much as storing it to use later, and a battery adds $10,000 or more. That maths would change if the gap between tariff and export credit widened. We specify the inverter and leave switchboard space so adding storage later doesn't mean replacing what you've already bought.

The system stays with the property and transfers to the buyer. We'll provide a handover pack — as-built drawings, equipment schedule, warranty documents and the generation history — which valuers and buyers' solicitors tend to ask for. Remaining manufacturer warranties transfer with the equipment; tell us and we'll reassign our workmanship warranty to the new owner.

No. Both are legitimate structures and several Singapore installers offer them well. They remove the upfront cost, which genuinely helps some households, but over the full term you pay more than buying outright. We've chosen to do one thing, so if zero-upfront is what you need, we'd point you elsewhere rather than improvise it.

Not currently. We work on landed residential property only. It's a different discipline — different roof structures, different approval routes, different scale — and we'd rather be good at one than adequate at both.

We do. The sizing table on the home page gives an all-in range for each property type, from $13,000 for a small inter-terrace system up to $40,000 and beyond for a GCB.

What we cannot do is give one number, because the same array costs noticeably more on a three-storey tile roof needing full scaffolding than on a two-storey metal roof with easy access, and a switchboard at capacity adds work that has nothing to do with the panels. Larger systems also cost less per kilowatt, since survey, submissions and commissioning are largely fixed regardless of size. After the survey you get a fixed, itemised price with no variation orders.

We won't, but bring it to us anyway. What's usually more useful is going through it line by line: the yield figure assumed, the export rate assumed, whether the mounting suits your roof type, whether the switchboard work is included, and who is actually doing the installation. Price differences on this kind of job are nearly always explained by something in that list.