One of the most important decisions when buying solar panels is choosing the right size. An undersized system leaves you paying more to CFE than needed. An oversized one is money thrown away on excess that CFE settles at very low price. Here’s how to get it right.
The basic calculation (5 steps)
- Add the kWh from your last 6 bimonthly bills (full year).
- Divide by 12 for your monthly average.
- Identify the peak sun hours in your city.
- Calculate:
monthly consumption / 30 days / peak hours × 1.15 = kWp needed. - Divide kWp by panel power (typical 440W = 0.44 kWp) → number of panels.
Peak sun hours by city
- Mexicali: 6.5
- San Luis Río Colorado: 6.4
- San Felipe: 6.7
- Tecate: 5.8
- Ensenada: 5.6
- Rosarito: 5.5
- Tijuana: 5.4
Conclusion
Sizing correctly is science + experience. At I-Vert Energy our engineers analyze your specific case considering all factors. Request free analysis.
