Disclaimer: For estimation purposes only. Battery performance varies significantly with temperature, age, and discharge rate. Dr Darla accepts no responsibility for decisions based on these estimates. Consult a qualified power systems engineer for critical applications.
🔋 Battery Calculator

Battery Sizing & UPS Backup Calculator

Calculate battery bank capacity, number of batteries, backup time and estimated cost for UPS and solar energy storage.

Load details
Total load to be backed up500W
Required backup time2hours
~85–95% typical
Battery specifications
₹15–30/Ah for lead acid
Design margin (125% = 20% ageing)
Full breakdown
Energy required (Wh)
Load (W) × Backup time (hrs) ÷ Inverter efficiency
Usable capacity (Ah)
Energy required (Wh) ÷ System voltage (V)
Total Ah required
Usable Ah ÷ Depth of Discharge (DoD) × Ageing factor
Number of batteries in series
System voltage ÷ Battery voltage
Strings in parallel
Total Ah required ÷ Battery Ah rating
⚠ Temperature significantly affects battery capacity — derate by ~1% per °C below 25°C for lead acid. Always add safety margin for critical applications.
Tool by Dr Darla — Power Electronics & Energy Systems Expert · All Tools · drdarla.in

All calculations are estimates. Verify with qualified engineers before implementation.
← Back to All Tools

About | Contact | Tools | Privacy Policy | Terms