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12V Battery Charging Controller Protection Board Module Undervoltage Low Voltage Cut Off Automatic Switch Recovery Protection Controller Module with A LED Indicator

4.0 4.0 out of 5 stars 88 ratings
$6.40
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Purchase options and add-ons

Brand Walfront
Color Blue
Item Weight 0.02 Kilograms
Input Voltage 12 Volts
Output Voltage 12 Volts

About this item

  • This is a under-voltage switch module used to turn off the power of load in the event of the voltage dropping below a set value
  • When the battery voltage increases to a set value, the module will automatically turn on load again
  • Designed with a LED indicator to show if load is cut off or turned on
  • Both turn-off and turn-on voltage value can be adjusted by simply adjusting potentiometer
  • This protection board will help you to protect battery from over-discharging and prolong battery life

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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Item model number ‏ : ‎ Walfront3cg59ad78m
  • Date First Available ‏ : ‎ February 28, 2018
  • Manufacturer ‏ : ‎ Walfront
  • ASIN ‏ : ‎ B07B49T4DQ
  • Customer Reviews:
    4.0 4.0 out of 5 stars 88 ratings

Product Description

  • Specifications:
  • Suitable Battery Voltage: 12V
  • Voltage Error: ±0.1V
  • Load Current: 10A
  • Size: 5*3*1.7cm/2.0*1.2*0.7in
  • Weight: 21g(approx.)
  • Package Includes:
  • 1 x Protection Board

12v low voltage cut off
Battery Charging Protection Board

Board Instruction:

When the battery voltage increases to a set value, the module will automatically turn on load again.

Battery Charging Protection Board

Potentiometer Adjustment Instruction:

Both turn-off and turn-on voltage value can be adjusted by simply adjusting potentiometer.

cutoff switch 12v low voltage

Small Size for Convenient Operation

The size of the Battery Protction Board is 5*3*1.7cm/2.0*1.2*0.7in, which offers convenient operation and carriage.

12 volt low voltage cutoff switch

12v low voltage cut off

12v low voltage cut off Battery Charging Protection Board

Conveniently:

This is a under-voltage switch module used to turn off the power of load in the event of the voltage dropping below a set value.

Automatically:

When the battery voltage increases to a set value, the module will automatically turn on load again.

Longer Lasting:

This protection board will help you to protect battery from over-discharging and prolong battery life

Looking for specific info?

Customer reviews

4 out of 5 stars
4 out of 5
88 global ratings

Customers say

Customers like the performance of the power converter, saying it works well and is great for low battery detection. They also say it shuts down before the battery dies. However, some customers report issues with the adjustability, saying the converter does not come adjusted to any reasonable threshold levels and needs special tuning. Opinions are mixed on ease of use.

AI-generated from the text of customer reviews

4 customers mention4 positive0 negative

Customers are satisfied with the performance of the power converter. They mention that it works well, is adjustable, and is great for low battery detection and shutting down before the battery dies.

"...this on a battery backed 220 repeater/remote base and it works great to shut it down before the battery dies completely...." Read more

"...They all work just fine. Be aware that they do not come adjusted to any reasonable threshold levels...." Read more

"Overall works well I just wish the instructions were more clear. That’s what it says it would do." Read more

"Very adjustable and works well." Read more

6 customers mention3 positive3 negative

Customers are mixed about the ease of use of the power converter. Some mention it's easy to use and simple, while others say the instructions are unclear and it requires special tools to do special tuning.

"This unit is small and easy to use. keeps batteries and you safe for a great price. Stick it on top of the battery and hook it up...." Read more

"No instructions with this unit - it's just the board, in a static bag. The terminals are labeled on the PCB, but the pots aren't...." Read more

"Very simple, great way to control loads on a solar install..." Read more

"...] Overall works well I just wish the instructions were more clear. That’s what it says it would do." Read more

3 customers mention0 positive3 negative

Customers are dissatisfied with the adjustability of the power converter. They mention that it does not come adjusted to any reasonable threshold levels, and that it needs special tuning and special tools to do so.

