How to choose the best solar installer in Phuket
Phuket has plenty of solar companies and no shortage of confident sales pitches. This is the checklist we would use ourselves — eight things a good installer can prove on paper, the red flags that should end a conversation, and the questions worth asking before you sign anything.
The best solar installer in Phuket is a licensed Thai company that is VAT-registered, does a real on-site survey (not a phone quote), gives you an itemised written quote in THB, uses coastal-rated mounting and brand-name equipment with 25–30 year panel warranties, and handles all PEA paperwork. VAT registration now matters twice: only a VAT-registered installer issuing an e-tax invoice qualifies you for Thailand's 200,000 THB personal tax deduction (Royal Decree 805, systems up to 10 kWp, installed 3 March 2026 – 31 December 2028). As a price sanity check, a 5 kW on-grid system typically runs 220,000–320,000 THB and a 10 kW system 350,000–500,000 THB before VAT.
8 things a good Phuket solar installer can prove
None of these are exotic. A serious company can show you all eight without hesitation — and a weak one will get vague on at least three.
- 1 · A licensed, registered Thai company
Ask for the company registration (a Co., Ltd. with a registration number you can verify). Solar is a 25-year relationship — you want a legal entity that will still exist when you need warranty service, not a crew working under a personal name. - 2 · VAT-registered, issuing an official e-tax invoice
Since March 2026 this is worth real money. The 200,000 THB personal income tax deduction under Royal Decree 805 only applies when the system is installed by a VAT-registered provider issuing an official e-tax invoice. A cash deal with no invoice quietly costs you the entire deduction. - 3 · A real site survey — not a quote over the phone
Roof orientation, shading, structure and the state of your distribution board all change the design. Anyone who prices your system from a LINE message is guessing, and the guess becomes your problem after installation. Expect the installer to visit, measure and look at your actual bills. - 4 · An itemised written quote in THB
Panel model and count, inverter model, mounting system, cabling and protection, labour, PEA paperwork — each as a line item. An itemised quote lets you compare offers honestly; a single lump sum hides what was left out. - 5 · Coastal-rated mounting and hardware
Phuket roofs live in salt air. Anodised-aluminium rails, stainless fasteners and corrosion-resistant components are the difference between a system that lasts 25 years and one that rusts in five. Ask specifically what the mounting is rated for. - 6 · Brand-name equipment with real warranties
Panels from major manufacturers carry 25–30 year performance warranties with degradation below 1% per year; inverters realistically last 10–15 years and carry their own manufacturer warranty. Named brands (we install LONGi panels with Deye and Huawei inverters) mean the warranty survives even if an installer doesn't. - 7 · PEA paperwork included in the price
Phuket is served by PEA (Provincial Electricity Authority), and a grid-connected system needs to be registered properly. A good installer prepares and submits everything — engineer-certified drawings included — and says so in the quote. "You can register it yourself later" is not an answer. - 8 · Aftercare that actually exists
Monitoring set up on your phone, a workmanship warranty on roof penetrations and wiring, and a maintenance/panel-cleaning option you can book. Ask what happens in year three when an inverter throws an error — the answer tells you a lot.
When to walk away
Most bad solar outcomes in Phuket trace back to one of these. None of them is rude to check.
Six questions that separate good installers from good salesmen
- "Can I see your company registration and VAT registration?" — Thirty seconds for a real company; a long story for anyone else.
- "Will you issue an official e-tax invoice in my name?" — Required for the tax deduction, and the name must match the person on the electricity meter.
- "Which exact panel and inverter models, and who backs each warranty?" — Model numbers, not brand names alone. Then check the manufacturer's warranty terms yourself.
- "Is PEA registration included in this price, and who prepares the drawings?" — The answer should be "yes, us, included" with no hedging.
- "What is your workmanship warranty on roof penetrations?" — Roof leaks are the most common installation defect. Get the coverage and duration in writing.
