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SYSTEM SIZING

5kW Inverter with 10.24kWh, 15.36kWh and 20.48kWh Batteries

Inverter power and battery energy answer different questions. A 5kW rating describes power capability; battery kWh describes nominal stored energy.

UPDATED
01

5kW is a power rating, not a runtime promise

02

10.24, 15.36 and 20.48kWh are nominal energy options

03

Runtime requires an actual load profile and system limits

Separate kW from kWh

Power identifies how much load can be served at a moment; energy helps estimate how long loads can run.

  • Record continuous and surge loads separately.
  • Build an hourly energy profile instead of assuming the inverter operates at 5kW continuously.

Compare the three energy levels

Use nominal values as comparison points, then apply the actual system limits.

  • 10.24kWh suits a lower energy target than 15.36 or 20.48kWh.
  • More nominal energy usually requires more installation space, weight allowance and charging time.

Confirm system compatibility

The selected battery must operate within the inverter and project boundaries.

  • Confirm voltage window, current limits, communication and protection behavior.
  • Review charging power, solar input, grid conditions and desired recharge time.

BUYER QUESTIONS

Buyer questions

Does a 5kW inverter need a 5kWh battery?

There is no one-to-one rule. Power and energy are different; size the battery from the load profile, runtime and system limits.

Which capacity gives the longest backup?

Under the same load and system limits, the higher nominal energy option offers more energy, but actual runtime still requires a full system calculation.

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