Solar Panel Calculator Philippines 2026 (ROI & Payback)
Estimate your payback period, monthly savings, and 25-year total savings if you install rooftop solar — compared to staying on Meralco. Includes net metering credits and PH-specific sun-hour averages.
Your details
Your projected savings
Payback Period
4.6 years
Then 20+ years of free electricity
Generation & Financial Breakdown
Typical Residential System Sizes
3 kW
For ₱3,000–5,000 bills
~₱150,000
8 × 400W panels
5 kW
For ₱5,000–8,000 bills
~₱275,000
12 × 400W panels
8 kW
For ₱8,000–14,000 bills
~₱440,000
20 × 400W panels
10 kW
For ₱14,000+ bills
~₱550,000
25 × 400W panels
How solar works in the Philippines
The Philippines gets 4.5–5 peak sun hours per day on average, one of the highest in Southeast Asia. A 1 kW solar system generates roughly 4.5 kWh per day, or about 135 kWh per month.
Solar panels work even on cloudy days (at 20–40% efficiency). System output gradually degrades by ~0.5% per year — a quality system still produces ~88% of original output at Year 25.
Best for: Houses with south-facing or east-west roofs, daytime electricity users (work from home, kids in online class), and bills above ₱4,000/month.
Net metering explained
Under the RE Law (RA 9513) and ERC Resolution 09-2013, Meralco allows you to export excess solar energy to the grid for bill credits:
- Your meter runs backward when you produce more than you use
- Credits offset your bill for night-time grid consumption
- Max 100 kW system size for residential
- Application + bidirectional meter installation: ~3–6 months
- One-time application fee: ~₱5,000–15,000
Net metering is the cheapest path. Battery is only needed if you want full off-grid or backup during outages.
The hidden value of solar
- Inflation protection. Meralco rates rose ~25% over the last 10 years. Your solar “rate” stays at ₰0/kWh for generation — protects you from future hikes.
- Property value boost. Studies in the US show solar adds 4% to home value. In the PH, the boost is smaller but real, especially for buyers worried about utility costs.
- Outage protection (with battery). Hours of backup during typhoon outages — important for tropical PH.
- CO₂ reduction. A 5 kW system avoids ~4 tons of CO₂ per year — equivalent to planting ~70 trees.
- BIR depreciation. Business owners can depreciate the system as an asset over 10 years.
Red flags when shopping installers
- No DOE / ERC accreditation. Use only Department of Energy-accredited installers. List at doe.gov.ph.
- Quotes more than 30% above market. Get 3 quotes minimum. Market is ₱45–60K/kW installed.
- No 25-year panel warranty. Quality panels (LG, REC, JinkoSolar, Trina) come with 25-yr performance warranty.
- 5-year inverter warranty only. Push for 10-yr minimum on inverter (most expensive replacement part).
- Cash-only deals. Use BDO Solar Loan, BPI Eco Loan, or Cards for protection & 0% installment.