Solar ROI Calculator

Enter your bill and usage below — we'll size your system, calculate the exact panel and battery configuration, and show you the 25-year return for all three setup types.

System Size14.4 kWp23 × 625W panels
Investment₱811,590incl. 15.4 kWh battery
Annual Savings₱180,000vs. ₱15,000/mo today
Payback4.5 yrs₱6,054,762 25-yr net return

% of electricity used at night (6 PM – 6 AM). Drives battery size.

Equipment

₱7,500/panel
₱28,000/unit
₱42,000/module
₱2,500

System Setup

Battery vs. Panels — Cost Curve

All three setups are points on one curve. As battery grows, fewer panels are needed. The minimum cost marks the optimal balance.

● A — Grid-tied+NM (0 battery)★ C — Optimal mix● B — Full independence▐ Bars = panels required— Cost line
★ Optimal (C): 0.0 kWh battery · 30 panels · ₱649,155 (+NM)

ResilienceHybrid + Net Metering

Battery powers the heavy evening hours daily — brownout protection built in. Net metering credits cover sleeping hours. Best balance of protection and ROI.

PV Array
Panels23 × 625W = 14.40 kWp
String config3 strings, 10 in series
String Voc476.0 V
Inverter5 kW — Deye SUN-5K-SG04LP1
Roof required52.4 m²
Annual Generation16,172 kWh
Battery Bank
ModelDyness DL5.0F
Configuration3P × 1S = 3 units
Total Capacity15.4 kWh usable
Replacement (Year 12)₱126,000
Pricing Breakdown
Equipment cost₱329,000
Other costs (70%)₱230,300
Net Metering fee₱65,000
Subtotal₱624,300
Margin (30%)₱187,290
Client price₱811,590
Financial
Annual Savings₱180,000
Simple Payback4.5 years
CO₂ Offset / Year11.5 tonnes
25-Year Net Return₱6,054,762
Meralco (25yr, no solar)₱7,496,263

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