The relay does not function; it only displays the current voltage.
When the battery is low, the relay closes to allow the charger to work. When full, it opens to prevent overcharging. Xh-m608 Manual
Sets the trigger for stopping a charge or starting a discharge. The relay does not function; it only displays
Relay closes when voltage ≤ P1 (lower limit) and opens when voltage ≥ P2 (upper limit). The relay does not function