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Solar and backup power in Iloilo
Iloilo, Western Visayas, gets 5.17 peak sun hours a day on average. The dullest month is December at 4.5 hours, 30% less than April, the sunniest at 6.42. That makes it sunnier than 80% of the 21 cities we cover in the Philippines.
Sunshine in Iloilo is steady through the year: even December, the dullest month, is within 15% of the yearly average, so a system sized for it is barely bigger than one sized for an average month. Across the year, Iloilo gets 3% more sunshine than the average of the cities we cover in the Philippines.
What a home in Iloilo needs
Three example homes, each covering a 12-hour daily outage with a lithium battery and solar panels to recharge it. Panels are 450 W. The month-with-least-sun figure is what keeps you covered all year.
| Home | Inverter | Battery | Panels, December | Panels, yearly average |
|---|---|---|---|---|
| Essentials 6 lights, 2 fans, a fridge, TV, Wi-Fi and phone charging | 1 kW | 2.6 kWh | 2 | 2 |
| Family home Essentials plus a freezer, more lights, a laptop, a desktop and a water pump | 3 kW | 7.4 kWh | 4 | 4 |
| With air conditioning The family home plus two small air conditioners for 6 hours a day | 5 kW | 14.9 kWh | 8 | 7 |
Your own appliances will differ. Put them into the calculator below, which already has Iloilo's sunshine.
Size your own system in Iloilo
Planning tips for Iloilo
- Size panels for December, not for the yearly average. A system sized on the average falls short in the dullest weeks, which is when you most need it.
- Dust, heat and shade cut output. Keep panels clean, leave air space under them, and avoid anything that shades them between mid-morning and mid-afternoon.
- Ask installers for the inverter's continuous and surge ratings, the battery's usable capacity and chemistry, and the panels' total watts. Compare those numbers with your plan rather than the package name.
Guides for planning in Iloilo
- Peak sun hours and your dullest month
- How many solar panels you need
- Lithium vs lead-acid batteries
- Questions to ask an installer
Nearby cities
- Bacolod City 42 km · 5.17 h
- Kalibo 115 km · 4.83 h
- Cebu City 151 km · 4.99 h
- Pagadian 333 km · 5.38 h
- Cagayan de Oro 336 km · 5.04 h
- Calapan 337 km · 4.97 h
Sunshine: NASA POWER climatology, ALLSKY_SFC_SW_DWN, monthly averages for 25-year Meteorological and Solar Monthly & Annual Climatologies (January 2001 - December 2025), at 10.6969, 122.5644; retrieved 2026-11-09. Peak sun hours equal kWh of sunlight per square metre per day on flat ground; tilted panels usually collect a little more.