Thai Solar Insights
Executive Summary & Sizing
Based on your monthly electricity bill of 6,000 – 8,000 THB, we recommend a 10 kW Solar System. This size will generate roughly 1,200 – 1,350 kWh per month, effectively neutralizing the highest tier rates of your MEA/PEA utility bill. Below is an analysis of your property space, system options, and expected return on investment in Thailand.
Rec. System
10 kW
Avg. Daily Yield
40 kWh
CapEx Est.
280k THB
Est. ROI
5 – 6 Yrs
🏡 1. Space & Feasibility
Assessing if your 90 sq.wa property can accommodate a 10 kW system. Solar panels require unshaded, preferably South or West-facing roof space.
Total Land Area (90 sq wa)
360 m²
Est. Roof Area (80%)
288 m²
Required for 10kW
~50 m²
✔️ Feasibility Status: Excellent. You have abundant roof space for current and future expansions.
🔋 2. System Architecture Selection
Understand the differences between On-Grid, Off-Grid, and Hybrid systems to make an informed capital decision. For urban/suburban homes in Thailand, On-grid is usually optimal.
💰 3. ROI & Daytime Usage Simulator
Solar panels generate power during the day. Your return on investment drastically changes based on how much power you consume directly (saving ~4.7 THB/unit) versus how much you sell back to the grid (earning ~2.20 THB/unit via net-billing). Select your estimated daytime usage below to simulate financials.
Example: 30% means no one is home, only fridge/standby. 70% means working from home with A/C running.
Direct Savings
— THB/mo
@ 4.7 THB/unit
Sell to Grid
— THB/mo
@ 2.20 THB/unit
Total Monthly Benefit
— THB
Break-even in: — Years
10-Year Cumulative Cash Flow (THB)
🛠️ 4. Maintenance & Lifecycle
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Panel Cleaning (2x / Year)
Dust reduces efficiency. Professional cleaning costs ~2,000 – 3,000 THB per visit. Est: 5,000 THB/yr.
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✔️
Inverter Replacement (Year 10-12)
While panels last 25 years, the inverter (the brain) typically needs replacement around year 10. Budget ~40,000 THB.
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Warranty Coverage
Tier 1 panels usually have a 12-year product and 25-year performance warranty. Inverters typically carry 5 to 10 years.
💵 5. Tax Benefits & Selling Options
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Net-Billing Program (ขายไฟคืน)
Currently, PEA/MEA allows residential users to sell excess power back to the grid at exactly 2.20 THB/kWh for a contract period of 10 years. Requires a special two-way meter installation.
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Tax Deductions (Corporate vs Individual)
For residential (individuals), there are currently no direct personal income tax deductions for installing solar. The benefit is entirely in bill reduction and net-billing income. BOI tax benefits are strictly for registered businesses/factories.
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Permits Required
Installation requires permits from the local municipality (Or Bor Tor / Khet), the ERC (Energy Regulatory Commission), and the utility provider (PEA/MEA).