Solar guides for Southern Thailand
Written from the jobs we do in the region. Each guide answers the question in full — and where the answer is that you shouldn't install yet, that is what it says.
Costs & savings
Thailand's 2026 Solar Tax Deduction: Up to THB 200,000 — Who Actually Qualifies
The measure runs until the end of 2028, but several conditions stop people who have already installed from using it. The most common mistakes are system size and the names on the documents.
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Is Solar Worth It in Nakhon Si Thammarat? Working It Out From Your Real Bill
Most people ask how high a bill has to be before solar pays off. Just as important is when you use electricity, because panels only generate during the day.
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Solar Payback in 2–3 Years? How to Work Out a Realistic Figure for Your Home
Payback depends less on system size than on how much of the power you use yourself during the day. Here is every step of the calculation, and how much the result moves when each input changes.
Read the guideSouthern Thailand specifics
It Rains a Lot in Southern Thailand — Does Solar Still Produce Real Power?
Solar panels run on light, not heat, so they still generate on overcast days. But how much less do they produce, and is it still worth it?
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Solar for Homes Near the Sea: What You Need to Know About Salt Air and Corrosion
You can install near the coast, with salt-resistant materials chosen at the design stage.
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Can Lightning Strike Solar Panels? The Protection You Need in Southern Thailand
Rooftop panels don't attract lightning the way many people fear, but surge damage from a nearby strike is real — and it can be prevented.
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Power Cuts on Koh Samui and Koh Pha Ngan: What Solar Can and Can't Do
Koh Samui's power comes through undersea cables from Khanom on the mainland, and Koh Pha Ngan shares the same outages. A standard solar system goes dark with the grid every time — backup has to be designed in from the start.
Read the guideSizing
Monthly Bill of THB 3,000, 5,000 or 10,000 — What Size Solar System Do You Need?
The best-value size is not the largest your roof can hold — it is the size that matches the electricity you use during the day.
Read the guideBasics
On-Grid, Off-Grid or Hybrid Solar: What's the Difference and Which Suits You?
The difference comes down to whether the system connects to the utility grid and whether it can store power — which changes both the price and the value.
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Is Solar With a Battery Worth It in Areas With Frequent Power Cuts?
A battery doesn't always save you more on electricity. What it really buys you is peace of mind during power cuts — and you have to judge whether that is worth the price.
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kW vs kWp vs kWh: The Solar Units on Your Quote, Explained
A solar quotation is full of look-alike numbers — kW, kWp, kWh. Mix them up and your price comparison is wrong from the start. Here is what each one actually measures.
Read the guideIn practice
Does Solar Still Work During a Power Cut?
Many people only find out at their first power cut that the house goes dark as usual, even with bright sun on the roof. Here's why, and what you need if you want power to keep running.
Read the guideWhy Do I Still Have an Electricity Bill After Installing Solar? 7 Causes and How to Check
A bill that keeps arriving after you install solar usually doesn't mean the system is broken — but sometimes it does. Here is how to tell what is normal, what needs checking, and what to look for in the monitoring app.
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Solar System Flooded? What to Do Before, During and After the Water
A flooded switchboard is dangerous even after the utility cuts the power, because the panels on the roof keep generating as long as there's light. What to do before the water arrives, what not to do during a flood, and what to do once it recedes.
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Solar vs a Generator: Which One Keeps the Power On?
The two do different jobs. Solar cuts your electricity bill every day but doesn't back you up on its own; a generator covers outages but needs fuel the whole time. The right answer usually depends on how often the power goes out, and for how long.
Read the guideFinance
Can You Pay for Solar in Installments? Financing Options Worth Knowing
You can pay in installments. Work out how much of your savings goes to interest, so you know the full cost in advance.
Read the guideThailand's 2026 People's Solar Program: Selling Power Back at THB 2.20 — Is It Worth It?
The program is real and so are the terms, but the THB 2.20 the state pays is almost half what you pay for power yourself. Here's how much selling back actually earns — and why it isn't the main reason to install solar.
