Battery Sizing Calculator

Calculate battery capacity for your power needs. ⚠️ Educational tool only — always consult professionals.

⚡ Enter Your Power Requirements:

Load Power (W)

Watts

System Voltage (V)

Volts

Desired Runtime (hours)

Hours

System Efficiency (%)

Add 20% Safety Margin

Accounts for battery aging, temperature, and discharge limits

Quick Examples:

⚠️ Important Battery Safety & Facts

Formula: Ah = (W × h) / (V × Efficiency)

Amp-hours = (Watts × Hours) ÷ (Volts × Efficiency)

⚠️ Critical Safety

• Always consult qualified electricians
• Follow manufacturer datasheets
• Comply with local electrical codes

Battery Types

• Lead-acid: Cheap, heavy, 50% DoD
• Lithium: Light, expensive, 80% DoD
• Deep-cycle: Best for long runtime

Pro Tips

• Add 20-30% safety margin
• Consider temperature effects
• Factor in battery aging
• Include inverter losses

Disclaimer:

This tool provides educational estimates only. Actual battery sizing requires professional engineering review. Always verify with manufacturer specifications and local regulations.

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