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FactoryCommercialHome

Monthly power bill300,000 THB

Bill (type it) Roof area m² (optional)

Estimated saving฿2,699,200a year · ฿224,933 a month

Recommended system: 482 kWp
Estimated investment: ฿12,532,000
Payback: 4.7 yrs (4.4–5.1)
CO₂ avoided: 320.5 t/yr
Net gain over 25 years: ฿64,376,521

Needs about 3,133 m² of roof. Based on a tariff of 4 THB/kWh

Monthly output (kWh)

JFMAMJJASOND

Total 674,800 kWh a year; the rainy season (Jun–Sep) yields about 25% less than the hot season

Buy outright vs PPA

	Buy	PPA
Investment	฿12,532,000	฿0
Year-1 saving	฿2,699,200	฿323,904
25-year net	฿64,376,521	฿40,194,265

PPA: no investment, power from the system at 12% below the utility for 15 years, then the system is yours

Estimated corporate tax benefit ฿1,253,200 (extra 50% deduction for certified energy-saving equipment; confirm with your auditor)

Assumptions: tariff 4 THB/kWh rising 2% a year · yield 1,400 kWh/kWp/yr ±8% · degradation 0.5% · O&M 1% of capex a year · inverter swap in year 12 · CO₂ 0.4750 kg/kWh (อบก. (TGO) Scope 2 ปี 2569) · as of พ.ย. 2569, a first estimate ±15%

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