Start with energy consumption
Look at past kWh 6–12 months, not using the baht amount alone.
Article · Installation budget
How much does it cost to install solar PV on your home? Compare 3, 5 and 10 kWp systems.
Start with a system sized for your actual electricity use, not simply the cheapest package. This guide will help you set a realistic budget and ask installers the right questions.
Short answer
How much do home solar PV cost?
There is no standard price that applies to every home. A meaningful quotation should state the array capacity in kWp, inverter capacity in kW AC, equipment models and quantities, roof type, electrical upgrades, documentation, VAT, and warranties. Compare prices only after a survey and against a clearly defined scope of work.
PTH GREEN will estimate the price on a project-by-project basis from the bill, roof picture, and site survey results. To be able to compare what is actually received
Compare the picture
What is the difference between 3, 5 and 10 kWp panel kits?
| DC panel power | Approximate number of panels | Roof area | Guidelines for use |
|---|---|---|---|
| 3 kWp | Approximately 5–7 panels | Approximately 15–25 sq m. | Small daytime loads; confirm that generation will not regularly exceed consumption |
| 5 kWp | Approximately 8–11 panels | Approximately 25–40 sq m. | Homes occupied during the day, with loads such as air conditioning or water pumps |
| 10 kWp | Approximately 16–22 panels | Approximately 50–80 sq m. | Large homes, home offices, shops, or small businesses |
Panel count and roof area vary with the wattage and physical size of the selected modules. Inverter capacity in kW AC is a design choice and does not always equal the array capacity in kWp.
Choose the size that fits.
Do not directly match your energy bill with the size of your system.
Homes with the same monthly bill may need different system sizes because their electricity-use profiles differ.
Looking for daytime loads
Record air conditioners, water pumps, EVs, and appliances that operate during sunny hours.
Simulate before bidding
Use coordinates, directions, angles, shadows, and actual equipment to estimate yield and proportions for your own use.
PEA uses an electricity bill of approximately 3,000 baht per month or more as just a preliminary screening guideline. It is not a condition to guarantee value for money.
What causes the price to change?
6 factors that cause prices to differ
- Solar panel: Wattage, efficiency, brand and warranty period
- Inverter: Size Model Monitor Function and warranty
- Roof type: Tiles, metal sheets, decks and the difficulty of getting to work
- Original electrical system: Work on improving electrical cabinets, wires, grounding systems, or lights 1 phase/3 phase
- Protective equipment: Circuit Breaker, Surge Cutting Device and safety equipment
- Service scope: Survey, design, document processing, system inspection, warranty and after-sales service.
Before signing the contract
What should a good quotation say?
- The brand, model, wattage and number of panels are clear.
- Inverter brand, model, and size
- Details of the structure, electrical wires, electrical cabinets, and protective equipment.
- Scope of installation work, roof work, and original electrical system work
- Equipment warranty period and installation work warranty
- Whether utility application and connection paperwork is included
- Payment terms and additional expenses that may occur
If you want to check in detail, read more at 10 Key items to check in a Solar Rooftop quotation.
Frequently asked questions
Questions about the price of solar PV
How many kWp should a typical house install?
There is no single system size that suits every home. The right size depends on the electricity bill, daytime consumption, available roof area, and the power demand of major appliances.
Is it better to install a large system first?
Not necessarily. If generation regularly exceeds the daytime load, the return may be lower. A system matched to daytime demand generally uses the investment more efficiently.
Why are the same size quotations so different in price?
Equipment, mounting, protection, scope, warranties, and after-sales service may differ. Compare the detailed inclusions, not only the total price.
Want to know the price that is truly suitable for your home?
Send your electric bill and roof picture to the PTH GREEN team to help estimate the system size and initial budget for free.
Read more: What kind of house is worth it? · How much will you reduce your electricity bill? How many years will you pay back your investment?