Power Your Home Smarter.
Build your appliance list once. Get battery runtime, solar sizing, inverter size, cable and fuse ratings, and real peso costs — all in plain English.
Popular tools
Start with the calculators people use most
Learn the reasoning
Guides that explain the numbers behind the calculators
Sizing a battery backup without guessing
Why a 100Ah lead-acid battery gives you far less than 100Ah, and the two formulas that fix it.
How many solar panels do you need?
Start from daily watt-hours and Philippine sun hours, then decide if you need batteries.
Where your bill actually goes
Cooling and refrigeration are most of it. Ten changes that work, in order of payoff.
Calculators
Every result comes with a plain-English explanation you can save
🔋 Battery Backup Calculator
How long your battery will power your appliances
Check the sticker on your battery — it's usually printed as "Ah".
This changes how much of the battery you can safely drain.
Everything running at the same time. Tap the button to pick from a list instead of adding it up yourself.
Covers inverter and wiring losses. 15% is a safe everyday estimate.
🔌 Battery Charging Calculator
How long a recharge takes, and the right charger size
Printed on the charger, usually like "12V 10A".
☀️ Solar Panel Calculator
Size an array and battery bank that covers your daily use
Wattage × hours used, added up for the whole day.
Most of the Philippines averages 4.5–5.5. Rainy season or shaded roofs: 3–4.
How many cloudy days the battery alone should carry you through.
📈 Solar ROI Calculator
Payback period and long-term savings
Panels, inverter, battery, mounting and labour — everything you'll pay.
Meralco rates have historically risen a few percent a year. Set 0 to ignore.
Power you don't use or store is wasted unless you're on net metering.
⚡ Inverter Size Calculator
A safe inverter size with startup headroom
Everything running at once — lights, fans, laptop, router.
Motors briefly draw 2–3× their normal power the moment they switch on.
⚙️ Generator Size Calculator
Match a generator to your household load
The single largest motor appliance — usually the ref, pump or aircon. Enter 0 if none.
💡 Electricity Bill Estimator
What your appliances really cost each month
Divide your bill total by the kWh used to get your real all-in rate.
🧰 Cable Size Calculator
A safe copper cable size for your run length
Distance from source to appliance. The calculator already accounts for the return wire.
🛡️ Fuse & Breaker Size Calculator
The right protection rating for your circuit
Continuous circuits need more headroom so the fuse doesn't nuisance-trip.
🤖 AI Power Assistant
Ask anything about batteries, solar, inverters or generators
Your projects
Saved results, ready to export as one energy plan
📄 Energy plan report
Download it, print it, or bring it to a supplier
Profile
Your preferences and saved data
Your load profile and saved projects stay on this device.