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Reviewed in the United States on September 15, 2024
These modules work. No instructions are included, but the instructions can be found on the Amazon sale site. It does take a few tries to set up the modules and understand the instructions, but the modules work. They even remember your settings if powered Off and then repowered.
Customer Review
Reviewed in the United States on September 15, 2024
A little fiddly to configure but that's a one time hassle. Neat and works perfectly. The LED display is bright and clear... but that does mean it uses more power than ideal.A very convenient solution!
SaltyFish
Reviewed in the United States on August 25, 2024
Ordered this low voltage cutoff to control my battery bank and inverter to avoid draining my battery to 0%. so far, it works just as like it should. no major complaint on quality. Only issue I have is max current is a bit low for what I need. I wish it handle higher max current like 50A. overall, it works great for small project.
E=Itimesar
Reviewed in the United States on August 22, 2024
I plan to use this on a LiFePO4 I use as a portable power source. It was easy to set the low cut-off voltage and "differential" (the voltage that the relay cuts back on at after cutting off at low cut-off).In use:1) I adjusted the voltage display by holding the + button for a few seconds, then adjusting the display to match a multimeter.2) I set the cut-off voltage to 12.0V (for 3.0V per cell, 10%), and the differential to 1.0 (12.0V+1V = 13.0V for 3.25V per cell, 40%)3) When first plugged in, the voltage has to be at 13V or greater to turn on the load.4) When the voltage decreases to 12V, the relay turns off and disconnects the load.5) When charging brings the battery voltage back to 13V, the relay turns back on.6) I can easily adjust the voltage to fit my battery's performance if I need to later.Pros- digital voltage display that you can set to account for component drift- LED to indicate when the relay/load is on- easy to setup- screw terminals make it easy to connectCons- none found
TECHnical
Reviewed in the United States on August 19, 2024
I'm using these protectors to protect 12V batteries powering things like lights and inverters. They seem like a great investment to avoid over-discharging and degrading batteries. I like that they allow full control over parameters and even voltage calibration. Setting parameters wasn't too hard once I carefully read instructions in listing, though buttons sometimes double-pressed.Testing operation, they worked reliably for full 36V range. Disconnects when battery drops to disconnect voltage, then reconnects when it rises to disconnect+offset voltage. Voltage display was within 0.1V except above 24V, but after calibration it was within 0.1V for entire range. Power draw at 12V was ~1.0W when on, 0.32W when off, so you wouldn't want to leave this connected all the time.Trick to fully disconnect from battery on low voltage (see photo): connect battery to OUTPUT terminals, and add momentary switch between + in and + out (must handle full load current). This will power it long enough for relay to latch and operate normally. Then when battery gets low, relay will disconnect load AND voltage monitoring so it doesn't draw any current after disconnected.
kluj
Reviewed in the United States on August 18, 2024
A neat cutoff both for battery overdischarge protection as well as secondary solar installs where panels are connected to devices which behave erratically at lower-than-expected voltage. My use case is the latter. Instead of setting the trigger voltage directly, you instead set an offset to the measured voltage (e.g. if true read is 12v, you set to 11v for a -1v offset, meaning it will now trigger at 13v [instead of 14v] and shut off at 11v [instead of 12v]). Hold the button nearest to the inductor for ~3 seconds, let go, and then use the buttons to adjust the offset up or down.The hysteresis (setting the gap between turn-on and shut-off) is set similarly; hold the button furthest from inductor for ~3 seconds and adjust up and down with the buttons. I didn't see instructions included in the package, so I am glad it only has two buttons! I will note, too, the recessed screws in the terminal blocks use flathead sockets for whatever reason.The board includes an SS34 (3A) schottky for backflow protection which may or may not be sufficient for what you're doing, but the board's laid out in a very clean way if you'd like to swap it and're handy with an iron.The board draws somewhere around 0.2W while relay's disengaged, and around 1W while relay's engaged. Draw changes slightly based on input voltage.
Vidalia
Reviewed in the United States on October 5, 2024
The PowMr Low Voltage Cutoff is a protective module for 12-36V systems, designed to prevent battery over-discharge by automatically disconnecting at preset levels. It features flexible settings, and a relay to control output. The compact device is ideal for automotive, solar, and other power systems, providing efficient power management and extending battery life.
David S.
Reviewed in the United States on October 21, 2024
I installed this PowMr Low Voltage Cutoff (LVC) in my greenhouse’s solar battery pack setup, and it’s been working flawlessly. I’ve connected it to a relay that controls a lithium battery charger, and it automatically cycles the charger on and off based on the voltage settings I configured. The setup was fairly straightforward, and the module has performed exactly as expected for the past two months.This LVC has been a great addition to my solar system, especially as winter approaches with shorter daylight hours. It ensures my batteries stay protected and maintain proper voltage levels, even when solar charging is limited due to weather. It gives me peace of mind knowing my batteries are being managed efficiently and not over-discharged, which is crucial for extending their lifespan.If you’re running a solar setup and need a dependable solution for voltage control, this module is an excellent choice. It’s simple to set up and provides reliable performance, making it a valuable tool for maintaining battery health in varied weather conditions.
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