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Thai Electricity Is THB 3.95 per Unit for Sep–Dec 2026 — How to Calculate Solar Payback Correctly
The tariff you see in the news and the rate you actually pay are not the same. Here's how to work out your own real cost per unit so your payback calculation is accurate.
Read the guideInstallation
Will Solar Panels Make My Roof Leak? Installation Methods That Protect Your Roof
It is homeowners' number-one worry, and a reasonable one: drill points that are not sealed correctly really can cause leaks.
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PEA Meter Replacement Fees Are Much Lower in 2026 — Check the Current Rate
The new 2026 PEA meter fees start at THB 3,300, well below the THB 8,500–9,000 set under the 2019 rules. Here's how to check which figure your quote uses.
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How Long Does Solar Installation Take, From Signing to Switching On?
The installation itself takes only a few days, but the paperwork with the utility takes months. Many people assume the system can be used as soon as it's installed.
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Single-Phase vs Three-Phase Power: Do You Need a New Meter for Solar?
Your home's power supply sets how big a solar system you can install — and it's worth knowing early whether you need a new meter, which is a separate cost.
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Check Your Roof Before Going Solar: Which Roofs Need Repair First
Solar panels stay on your roof for twenty-plus years. If the roof underneath has only a few years left, or already leaks, you want to know and fix it before installation — fixing it afterward means taking the panels down first.
Read the guideSolar in a Housing Estate or Condo: Do You Need the Juristic Person's Approval?
Before you choose a system size, find out who owns the roof. Detached houses, townhouses, condos and rented homes each need agreement from different people.
Read the guideChoosing an installer
7 Things to Check Before Choosing a Solar Installer in Southern Thailand
The cheapest price is not necessarily the best value, and the most expensive is not necessarily the best. Here is what to look at instead.
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JA Solar, LONGi, Trina, Jinko, Canadian: How Do Solar Panel Brands Compare?
What you can actually compare between panel brands is the price per watt and the number of years in the warranty document — this article puts both side by side for five brands.
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HUAWEI vs Solis vs Deye Inverters: How They Differ and What to Check on a Quote
The inverter is the hardest-working part of a solar system, and standard warranties differ by as much as double between brands. This article puts HUAWEI, Solis and Deye side by side so you can compare for yourself.
Read the guideHotels & businesses
How Much Can Hotels in Southern Thailand Save With Rooftop Solar?
Hotels use power at exactly the time panels produce it, but the design has to allow for low season — otherwise the power you generate flows out for next to nothing.
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Is Solar Worth It for Cold Storage and Ice Plants?
Compressors that run all the time are the load that absorbs daytime solar power best — and cold storage is a core industry in Songkhla and Nakhon Si Thammarat.
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Can You Put Solar on a Shophouse or Commercial Building?
A small roof but heavy daytime use — a completely different equation from a detached house, and one that often turns out better than people expect.
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Can Solar Really Cut Costs for a Restaurant or Café?
Fridges, ice machines and air-conditioning run nonstop while you're open — a pattern where solar pays back well. But your opening hours matter too.
Read the guideAgriculture
Solar Water Pumps for Rubber Plantations and Shrimp Ponds: How to Choose
Pumps run during the day, exactly when panels produce power, and their timing is flexible — which makes them one of the most cost-effective uses of solar.
Read the guideMaintenance
How Often Should You Clean Solar Panels, and Why Is the South Different?
Rain washes off dust, but not bird droppings or algae — and a small patch of grime cuts output more than a thin film of dust spread across the whole panel.
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Why Is My Solar Output Dropping, and Can I Check It Myself?
Solar systems rarely die completely. More often they slowly produce less with no warning — and the way to catch it is to look at your generation history.
Read the guideStill not sure whether solar pays off for your property?
Send us your electricity bill and we will work it out from your real figures, with numbers you can check. A first estimate from your electricity bill is free — just send a photo of the bill on LINE.