Battery Capacity Kwh
Calculator
Results
- Nominal capacity (Wh)
- 9,600
- Nominal capacity (kWh)
- 9.6
- Usable capacity (kWh)
- 7.68
Energy results
| Nominal capacity (Wh) | 9,600 |
| Nominal capacity (kWh) | 9.6 |
| Usable capacity (kWh) | 7.68 |
formula-map diagram
- Nominal capacity (Wh)
- 9,600
- Nominal capacity (kWh)
- 9.6
- Usable capacity (kWh)
- 7.68
Energy relationship
Formula
E(kWh) = V × Ah ÷ 1000; usable = E × DoD= 9600
Note
This is a simplified model: it applies the standard equation to the numbers you entered and ignores real-world losses, weather variation, tariff structures and equipment tolerances. Wind power assumes air density 1.225 kg/m³ at ISA sea level and the power coefficient you enter (Betz limit 0.593). Verify with measured data or a professional energy audit before making purchasing decisions.
More in Energy and environment
See all →Frequently asked questions
What's the difference between amp-hours and kilowatt-hours?+
Amp-hours (Ah) measure electric charge capacity at a specific voltage, while kilowatt-hours measure total energy, which depends on both charge and voltage. To convert, multiply amp-hours by voltage and divide by 1000: kWh = (Ah × V) ÷ 1000.
Why is my usable capacity less than the rated capacity?+
Most batteries, especially lithium-ion, shouldn't be fully discharged to protect their lifespan, so manufacturers specify a depth of discharge limit, often 80-90% for lithium or 50% for lead-acid. Usable capacity is the rated capacity multiplied by that depth-of-discharge percentage.
Does battery capacity degrade over time?+
Yes, all rechargeable batteries lose capacity with charge cycles and age, typically retaining 70-80% of original capacity after several thousand cycles depending on chemistry and usage patterns. A capacity calculation based on nameplate specs represents a best-case, day-one figure.
How does temperature affect the kWh figure?+
Battery capacity drops in cold temperatures, sometimes by 20% or more at freezing conditions, because chemical reactions inside the cells slow down. The rated kWh is usually measured at room temperature, so real-world capacity can be noticeably lower in cold climates.
Why do voltage and capacity both matter for sizing a battery bank?+
Two battery banks can store the same energy in kWh with very different voltage and amp-hour combinations, and the right combination depends on your inverter or appliance's voltage requirements. Always size around the kWh figure but confirm the voltage matches your system.