Enter your average electricity bill and connected appliances. We'll size the recommended inverter, panel array, and battery — then generate a transparent, itemized quotation using PTG Solar's current price list.
Engineering-basedSizing follows real load calculation, not a flat rule of thumb.
Free to unlockSee your full pricing and 25-year numbers after one quick, no-cost form.
Quick Estimate
Enter your average monthly electricity bill for an instant, ballpark system size — no appliance details needed. Switch to the Detailed Calculator any time for an exact, itemized quotation.
Converted to estimated usage at ₱15/kWh by default — click the ₱ above to use a different rate.
Please enter a monthly bill greater than 0.
Your Estimate
Usage Estimate (from monthly bill)
Recommended System Size
Battery Reserve
See roughly how many hours a battery can run your loads at night.
Aircon Runtime
Add another group below if you have aircons of different sizes.
Other Loads
Optional — add any other running wattage (fridge, freezer, an aircon size not in the dropdown, etc.). Included together with your aircon(s) in the runtime estimate below.
Estimated runtime by battery size
Choose one battery size to see how long it can run your loads — your selection is included in the quotation below.
Simplified estimate — battery usage time = battery capacity ÷ total load (aircon rated power input + any other load entered above). Assumes 100% of battery capacity is usable and doesn't yet include inverter/round-trip efficiency losses, so treat this as a ballpark figure. The 20kWh and 32kWh options are supplied as 2×10kWh and 2×16kWh units respectively.
Your Recommended System — Solis
A ballpark price based on your bill and Battery Reserve selection above — no contact info needed to see this. Want a longer warranty or a cheaper alternative?
1Load Details
2Sizing
3Next Steps
4Quotation
5Projection
Load Details
This drives the sizing estimate below. Your name and location are collected later, only when you're ready to unlock your numbers.
Converted to estimated usage at ₱15/kWh by default — click the ₱ above to use a different rate.
Accounts for wiring/inverter/soiling losses when sizing the recommended panel array. Defaults to 85%.
Average daily hours of full-strength sunlight used to size the recommended panel array from your bill. Defaults to 4.5, typical for the Philippines — adjust for a specific site if you have better data.
Connected Appliances & Load Sizing
Used primarily to size the recommended inverter. Tick "used at night" on any appliance that should also count toward battery sizing.
Aircon
Have aircons of different sizes? Add a separate group for each size below.
Additional / Other Load
Defaults to 1000W to represent your always-on household base load (lights, outlets, fridge, router, etc.) — adjust if needed, or raise it to include other equipment not listed above (e.g. water pump, power tools). Added directly to the Peak Load used for inverter sizing.
Washing Machine
Water Heater
Please go back and enter a customer name, location, and a monthly bill greater than 0 in the section above.
Assumptions used for sizing — 80% battery depth-of-discharge, 96% round-trip efficiency, 4.5 peak sun hours/day by default, 620W panels, 85% solar system efficiency (both peak sun hours and system efficiency are adjustable under Advanced settings). Recommended panel sizing includes a +50% allowance up to 4kW base array size, +45% from 4.1kW to 8kW, and +40% at 8.1kW and above. Panels can't be configured below 50% of the recommended array size, and are capped at 30 panels (PTG Solar's standard pricing table limit). Recommended inverter size = whichever is bigger of (connected motor/appliance load, including the 1kW household base load defaulted under Extra Load and adjustable there) or the total panel array size, rounded up to the nearest available inverter option. For Solis and GoodWe (Tier 1 brands), a small overload headroom is applied first (e.g. up to 6.6kW still uses a 6kW inverter) before rounding up to the next size. 12/16/18/20kW-class systems may use 2 or 3 parallel units of a smaller inverter where that's the only (or cheaper) way to reach that size — a target above 17.7kW always uses 2×10kW, since that's cheaper than 3×6kW. Solis and GoodWe only pair with Tier 1 batteries; Top One's 1.6kW/3.2kW inverters only pair with non-Tier-1 batteries, and its 5.6kW/6.2kW inverters require at least 5kWh. If an aircon/washing machine is non-inverter, its surge wattage is tripled per the load schedule note — checked against the selected inverter, separately from the sizing recommendation itself.
Usage Estimate (from monthly bill)
Inverter & Panel Sizing
Estimated Potential Solar Harvest
Based on your recommended panel array above — the exact figure may shift slightly once you configure a specific package.
Battery Sizing
Get Your Quote
A full, itemized quotation with your recommended package, pricing, and 25-year savings projection.
Get Safety Devices Sizing
Breaker, wire, surge protection, and enclosure sizing for your recommended inverter.
Breaker & Protection Sizing
Auto-sized from your recommended inverter — PTG Solar confirms final sizing on site before installation.
Your safety device sizing is ready.Unlock the full breakdown — free, takes 10 seconds.
Package Options
Pre-filled with the recommended inverter, panel count, and battery for each brand — all editable. Prices come directly from PTG Solar's current price list.
Your pricing is ready.Unlock the full breakdown for every package — free, takes 10 seconds.
Quotation
This is what PTG Solar will present to you. Volume discounts on panels & installation are applied automatically for 10+ panel systems; any further discount is applied manually, offline. Final quotation will be verified upon site visit.
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Your quotation is ready.Unlock the full itemized total — free, takes 10 seconds.
PTG Solar Quotation Total₱0
25-Year Financial Projection
Meralco-only cost vs. the selected solar package's net position, both escalated at the same forecasted electricity rate.
