Inverter Battery & Solar Calc

How long will your inverter battery last tonight? PowerBackup answers in seconds — and logs every power cut so you always know where you stand.

PowerBackup is an inverter calculator, battery backup time calculator, UPS sizing tool, solar panel calculator and power outage log in one simple app. Built for homes and shops that live with load shedding and frequent power cuts.

⚡ BATTERY BACKUP TIME CALCULATOR
• See how many hours your battery backup lasts at your real load
• Ideal runtime plus a realistic estimate (Peukert effect) for high loads
• Works with tubular, flat plate, SMF / AGM / gel and lithium (LiFePO4) batteries
• 12 V, 24 V and 48 V systems, one or many batteries
• Full recharge time after an outage

🔌 INVERTER & UPS SIZE CALCULATOR
• Find the right inverter VA rating for your appliances
• Battery size in Ah for 2, 4, 6, 8 or 10 hours of backup
• Compare tubular lead-acid vs lithium battery size
• DC current, battery cable size (mm²) and DC fuse rating
• Every step of the formula shown — no guesswork
• Share your inverter & battery plan as a PDF for your installer

💡 APPLIANCE LOAD CALCULATOR
• 24 ready presets: ceiling fan, LED bulb, fridge, AC, water pump, TV, Wi-Fi router, laptop and more
• Quantity, hours per day and motor start-up surge
• Choose which appliances run on backup and see total watts instantly
• Check if your load fits your inverter before you overload it

☀️ SOLAR PANEL CALCULATOR
• Number of solar panels and system size in kWp
• MPPT charge controller size and system voltage
• Roof area needed and daily solar generation
• Plan for battery charging only, daytime loads, or your whole day
• Monthly units saved and savings at your electricity tariff
• Hybrid, off-grid and on-grid notes

📒 POWER OUTAGE LOG
• One tap to log a power cut with a live timer
• Backup countdown: see how much battery time is left
• Mark scheduled vs unscheduled outages and add notes
• See which outages your backup covered and which ran out

📊 OUTAGE INSIGHTS & REPORTS
• Total hours without electricity, average and longest outage
• Daily outage chart and the hours when power cuts happen most
• Battery advice based on your real outages
• Export an outage report PDF or CSV to share with your electricity company, landlord or society

⏰ LOAD SHEDDING SCHEDULE & REMINDERS
• Save your area’s weekly load shedding schedule
• Get a reminder before each power cut to charge phones and fill water
• Warning when a cut is longer than your backup time

🔋 BATTERY HEALTH & MAINTENANCE
• Estimated battery health from age and logged cycles
• Record a timed backup test for a measured value
• Reminders for distilled water top-up, equalizing charge and terminal cleaning

📘 INVERTER & BATTERY BUYING GUIDE
• Tubular vs lithium, inverter vs UPS, pure sine vs modified sine
• What VA, Ah and system voltage really mean
• A checklist before you buy

WHY POWERBACKUP?
✔ Inverter, battery, solar and outage tracking in one app
✔ Works offline — your data stays on your phone
✔ No sign-up or account needed
✔ Clear results with the formula behind them

Whether you are buying a new inverter, adding a second battery, planning solar panels or tired of guessing when the lights will go out, PowerBackup helps you plan your backup and beat the outage.

Note: results are estimates. Battery age, temperature, wiring and inverter efficiency affect real performance. Have a qualified electrician install your system.