One of the limitations of conventional relays is that when the batteries are coupled (the relay is in the closed position), it has a consumption of 0.45A (for an 80A model), this is negligible when the charging source is an alternator or a charger as they produce a significant amount of electricity.
The bistable relay is based on another operating mode, the relay is placed either in the open or closed position, and whatever the position, the consumption remains low. The Sterling bistable relay consumes 0.5mA or 1000 times less than a conventional relay.
Thanks to its very low power consumption, it can be used for other applications such as:
Recharging a secondary battery park when the power source is a wind turbine or solar panels.
Protection of the batteries against deep discharges (the circuit is switched off as soon as the battery drops below a certain voltage threshold).