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What is ‘usable kWh’?

Usable kilowatt-hours (kWh) in relation to solar batteries refers to the amount of energy that can actually be drawn from the battery to power your home or appliances. It can be different from the total or nominal capacity of the battery, which is the full amount of energy the battery can technically hold and is sometimes what is advertised by the manufacturer. Usable kWh should always be disclosed on the product datasheet.