Note — panel degradation basis: every figure in this section (both payback periods, all seven investment ratios, and the chart/table below) assumes solar output declines over time rather than staying constant — it does not assume your panels perform at year-1 output for all 25 years. This follows the actual manufacturer warranty curve for the JA Solar JAM66D45 LB (620W) panel used in this system: 1% degradation in year 1, then a flat 0.4%/yr afterward (linear, not compounding), matching JA Solar's published 30-year linear performance warranty of at least 87.4% of rated output remaining at year 30.
Payback Summary
Like what you see?Unlock your full ROI, IRR, NPV, and 25-year breakdown — free, takes 10 seconds.
Investment Ratios
Meralco Rate Increase vs. Projected Household Demand Growth
Forecasted Meralco rate (₱/kWh, left axis)Projected household demand (kWh/mo, right axis)
Demand growth basisMeralco rate forecast basis
Demand growth assumes 5.5%/yr compounding (Base Case), based on Philippine DOE distribution-utility planning (~5–5.5%/yr through 2028–2040) and the historical 1982–2015 residential trend (5.8–5.96%/yr), driven by rising household income, electrification, and appliance/cooling ownership.
Note — basis for this forecast: PTG Solar uses a deliberately conservative Base Case of 6%/yr for the Meralco rate escalation shown above and used throughout this projection. Meralco's actual residential rate rose from a pandemic-era low of about ₱8.3/kWh (March 2021) to about ₱14.35/kWh (April 2026) — roughly 10–11%/yr over that stretch — while the longer 10-year historical average (2016–2025) runs closer to 5%/yr. PTG Solar models three scenarios: Conservative 4%/yr (below the 10-year historical average, a lower-bound planning case), Base Case 6%/yr (the figure used throughout this projection — deliberately below both the long-run average and the recent post-pandemic trend, so as not to overstate your savings), and Aggressive 8%/yr (a stress-test case, still below the actual realized rate of increase from 2021–2026). Source: Meralco's official monthly rate announcements, 2021–2026.
Cumulative Savings vs. Total Expense (15-Year View)
Cumulative Meralco cost (no solar)Net solar position (savings − system cost)
Opens your browser's print dialog — choose “Save as PDF” as the destination to download it.
The Full Quotation includes your selected inverter, panel count, and battery size, plus the matching breaker & protection sizing, financial projections, and a 25-year year-by-year table.
The Simple Quotation is one page — just your estimated monthly savings, payback period, and system price.
Prefer to just message us? Contact PTG Solar directly →
Get Your Full Quotation
Your full 25-year proposal — including the bill of materials and breaker/wiring sizing — is ready.
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PTG SOLAR
PTG Solar · Power Through Grace
PTG Solar
Power Through Grace
Solar System Proposal & Quotation
Prepared For
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Prepared By
PTG Solar
Quezon City, Philippines
Based on your household's electricity usage and connected appliances, PTG Solar has
engineered a solar power system sized specifically for your home — not a generic,
one-size-fits-all package. This proposal outlines your recommended system, transparent
itemized pricing, and the long-term financial return you can expect, backed by an
engineering-led approach to sizing, safety, and installation.
01Load & Usage Summary
02Recommended System & Pricing
Final quotation will be verified upon site visit.
PTG Solar Proposed Investment₱0
03System Specification & Protection Sizing
For roof-mounted solar installations. Breaker, wire, and safety device sizing below is derived directly from your selected package's inverter rating, using PTG Solar's engineering reference table.
04Why Solar, Why Now
Meralco's rate has consistently trended upward year over year, while your solar
system's cost is locked in the day you install it. Every year you wait is a year of
rising grid bills a solar system could already be replacing.
₱12.43/kWh
🇵🇭PHILIPPINES
>
🇸🇬SINGAPORE
Highest in Southeast Asia — June 2026
Source: Department of Energy
What’s Driving This
🛢
Pass-Through Rates
~80% of your bill, no cap
⚡
Weather & Outages
Heat strains grid, plants fail
🚢
Imported Fuel
PH buys coal & LNG abroad
💱
Peso vs. Dollar
Record low: ₱61.85/$1
Looking ahead
🏭
Pax Silica
New chip hub, more demand
🌡
Super El Niño
Extreme heat, more aircon use
⚠ YOU DON’T CONTROL THIS.
☀ SOLAR MEANS YOU DON’T HAVE TO.
Where Else Could This Money Go?
A direct comparison against three common alternative uses of the same capital — using your actual selected package cost, not a generic assumption.
05Your Investment Snapshot
Investment Ratios
0625-Year Year-by-Year Projection
Meralco cost assumes no solar and the same rate escalation shown above. Solar net
position is cumulative savings and surplus value minus the system cost — the
row marked "payback" is the year that turns positive for good.
07What's Included
Full site survey, system design, and load-based sizing
Professional installation — panels, inverter, mounting, cabling, grounding
Combiner box with breakers, SPD, and battery/PV cabling, sized to your system
Solar panel-to-inverter cables and accessories, included up to 15m — additional charges may apply for longer runs
System commissioning and walkthrough
Aftersales troubleshooting consultation
Disclaimer: Every rooftop produces a little differently — sunlight hours, shading, roof orientation and tilt, seasonal weather, and equipment performance all shape your system's real-world output. The figures above are conservative engineering estimates; our technical team fine-tunes the design during a site assessment to give you the most accurate picture before you invest.
Fees not included: The price in this proposal covers the solar system and installation only. It does not include third-party or government fees outside PTG Solar's control — e.g. LGU permits, net metering application/registration with your utility, Homeowners Association (HOA) fees, and similar charges. These vary by location and are the customer's responsibility.
