🧮 TL;DR — The 3-Step Solar Panel System Size Calculator
- Find your average monthly kWh — it's printed on your Meralco or VECO bill.
- Divide by 30 to get your daily kWh usage.
- Divide by 4 (average peak sun hours in the Philippines). That's your minimum kW system size.
Quick example: PHP 8,000 Meralco bill ≈ 400 kWh/month → 400 ÷ 30 ÷ 4 = 3.3 kW → go with a 4kW or 5kW system.
Most Filipino homes fall between 3kW and 10kW. The sections below help you land on the right tier — and stop you from overspending on the wrong one.
The singil sa ilaw arrives and your stomach drops. PHP 7,500. PHP 9,000. Sometimes more. Solar is the obvious fix — but then you're staring at options from 3kW to 10kW with price tags ranging from PHP 150,000 to nearly half a million pesos. Too small and you're still paying Meralco half your bill every month. Too big and you've burned PHP 80,000 you didn't need to spend.
Here's the truth most installers won't say upfront: the math is simple. Three steps, two minutes, one number. The formula above is your solar panel system size calculator for the Philippines — all it needs is your latest bill.
Which System Size Is Right for You? Sulit ba ang Bawat Option?
Run the formula. Round up to the nearest standard size. Then use this table to pressure-test that number against real costs and real savings.
| System Size | Best For | Approx. Installed Cost | Covers (Monthly) | Typical Meralco Bill Before Solar | Est. Monthly Savings |
|---|---|---|---|---|---|
| 3kW | Small condo or apartment | PHP 150,000–180,000 | ±150 kWh/month | PHP 2,500–4,000 | PHP 1,200–1,800 |
| 5kW | Average Filipino home | PHP 220,000–260,000 | ±250 kWh/month | PHP 5,000–8,000 | PHP 2,500–3,500 |
| 8kW | Larger home or small business | PHP 340,000–390,000 | ±400 kWh/month | PHP 8,000–12,000 | PHP 4,000–5,500 |
| 10kW | Big household or SME | PHP 420,000–480,000 | ±500 kWh/month | PHP 12,000+ | PHP 6,000–8,000 |
Kung ang singil mo ay above PHP 6,000 a month, a 5kW system is usually the sweet spot. It covers most daytime kuryente, qualifies for Meralco net metering, and pays itself off faster than the bigger tiers. Don't size up just because a salesperson tells you to.
3 Things That Affect Your System Size (Hindi Lang ang Bill)
The formula gives you a baseline. These three factors can push you one tier higher — and ignoring them is the most expensive mistake homeowners make.
The Philippines averages 4–5 peak sun hours per day — your system works harder here than in most countries. The 4-hour divisor in the formula is deliberately conservative. Across much of the Visayas and Mindanao, peak sun hours are closer to 5, which means your system often outperforms the initial estimate.
"Take Dante, a homeowner in Cavite — his PHP 9,500 Meralco bill translated to roughly 475 kWh/month. The formula pointed to a 4kW system. But he ran two inverter aircons and had an EV coming in 2027. He went with 8kW. Two years later, his bill is under PHP 800 a month."
Frequently Asked Questions
Is a 3kW solar system enough for a typical Filipino home?
For a small home or condo with a Meralco bill below PHP 4,000 a month, yes — a 3kW system handles most daytime kuryente. Run multiple aircons or have a larger family? A 5kW is the safer call. Undersizing is a mistake you'll feel every month on your bill.
Magkano ang 5kW solar system sa Philippines in 2026?
A fully installed 5kW solar system in the Philippines typically runs PHP 220,000–260,000, depending on the panel and inverter brand. That figure includes permits and net metering application support — get skeptical of any quote that strips those out.
How many solar panels do I need for a 5kW system?
Most 5kW systems use 10–13 panels rated at 400W–500W each. Plan for roughly 20–26 sqm of unshaded roof space, ideally south- or west-facing for maximum sun exposure in the Philippines.
Can I add battery storage to any of these systems?
Yes — any of the standard system sizes can be paired with a battery bank, but it adds PHP 80,000–150,000+ to the cost depending on capacity. For most Meralco customers on net metering, batteries don't pay back fast enough yet. Prioritise getting the right system size first; storage can be retrofitted later when prices drop further.
Bottom Line: Huwag Mag-over-buy (or Under-buy)
Run the three-step formula on your latest bill: monthly kWh ÷ 30 ÷ 4 = your minimum system size in kW. Pick the closest standard size from the table, factor in your roof space and any appliances you're adding in the next two years, then get a proper site assessment before signing anything.
For most Filipino homes, a 5kW–8kW system hits the sweet spot between upfront cost and meaningful bill reduction. Anything smaller risks leaving money on the table every month; anything larger needs the roof and the load to justify it.
Ready to find out exactly which system fits your home?
Get a Free System Recommendation →No hard sell. A proper site assessment and a straight answer — that's it.
Quick Savings Estimate
Get a Free Quote
Custom system design
