Peukert's Law Calculator

Peukert's Law describes how a battery's effective capacity decreases as the discharge rate increases. It's crucial for accurately predicting battery runtime in real-world applications where discharge rates vary from the rated conditions.

Lead-acid batteries typically have Peukert numbers between 1.1-1.3, with higher values for older or lower-quality batteries. Lithium batteries perform better with Peukert numbers around 1.05-1.15, while AGM batteries fall in between at 1.15-1.25.

Higher discharge rates reduce effective battery capacity due to internal resistance and chemical reaction limitations. A battery rated at 100Ah at 5A discharge might only deliver 80Ah when discharged at 20A, depending on its Peukert number.

Yes, but you need the correct Peukert number for your specific battery type and model. The manufacturer's datasheet or battery testing can provide this value, as it varies significantly between different chemistries and designs.

Real-world factors like temperature, battery age, depth of discharge limits, and inverter efficiency can further reduce runtime. Peukert's Law accounts for discharge rate effects but doesn't include these additional factors.

You can estimate it by testing discharge times at different current levels, or use typical values: 1.3 for flooded lead-acid, 1.2 for AGM, 1.15 for gel, and 1.1 for lithium. Conservative estimates help ensure adequate battery sizing.

Temperature significantly affects battery performance, but Peukert's Law primarily addresses discharge rate effects. Cold temperatures increase the effective Peukert number, while warm temperatures decrease it, requiring separate temperature correction factors.

Absolutely. Using the manufacturer's rated capacity without Peukert correction often leads to undersized battery banks. Always calculate effective capacity at your actual discharge rates for proper system design and reliable operation.