Electrical & Energy

Battery Runtime Calculator

Estimate battery runtime from capacity, voltage, load and efficiency.

Electrical & EnergyFree calculatorClear units & parameters

Calculator

Enter the values below. Every quantity identifies its unit or meaning.

Battery capacityUnit: Ah

Battery voltageUnit: V

Load powerUnit: W

System efficiencyUnit: %

Formula / methodRuntime = capacity × voltage × efficiency ÷ load.

Result

Calculated from your inputs.

Primary result

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—Primary input

—Secondary input

Reference note: Electrical results are planning/reference estimates. Follow applicable electrical codes, equipment ratings and qualified professional guidance for installations.

Electrical & Energy reference calculator

These results are for general calculation and planning. Actual electrical installations, conductor sizing, protection settings, solar systems, batteries and generators should be designed and verified against applicable codes, manufacturer specifications and site conditions.

How to use this calculator

What to enter

Enter or select the following as requested: Battery capacity; Battery voltage; Load power; System efficiency. Follow the units, valid ranges, examples, and options displayed beside each field.

What the result means

The electrical or energy result is based on the ratings, load, duration, voltage, efficiency, and other values requested by the form. Confirm units and design assumptions; real performance depends on losses, environmental conditions, and equipment specifications.

When to use it

Use this for preliminary energy estimates or equipment planning. For electrical installation, safety, or code compliance, verify the result against manufacturer data and applicable professional standards.