Low Voltage Disconnect

Instructions in English:🔘 Button FunctionsUP ButtonShort press: Switch between percentage display and time.Long press (5 seconds): Toggle between charging mode (IN) and discharging mode (OUT).SET ButtonShort press: View current parameter settings.Long press: Enter parameter setting mode.Set the following:UP: Upper voltage limitdn: Lower voltage limitOP: Conduction timedOP: Delay conduction time (0–999 seconds)FOP: Forced conduction time (discharge mode only, 0–10 seconds)DOWN ButtonShort press: Toggle relay on/off (emergency stop). When disabled, the LCD displays “OFF” and the relay is disconnected.Long press: Set LCD backlight mode:L-P: Backlight always onON: Backlight auto-off after 5–10 minutes (press any key to wake it up)🔋 Mode DescriptionsCharging Mode (IN)When battery voltage ≤ dn (lower limit), the relay turns on and charging begins.When battery voltage ≥ UP (upper limit), the relay turns off, ending the charge.While charging, the relay is on and "IN" flashes.Discharging Mode (OUT)When battery voltage ≥ UP, the relay turns on and discharging begins.When battery voltage ≤ dn, the relay turns off, ending the discharge.While discharging, the relay is on and "OUT" flashes.⚠️ Note: This device is a simple voltage controller. It uses a relay to switch output on or off. It does not regulate voltage or current—only on/off switching.⚙️ Parameter SettingsEnter Setting Mode: Long press the SET button.Navigate Parameters: Press SET to switch between parameters.Adjust Values: Use UP or DOWN to set values (short and long presses supported).Save & Exit: Long press SET again.3.1 ⏱ Charge/Discharge Time ControlIf OP (conduction time) ≠ 0:Timing begins when the relay activates.Once OP time is reached, relay disconnects automatically.If voltage conditions are invalid during timing (< dn in charge mode or > UP in discharge), the device displays H:ER to signal a configuration error.Press any button to stop flashing.If time control is off (OP = 0), the total charge/discharge duration is still recorded and shown during time display mode. This resets upon exit or the next cycle start.3.2 ⚠️ Auto Parameter CheckIf dn ≥ UP, the device will display ERR and not operate.3.3 ⏲ Delay Function (dOP)Delay time between a completed cycle and the next relay activation (0–999 seconds).3.4 🔄 Forced Relay Conduction (FOP)In discharge mode, when conditions are met, the relay forces ON for 0–10 seconds, allowing for voltage re-checking.Useful when test loads cause a false low-voltage reading at the start of discharge.

Simple device that will disable battery discharge at any settable voltage point, or be used as what it was designed to do, monitor battery drain and automatically charge to a set point. Works great and has features to set timing of active charge and discharge resets

I saw some other reviews saying that this switch didn't work. It definitely isn't plug and play. It took me a minute to figure it out. Which can be difficult since the users manual is written in broken english.My issue was that as I was using it to protect the over discharge of my batteries was that I assumed the upper voltage limit was supposed to be above my supplied voltage. That won't trigger the relay to supply power. The upper limit needs to be set below supplied voltage. And the actual lower voltage limit.... I'm not sure what that does yet.It should be noted that I'm not familiar with these types of electronics.

Really works good saved a battery

Ruined a battery because it way undercharged it. Not sure if I programmed correctly though

Burned up after several months

Way better than the cheap ones

Product seems to work well but is hard to mount. The wire lugs should be bigger and mounted better. They twist a lot when tightening the screws.Update,After 1 day the device no longer is switching on. Programming works, display is working but no power is being sent. I will be returning this and looking for a different solution.