Battery Sizing Calculators for UPS, Inverter & Solar Systems

CircuitSecrets

Professional Electrical Engineering Tools

Battery Calculators Phase-1

Core battery calculations for UPS systems, Inverters, Solar battery banks, and DC backup systems based on IEEE / IEC engineering logic.

Battery Capacity Calculator

Determine the total required battery capacity (Ah) for a given load and backup time.

Load Power (W)

Backup Time (Hours)

System Voltage (V) 12V 24V 48V 96V

Battery Type Lead-Acid Lithium-Ion

Depth of Discharge (%)

Inverter Eff. (%)

Engineering Results

Required Battery Capacity

-- Ah

Required Energy

-- Wh

Awaiting Calculation

Battery Backup Time Calculator

Calculate how long your existing battery bank will last under a specific continuous load.

Battery Capacity (Ah)

Battery Voltage (V)

Continuous Load Power (W)

Depth of Discharge (%)

Efficiency (%)

Engineering Results

Estimated Backup Time

-- hrs -- mins

Discharge Current

-- A

Awaiting calculation to determine operating limits.

Battery Bank Calculator

Determine the number of batteries required in series and parallel to build a target system.

Single Battery Specs

Voltage (V)

Capacity (Ah)

Required Target Specs

Target Voltage (V)

Target Capacity (Ah)

Bank Configuration

In Series

-

to increase Voltage

In Parallel

-

to increase Capacity

Total Batteries Required: -

Final Bank Spec: - V / - Ah

Configuration rules apply equal strings.

Battery Charging Time Calculator

Estimate the time required to recharge a depleted battery array.

Battery Capacity (Ah)

Charger Current (A)

Battery Type Lead-Acid Lithium-Ion

Charging Eff. (%)

Engineering Results

Estimated Charge Time

-- hours

Recommended Charger Current

--

Awaiting calculation.

ENGINEERING DISCLAIMER: This calculator is for estimation purposes only. Real-world results may vary based on temperature, battery age, Peukert's law, and wiring losses. Always verify with manufacturer data sheets and consult local electrical codes before designing or installing systems.