Battery Sizing Calculator
How big a battery do you actually need? Enter your total load in watts and the backup hours you want, pick your system voltage and battery type, and get the required Ah plus how many standard batteries that means — instantly.
Required Capacity
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200Ah Batteries
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100Ah Batteries
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Note: connecting batteries in series increases voltage, connecting in parallel increases Ah. Match the combination to your inverter's voltage.
How to use
- Enter your total load (W) and how many hours of backup you need.
- Select the system voltage and battery type — DoD (depth of discharge) is applied automatically.
- The required Ah and the number of 200Ah / 100Ah batteries appear instantly.
Tips
- Size from your actual measured load, not the sum of nameplates — not everything runs at once.
- Lithium batteries allow deeper discharge than lead-acid, so you need fewer of them.
- Add a 15–20% safety margin for ageing and cloudy days.
- DoD (depth of discharge) is applied automatically when you pick a battery type.
Formula: Required Ah = (Load × Hours) ÷ (Voltage × DoD × Efficiency). For battery sizing or solar installation: Azlaan Electric AC Solar Center, Faisalabad — 0300-8987448.