Power is how much at once
Inverter power, measured in kilowatts (kW), helps determine which electrical loads can operate simultaneously. Check continuous demand and appliance start-up requirements.
Capacity is stored energy
Battery energy, measured in kilowatt-hours (kWh), helps determine operating duration. As a simple ideal example, 10 kWh divided by a constant 1 kW load equals 10 hours. Real runtime is lower or different because usable capacity, conversion losses, settings and changing loads matter.
Choose around your household
List the appliances that must run together and decide how long essential loads need support. Confirm phase, backup circuit design and equipment compatibility. More battery capacity does not automatically increase inverter output power.