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Cake day: January 21st, 2026

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  • Whether current is flowing into an appliance or into the grid depends on which of the two has the highest voltage at any given time. Current is the result of a voltage difference in a closed loop.

    These batteries have a built-in inverter. The inverter can produce an output voltage. The electricity grid uses AC which means the voltage is not constant but rather always changing in a sine pattern. To control the current, the inverter can follow the sine pattern and increase amplitude to control an outgoing current, or decrease it to control an incoming current.

    By the way, in many cases you don’t want to power the grid. So these batteries usually work together with a sensor placed at your electricity meter. That way they can induce just the right amount of current to power your home appliances without sending something back to the grid.