How do I calculate Battery Capacity & Autonomy?

To calculate Battery Capacity & Autonomy: Enter Load power, System voltage, Required autonomy and other values. Click Calculate. INDUGRID computes the result instantly using the formula: C_required = (I_load x t_auto) / DoD | Peukert: C_p = C20 x (I20/I)^(n-1). No registration required.

What units does the Battery Capacity & Autonomy calculator use?

The Battery Capacity & Autonomy calculator uses the following units: W, V DC, h, %. SI units are used by default.

Is the Battery Capacity & Autonomy calculator free?

Yes. The INDUGRID Battery Capacity & Autonomy calculator is completely free, requires no account or login, and works on desktop and mobile browsers.

Battery & DC Systems

Battery Capacity & Autonomy

Calculate required battery capacity for a given load and autonomy time, applying Peukert correction for high discharge rates.

Units:

in LinkedIn

💡Peukert's law: high discharge rates reduce effective capacity. A 100Ah battery at 20h rate delivers 100Ah, but at 1h rate may deliver only 55Ah. Lead-acid Peukert exponent n approx 1.1-1.3, Li-ion n approx 1.02-1.05.

C_required = (I_load x t_auto) / DoD | Peukert: C_p = C20 x (I20/I)^(n-1)

Input

Load power iTotal DC load power in Watts.

System voltage iDC system voltage: 12V, 24V, 48V or 110V DC.

V DC

Required autonomy iTime battery must support load without charging.

Max depth of discharge DoD iLead-acid: 50-80%, AGM: 80%, Li-ion: 80-90%.

Peukert exponent n iLead-acid/AGM: 1.1-1.3. LiFePO4: 1.02-1.05. Li-NMC: 1.03-1.08.

System efficiency iInverter + wiring efficiency. Typical: 85-95%.

Result

Load current [A] —

Basic capacity needed [Ah] —

Capacity with DoD [Ah] —

Capacity (Peukert corrected) [Ah] —

Energy stored [kWh] —