"...They all work just fine. Be aware that they do not come adjusted to any reasonable threshold levels...." Read more

"Product did not work at all it would not adjust to set the voltage and for $16 it's not even worth it I found better items for way cheaper with..." Read more

"Needs special tuning, requires special tools to do so..." Read more

Responds too fast to the cut-off voltage value
4 Stars
Responds too fast to the cut-off voltage value
This is my second Protection Board Module, it work ok but to set it correctly you got to have a variable voltage supply to set the cut-off voltage and the reconnect voltage. 2 things I love about this is that there is no display to drain the power and a by-pass switch can be connected to switch it on manually instead for having to wait for it to reach the reconnect voltage.What I don't like about this is that there is no delay when it reaches it cut-off voltage. When I connect a device there is a quick sudden drop in voltage for a split moment before it go back to normal, it cuts off quickly in that sudden drop, for example, the Protection Board Module is set to switch off at 11.7 volts while the supply voltage is 12.6 volts, I switch on an inverter and the voltages drops to 11.6 for half a second and goes back to 12.6 volts before the average voltmeter can read it. This Protection Board Module seems as though it disconnected prematurely. It works as it should but there should be a delay for a second or 2 just in case the set cut-off voltage is temporary.
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Top reviews from the United States

Steve - WB4BXO
5.0 out of 5 stars Works great for low battery detection
Reviewed in the United States on August 6, 2021
Verified Purchase
I use this on a battery backed 220 repeater/remote base and it works great to shut it down before the battery dies completely. Just remember you need to make a way for the charging current to get around this for it to charge the battery and activate again.
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RadioRandy
4.0 out of 5 stars Works as stated
Reviewed in the United States on February 29, 2024
Verified Purchase
Bought 7 of them to protect the back up battery in remote devices. They all work just fine. Be aware that they do not come adjusted to any reasonable threshold levels. 5 of them you had to have a battery voltage of over 15 volts before they would turn on. DO NOT EXPECT THESE TO BE PLUG AND PLAY! I used a variable power supply and a good Fluke meter to set them to my liking. I don't see how you would adjust them any other way.
One person found this helpful
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nitramjm3
5.0 out of 5 stars Very simple, great way to control loads on a solar install
Reviewed in the United States on December 29, 2018
Verified Purchase
You must add some non-conductive standoffs and mount on something. Works as advertised. It's a great deal for off grid solar where you want to run something (fridge or dehumidifier) while you are away, but do not want to drain the battery. All the entry level inverters I've worked with stop sourcing AC when the battery gets down to 10.5V. Way to low... kills the battery. So with this, you can set the voltage to what you want.. in my case 12V, or about 50% charge. Feed the output to a DC controlled AC relay (switch shuts off AC power if the DC voltage goes away).
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Brian E Beaty
1.0 out of 5 stars No idea what I'm doing
Reviewed in the United States on October 29, 2018
Verified Purchase
No instructions with this unit - it's just the board, in a static bag. The terminals are labeled on the PCB, but the pots aren't. Q&A here at Amazon state the startup switch is "mandatory", but that the unit should turn back on when voltage rises above a threshold.

Haven't played with the pots yet - have it hooked up to a solar fountain with a small battery bank. Unit won't turn on unless I hit the "Mandatory switch". Unit then runs until it hits low voltage threshold though. I'm wondering if I can adjust one of the pots to get it to turn on without the switch - that was the impression I was given when I bought it... if I have to hit the button every time to start it, then it isn't terribly useful.

Would be really nice if the pots where labeled at the least. Even better would have been a small bit of documentation. But I guess you get what you pay for.

*Edit*
The PCB is marked for the pots. While trying to adjust - unit sparked, won't turn off (always on when battery voltage is applied), but no voltage out output terminals. Lasted a grand total of 36 hours, never was able to get it working right.
4 people found this helpful
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Cosmos Joseph
4.0 out of 5 stars Responds too fast to the cut-off voltage value
Reviewed in the United States on June 30, 2021
Verified Purchase
This is my second Protection Board Module, it work ok but to set it correctly you got to have a variable voltage supply to set the cut-off voltage and the reconnect voltage. 2 things I love about this is that there is no display to drain the power and a by-pass switch can be connected to switch it on manually instead for having to wait for it to reach the reconnect voltage.

