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Solar Guide
How to calculate the cost of your solar panel system
Solar gets more affordable every year as demand grows. Here’s how to estimate your electricity needs, the number of panels, and the total installed cost of a system in the Philippines — before you ever request a quote.
Work out your electricity usage
Pull your last 12 months of electric bills and average the monthly kWh. Divide that monthly figure by 30 for a rough daily average. Usage climbs in hot months when the aircon barely rests, so a full-year average is the fairest basis to size against.
Estimate the panel cost
The panels themselves run roughly ₱11–₱12 per watt, with premium brands costing more. Multiply your recommended wattage by that rate for an approximate panel-only cost — for example, a 4,000 W array works out to about ₱44,000–₱48,000 in panels.
Add installation
Installation prices keep falling — down more than 70% over the past decade, according to the Solar Energy Industries Association. Once mounting, wiring, and labour are included, a complete installed system in the Philippines typically runs from around ₱145,000 up to ₱800,000 or more, depending on size and complexity.
Rule of thumb
Installed cost: ₱30,000–₱50,000 per kW
On average, a fully installed system in the Philippines costs ₱30,000–₱50,000 per kW — panels, inverter, mounting, and labour all included. That’s the figure to plan around.
No bills handy? Estimate by floor area
If you can’t pull your bills, you can approximate annual electricity consumption from your home’s floor area, then size the array from there.
5,500 kWh
30 m² home / yr
9,000 kWh
50 m² home / yr
12,500 kWh
75 m² home / yr
15,500 kWh
100 m² home / yr
18,500 kWh
120 m² home / yr
How many panels do you need?
Divide your annual consumption by the local solar radiation and the power of one panel. Here’s the method with a worked example.
Sizing example
Annual use 4,500 kWh · Average solar radiation ~1,000 kWh/m²/yr · One panel 0.25 kW
Panels = (4,500 ÷ 1,000) ÷ 0.25 = 18 panels ≈ 4.5 kW
Indicative cost = 4.5 kW × ₱30,000 = ₱135,000
Panels needed by system size (≈425 W panels)
3 kW
7–8 panels
5 kW
11–12 panels
6 kW
14–16 panels
9 kW
21–25 panels
10 kW
23–25 panels
12 kW
28–30 panels
4,000 W
~10 panels
5 kW inverter
12–15 panels
Panels needed by house size
50 m²
2–3 panels
100 m²
4–5 panels
120 m²
5–6 panels
150 m²
6–8 panels
200 m²
8–10 panels
300 m²
12–15 panels
Frequently asked questions
How many panels to charge an electric car?
Around 10–20 panels (about 5–10 kW), depending on the car’s battery size and how far you drive.
How many panels for a self-sufficient home?
For an off-grid / autonomous house, roughly 20–30 panels totalling about 10–15 kW, plus battery storage.
How many panels for a 5 kW inverter?
About 12–15 panels at 425 W each to properly match a 5 kW inverter’s output.
Does roof orientation matter?
Yes — orientation, roof pitch, and shading all affect output. A quick site assessment confirms the exact panel count and placement for your roof.
These are planning estimates
Your roof orientation, tilt, and shading change the final numbers. A free SolarLab site assessment pins down the exact panel count and installed cost for your property. Talk to a solar specialist →