This Electrical Power & Battery Calculator helps you calculate watts, volts, amps, amp-hours, watt-hours, kWh, VA, and kVA. Choose the calculation you need, enter the known values, and get the result instantly. It is useful for batteries, solar systems, inverters, electrical appliances, and power calculations.
Electrical Power Calculator Examples
| Calculation | Example Input | Result |
|---|---|---|
| Watts, Volts & Amps | 120 V × 10 A | 1,200 W |
| kWh to Ah | 2 kWh at 48 V | 41.67 Ah |
| Ah to kWh | 100 Ah at 48 V | 4.8 kWh |
| kWh to Watts | 2 kWh over 5 hours | 400 W |
| VA to Amps | 1,200 VA at 120 V | 10 A |
| Amps to kVA | 20 A at 240 V | 4.8 kVA |
| Battery Capacity | 10 A × 8 hours | 80 Ah |
| kVA to Amps | 5 kVA at 240 V | 20.83 A |
| Ah to Wh | 100 Ah at 12 V | 1,200 Wh |
| Amps to Watts | 10 A at 120 V | 1,200 W |
| mAh to mWh | 5,000 mAh at 3.7 V | 18,500 mWh |
Note: These examples use ideal/basic electrical formulas. Actual battery capacity, inverter output, and AC-system calculations can vary because of efficiency, power factor, wiring losses, and other real-world factors.
FAQs
What can this electrical power calculator calculate?
It can calculate watts, volts, amps, amp-hours, watt-hours, kWh, VA, kVA, mAh, and mWh using the appropriate electrical formulas.
How do I convert kWh to Ah?
You need both the energy in kWh and the voltage. The basic formula is Ah = (kWh × 1,000) ÷ Volts.
How do I convert Ah to kWh?
Multiply amp-hours by voltage and divide by 1,000: kWh = (Ah × Volts) ÷ 1,000.
How do I calculate watts from amps and volts?
For a basic DC calculation, multiply amps by volts: Watts = Amps × Volts.
How do I calculate battery capacity in Ah?
If you know the current and operating time, multiply them: Ah = Amps × Hours.
Is kVA the same as kW?
No. kVA measures apparent power, while kW measures real power. In AC systems, the relationship depends on the power factor.
Can I use this calculator for batteries and solar systems?
Yes. It can be used for basic battery, solar, inverter, and electrical power calculations. Real systems may have efficiency losses and other factors that aren’t included in the basic formulas.
Does the calculator account for battery efficiency or inverter losses?
No. The calculations are based on ideal/basic formulas. For real-world system sizing, efficiency, power factor, temperature, battery characteristics, and other system losses may need to be considered.
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