How much does it cost to install solar PV on your home? 3, 5 and 10 kWp systems
Compare budget, number of panels, area, and electricity costs suitable for each size.
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Solar Rooftop Manual
Clear, practical solar PV guides before you decide to install
Let's start with the basic article. Then read on about price, value, steps, and choosing an installer. All articles are written for people who do not have a technical background.
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Price · Choose size
Newbie · Check the house
Calculate · Value
Installer · Quotation
Installation · Steps
Selling electricity · Update B.E. 2569 (2026)
From interested to ready to install
Is solar PV worthwhile for your home?
Check the bill, daytime electricity use, roof, shading, and existing electrical system.
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How much to reduce the electricity bill? And how many years will the payback be?
Formula with examples of 3, 5 and 10 kWp that explains assumptions in every step.
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How to choose an installation company? Check 10 points
Check equipment, protection systems, scope of work, documents, and warranties.
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Installation steps until activation
From bill viewing, survey, design, documentation, installation, testing and delivery.
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Can you sell surplus electricity? B.E. 2569 (2026)
Summary: 2.20 baht/kWh, an export offer of no more than 5 kW AC, a 10-year contract, and the application process
Read the article →Basics you should know
Newbie
Before installing
Calculate size
Compare systems
Previous article
What is a Solar Rooftop?
Understand working principles and components without difficult vocabulary.
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5 things you need to know before installing
Summary of size, roof, electrical system, budget, and service provider
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Electricity bill 50,000 baht, how many kWp should be installed?
Example of preliminary system size assessment for a business
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What is the difference between On-Grid and Hybrid?
Compare a battery-free system with a power backup system.
Read the article →Want an answer from your actual bill?
Send your electricity bill to the PTH GREEN team to help estimate your system size, total savings, and initial payback period for free.