Solar Tools

Useful Numbers to Check Before You Decide.

Four Philippine-specific calculators using recent utility rates, irradiance references, and published assumptions. Each calculator shows its own sources and data cutoff.

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ROI Calculator

A practical savings estimate using recent PH utility rates and irradiance references.

Appliance Load Calculator

Build a rough system-size starting point from appliances and daily usage.

Solar Savings Bill Breakdown

Compare a modeled bill before solar with the charges solar may reduce.

Net Metering vs. Zero-Export

Compare the tradeoffs between waiting for net metering and starting zero-export.

Data Sources and Cutoff

Each calculator uses its own source set.

These tools combine public rate references, local solar assumptions, and user-entered inputs. The summaries below show the current cutoff for each calculator; open a calculator for its full estimate notes and limitations.

Solar ROI Calculator

Rates last reviewed: July 4, 2026

Open

Meralco June 2026 residential typical-consumption and generation-charge tables
Davao Light June 2026 Original Franchise Area residential and generation-charge tables
Visayan Electric official rate page reviewed July 2026; Cebu numeric table not available, so the prior sourced retail value remains
Net-metering export credit assumptions based on utility generation-charge treatment
Philippine peak-sun-hour references, residential installed-cost benchmarks, and IEA 2023 grid emissions factor fallback

Appliance Load Calculator

Assumptions last reviewed: April 26, 2026

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Default appliance wattage presets maintained in Solar Scout PH calculator data
Philippine peak-sun-hour references by region
Residential installed-cost brackets and the shared solar system derating factor

Solar Savings Bill Breakdown

Bill breakdown cutoff: April 2026 (partial)

Open

Meralco April 2026 rate advisory: generation charge (₱8.3864/kWh) and transmission delta (−₱0.0656/kWh) updated; system loss, distribution, and other charges pending full April advisory PDF
Generation, transmission, system loss, distribution, subsidy, universal charge, other-charge, meter-charge, and VAT assumptions in the bill decoder module

Net Metering vs. Zero-Export Calculator

Rates and fee assumptions last reviewed: July 4, 2026

Open

Meralco June 2026 generation-charge reference for exported-energy credit assumptions
Davao Light June 2026 generation-charge reference for Davao exported-energy credit assumptions
Residential bi-directional meter replacement cost cap used as the net-metering application-fee default
Approval-delay and zero-export comparison assumptions maintained in the calculator module

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