- "What does aftercare cost, and what does it include?" — Monitoring, cleaning, inspection schedule. If aftercare has never been priced, it has never been done.
Once the quotes are in, put them side by side against real market prices — our Phuket solar cost guide lists typical 2026 prices in THB for 3–20 kW systems, and the savings calculator gives you a payback estimate to compare against each installer's claims. If your starting point is a painful power bill, our guide to why Phuket electricity bills run so high explains what solar can and cannot fix.
Where Pearl Solar fits — judged by the same list
We won't tell you we're the best installer in Phuket — that's your call, and the checklist above is how to make it. Here is what we can put on the table: Pearl Solar Energy Co., Ltd. is a Thai-licensed, VAT-registered company based in Phuket. Our crew comes out of the generator and standby-power trade serving Phuket hotels — electrical work where a mistake means a resort goes dark, which shaped how we wire, label and test everything. We install LONGi panels with Deye and Huawei inverters and LVTOPSUN batteries, on corrosion-resistant coastal mounting, and we handle PEA paperwork for every install — it's in the quote, not an extra.
Every job starts with a free site survey and ends with a written, itemised quote in THB and an official e-tax invoice, so the 200,000 THB deduction stays available to you. We work across Phuket, Phang Nga (Khao Lak, Natai, Takua Pa) and Krabi, Mon–Sat 08:00–17:00, and we reply in English. You can see our workmanship on the projects page, or how we approach villa systems in our pool villa solar guide.
Questions people ask before choosing an installer
How many solar quotes should I get in Phuket?
Two or three written quotes is usually enough — as long as each one follows a real site survey and itemises the equipment. Comparing three phone estimates tells you nothing, because none of them has seen your roof, your shading or your main distribution board. Compare like for like: same system size, named panel and inverter models, mounting type, PEA paperwork included, and warranty terms in writing.
Do I need a VAT-registered installer to claim the 200,000 THB tax deduction?
Yes. Under Royal Decree No. 805 (2026), the personal income tax deduction of up to 200,000 THB for rooftop solar only applies if the system is installed by a VAT-registered provider that issues an official e-tax invoice, for grid-connected systems up to 10 kWp installed between 3 March 2026 and 31 December 2028. A cash-only installer with no VAT registration disqualifies the claim entirely — no invoice, no deduction.
What warranties should a solar quote in Phuket include?
Look for three separate warranties: a panel performance warranty of around 25 years with degradation below 1% per year (major brands warrant 25–30 years), a manufacturer warranty on the inverter (plan on a realistic 10–15 year inverter lifespan), and the installer's own workmanship warranty covering roof penetrations and wiring. Insist that each is named in the written quote — a verbal "everything is guaranteed" is worth nothing.
Can a foreigner sign a solar installation contract in Thailand?
Yes — there is no restriction on a foreigner contracting a solar installation for a property they own or lease. Two names matter, though: the PEA application follows the electricity meter registration, and the 200,000 THB tax deduction can only be claimed by the person named on the meter, who must also be a Thai tax resident (180+ days per year — many expats qualify). If the meter is in a company or landlord name, sort that out before you sign.
Is the cheapest solar quote always a bad choice?
Not automatically — but a price far below the local market usually means something was removed: no-name panels, mounting that is not rated for salt air, no PEA paperwork, or no company behind the warranty in five years. As a sanity check, on-grid systems in Phuket typically run about 220,000–320,000 THB for 5 kW and 350,000–500,000 THB for 10 kW before VAT. A quote dramatically below that deserves harder questions, not a faster signature.
Put us through the checklist
Book a free site survey and get a written, itemised quote in THB — then compare it against anyone else's. Call, message us on LINE, or email; we reply in English. No obligation.
Pearl Solar Energy Co., Ltd. · 19/27 Moo 2, Wichit, Mueang Phuket, Phuket 83000 · Mon–Sat 08:00–17:00