How much energy does a home battery lose?
Charging and discharging always loses part of the electricity, and the battery and inverter also use power when they are doing nothing (standby). Both take away part of the yield.
The efficiency over a full cycle, charging and discharging again, is often in the manufacturer's specifications (round-trip efficiency). What does not come out is lost as heat. With a battery connected on the AC side, the electricity also passes through an inverter.
Standby
A battery with inverter and controller uses a small amount of power all day, even when it is empty or full. Over a year that adds up, especially in winter, when the battery has little to do.
Why it matters
Losses and standby make every shifted kWh more expensive. A battery that earns little per kWh, for example with a small price difference, therefore yields little net. As long as net metering applies, a battery even costs a little.
In the calculator
The calculator includes losses and standby every hour. You can adjust them for the battery to what the manufacturer states; the default values are on How does this calculator work?
Calculate what a battery yields after losses
An estimate, not personal advice. How the calculator works: How does this calculator work?
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