Solar Calculator Philippines 2026

Why Solar Pays Back Fast in the Philippines

Filipino households pay some of the highest electricity prices in Asia. Meralco residential rates have hovered around ₱13-14 per kWh through 2026, with the generation charge alone climbing past ₱8. Pair that with 3.7-3.9 kWh of output per kW of panels per day across most of Luzon and the Visayas, and rooftop solar routinely pays for itself in three to five years — among the fastest paybacks anywhere. Start with the solar savings calculator to see your own numbers.

How Net Metering Works Under ERC Rules

The net metering program created by the Renewable Energy Act (RA 9513) lets systems up to 100 kW connect to your distribution utility. The key detail many installers gloss over: exports are not credited at your full retail rate. Your utility credits surplus energy at its blended generation charge — roughly ₱7-8 per kWh, or about half of what you pay. That asymmetry means the economics improve sharply the more solar you consume directly.

• Apply through your utility (Meralco or your local electric cooperative), which handles inspection and the bidirectional meter swap.
• Credits offset your generation charges on future bills.
• Timelines vary — Meralco applications often complete in one to three months; some cooperatives take longer.

Worked Example: 5 kWp in Metro Manila

A 5 kWp system at roughly ₱55 per watt costs about ₱275,000 installed. At 3.7 kWh/kW/day it generates near 6,750 kWh a year. If you self-consume 60% (offsetting ₱13/kWh) and export 40% (credited at ₱7/kWh), annual savings land around ₱72,000 — a payback near 3.8 years, with panels warrantied for 25. Size the array against your bill with the system size calculator and check your roof with the roof area tool.

Typhoon Country: Mounting Matters

The Philippines sees 15-20 typhoons a year, so insist on mounting hardware rated for at least 240-270 km/h wind zones per the structural code, through-bolted rails rather than clamps on old roofing, and a roof inspection before install. A cheap racking job is the most common cause of storm losses, not the panels themselves. Brownout-prone areas should also price a battery using the battery bank calculator, since grid-tied systems shut down during outages unless you add storage.

Caveats

Meralco rates move monthly, and provincial cooperative rates can be lower than Metro Manila levels, which stretches payback. Export crediting rules and the 100 kW cap are periodically reviewed — verify current terms with the ERC (erc.gov.ph) and the Department of Energy before signing. Cloudier months in the wet season cut output 20-30%, so run the solar output calculator with conservative assumptions rather than an installer's best-case brochure figure.

Solar calculators for other countries

Localized subsidy and tariff math for more markets:

Frequently asked questions

Residential grid-tied systems typically run ₱50-60 per watt installed, so a common 5 kWp home system costs roughly ₱250,000-300,000 before batteries. Hybrid systems with storage cost substantially more.

Exports are credited at the utility's blended generation charge — roughly ₱7-8 per kWh in 2026 — not the full retail rate of ₱13-14. Self-consuming your solar is worth nearly twice as much as exporting it.

No. Grid-tied inverters must shut down during outages for line-worker safety. To keep lights on through brownouts and typhoon-related outages you need a hybrid inverter with a battery bank.

Quality panels are tested to high wind and impact loads, but the racking is what fails first. Specify mounting engineered for your wind zone under the structural code and have the roof structure checked before installation.

About 11 kWh a day or 4,104 kWh a year on average, from about 10.0 a day in July to 13.0 a day in March, according to PVGIS data for panels at the best fixed angle. Shading, dust and orientation change the result.