Adjust the sliders to see your projected output, savings, and 25-year ROI. Figures use the official Panasonic N-Type TOPCon Bifacial 625Wp datasheet (AE13TDXXXTHC16B5) and the latest verified Meralco rate of ₱13.8161/kWh (March 2026).
Bill Calculator
From your Meralco bill to the right system size
Slide your monthly bill below. We compute your kWh usage, the system size needed to offset roughly 80% of consumption, and the projected bill if Meralco rates keep climbing at the rate you set.
Recent Meralco rate history (2025–2026)
Mar 2025
₱12.29
₱12.29
Apr 2025
₱13.01
₱13.01
Oct 2025
₱13.32
₱13.32
Jan 2026
₱12.95
₱12.95
Feb 2026
₱13.17
₱13.17
Mar 2026 ★
₱13.8161
₱13.82
Your bill & usage
₱10,000
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Est. monthly kWh consumed
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Daily kWh usage
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Recommended system (offsets ~80%)
Projected bill if Meralco keeps raising rates
5.0%
Historical average: ~5–8%/yr based on 2024–2026 Meralco data.
Year 5
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Projected ₱/kWh
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Bill if no solar
Year 10
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Projected ₱/kWh
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Bill if no solar
Year 25
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Projected ₱/kWh
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Bill if no solar
Total paid to Meralco over 25 years without solar
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Panel Comparison
What you lose with generic PERC panels
Panasonic N-Type TOPCon Bifacial panels lose less output to heat than generic PERC. On a typical 55°C tropical rooftop, that gap turns into measurable peso savings every single day.
8 kW
Include bifacial rear gain?
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Panasonic TOPCon kWh/day
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Generic PERC kWh/day
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Extra savings per year
Panasonic temp. coefficient: −0.29%/°C
Generic PERC temp. coefficient: −0.37%/°C
Roof temperature assumed: 55°C
Meralco rate: ₱13.8161/kWh
Peak sun hours: 5.0 hrs/day
Source: Panasonic datasheet AE13TDXXXTHC16B5
Bifacial Gain
Extra savings from bifacial rear-side generation
Panasonic TOPCon Bifacial panels generate additional electricity from light reflected off the roof onto the rear surface. The datasheet rates rear-side gain between five (5) and twenty-five (25) percent depending on roof albedo.
8 kW
10%
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Extra kWh/day from rear surface
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Extra kWh per year
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Extra ₱ per year
True Cost
Cheap vs. quality solar over 25 years
A bargain installer often becomes the most expensive choice once early failure, replacement, and undersized hardware are factored in. Slide to size your system and compare the real twenty-five (25) year cost of each tier.
Estimates only. Actual savings depend on roof orientation, shading, consumption pattern, and Meralco rate movement. Figures use the March 2026 Meralco rate (₱13.8161/kWh) per official advisories.
