Free Solar Calculator
Size your solar system and get an instant quotation
Enter your monthly bill or list your appliances. We'll recommend panels, inverter, and battery, then build an itemized estimate you can print or send to us.
Load calculator
2. Tell us about your usage
Check the total on your latest Meralco or cooperative bill.
Total bill ÷ kWh used, as shown on your bill.
Want a more precise result, or need to size backup for specific loads? Switch to and list your appliances.
Advanced settings
About 4.5 in Central Luzon.
Wiring, inverter, heat, and dust losses.
Credit for solar you can't use or store. Only reduces the part of your bill solar doesn't already cover.
Usable share of LiFePO4 capacity.
Used for the 25-year projection.
Your recommendation
6.3 kWp hybrid system
Based on 12.66 kWh/day (380 kWh/month) of usage.
Solar panels
10 pcs
630 W each · ~29 m² roof
Inverter
5 kW
With backup output
Battery
16 kWh
Covers 100% of night use · ~9.1 hrs backup
Solar output
680 kWh
Estimated per month
Batteries are added 16 kWh at a time. Larger banks need a larger inverter to keep them charged.
Indicative investment
₱316,283 – ₱386,568
- Monthly savings
- ₱6,000
- Bill offset
- 100%
- Payback
- ~4.6 years
- 25-year savings
- ₱2,788,498
How It Works
How the calculator sizes your system
The same first-pass method our engineers use before a site visit. You can adjust every assumption under Advanced settings.
Your daily energy use
Quick Estimate converts your bill to kWh using your electricity rate and splits it by how much you use by day versus at night. Detailed mode adds up watts × quantity × hours for every appliance, split into daytime and night use.
Solar array size
Daily energy ÷ (peak sun hours × system efficiency) gives the kWp needed, rounded up to whole panels. Hybrid and off-grid arrays are also sized to fully recharge your battery bank every day, after covering your daytime use.
Inverter size
Hybrid inverters come in 5, 6, 8, 10, 12, and 16 kW, and grid-tied in 3, 5, 6, 8, and 10 kW. Bigger systems use matching inverters in parallel. The inverter must match the array, carry the loads running at the same time (including motor startup surge), and be large enough to keep your battery bank charged.
Battery size
Batteries come in 16 kWh units. Hybrid batteries cover your night-time use, and off-grid batteries also cover the days of autonomy you choose. More batteries need a bigger inverter: a 6 kW inverter can keep one 16 kWh battery charged, but not two.
Savings and payback
Solar first runs your daytime load. The surplus charges the battery for night use, so night-heavy homes save mostly through battery capacity. Anything left is exported and credited at the lower net-metering rate, up to the rest of your bill.
Indicative pricing
The quotation is an itemized bill of materials built from our current price list: inverter, batteries, panels, safety devices, mounting system, wire, and accessories, plus installation at ₱10.25 per watt of panels. Final pricing depends on roof type, wire runs, and site conditions confirmed during a site assessment.
Please note: Results are estimates for planning purposes only and are not a binding offer. Actual output depends on roof orientation, shading, weather, and equipment chosen. A formal proposal follows a site assessment.