What I don't like about this is that there is no delay when it reaches it cut-off voltage. When I connect a device there is a quick sudden drop in voltage for a split moment before it go back to normal, it cuts off quickly in that sudden drop, for example, the Protection Board Module is set to switch off at 11.7 volts while the supply voltage is 12.6 volts, I switch on an inverter and the voltages drops to 11.6 for half a second and goes back to 12.6 volts before the average voltmeter can read it. This Protection Board Module seems as though it disconnected prematurely. It works as it should but there should be a delay for a second or 2 just in case the set cut-off voltage is temporary.
Customer image
Cosmos Joseph
4.0 out of 5 stars Responds too fast to the cut-off voltage value
Reviewed in the United States on June 30, 2021
This is my second Protection Board Module, it work ok but to set it correctly you got to have a variable voltage supply to set the cut-off voltage and the reconnect voltage. 2 things I love about this is that there is no display to drain the power and a by-pass switch can be connected to switch it on manually instead for having to wait for it to reach the reconnect voltage.

What I don't like about this is that there is no delay when it reaches it cut-off voltage. When I connect a device there is a quick sudden drop in voltage for a split moment before it go back to normal, it cuts off quickly in that sudden drop, for example, the Protection Board Module is set to switch off at 11.7 volts while the supply voltage is 12.6 volts, I switch on an inverter and the voltages drops to 11.6 for half a second and goes back to 12.6 volts before the average voltmeter can read it. This Protection Board Module seems as though it disconnected prematurely. It works as it should but there should be a delay for a second or 2 just in case the set cut-off voltage is temporary.
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Customer image
Customer image
2 people found this helpful
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Shawn M Hiniker
5.0 out of 5 stars While I like seeing the voltage I'm planning to put the is ...
Reviewed in the United States on June 20, 2018
Verified Purchase
I'm using this in my vehicle to disconnect power to my fridge while camping if the battery voltage drops too low. I went with this unit instead of others on Amazon for a few reasons.
1) The disconnect and reconnect voltages are adjusted by the two potentiometers on the board. Most others have dip switches that force you to use a set of predetermined disconnect and reconnect voltages. Others had no adjustment at all.
2) No voltage display. While I like seeing the voltage I'm planning to put this unit behind my lower kick panel where my wires from the fridge come into the fuse box. So no real reason for the display. That and that display uses more power which will create a larger drain on the battery when the engine is off for no real reason.
3) This unit has an override capability. If you connect the two pins on the board inside the white connector it will override the disconnect/reconnect logic and connect the load. Could be useful for some. I haven't decided if I will use it or not since I don't see a situation where I would want to continue depleting the battery below my disconnect voltage. The type of connector needed is in one of the description photos. I ended up ordering one from digikey.

Next step is to protect the circuit board from grounding out on anything behind the kick panel. I'm debating getting a small plastic enclosure, but I haven't found any that seem like a good fit. The unit is actually very compact. I may just spray a heavy urethane coating on it, and call it good.
12 people found this helpful
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GEORGE
5.0 out of 5 stars Inverter saver
Reviewed in the United States on August 26, 2022
Verified Purchase
Appears to be just what I need to prevent my inverter from frying due to low voltage. I haven't yet used it in real life, since all of my inverters are damaged due to low battery voltage. I am trying to supply solar panel power for my pond, but overcast skies drain the battery and it can't recover. So, low battery voltage and then inverter is destroyed. Inverters say that they will cut out if input gets too low. True They will die!
One person found this helpful
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Top reviews from other countries

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Stan Wetmore
5.0 out of 5 stars Works Great for the price
Reviewed in Canada on December 23, 2023
Verified Purchase
I found it very easy to set up and it worked repeatedly. I used a variable power supply and a voltmeter. The multiturn pots made small voltage adjustments very easy. I will buy this item again.
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SONIA
5.0 out of 5 stars Muy buen producto
Reviewed in Mexico on October 2, 2023
Verified Purchase
Trabaja exactamente como lo esperaba. Lo puedes calibrar con una fuente variable o a prueba y error. Es más sencillo de lo que pensé. Si lo recomiendo para controlar carga y descarga de la bateri
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Fernand
4.0 out of 5 stars Fonctionne bien une fois ajusté
Reviewed in Canada on July 18, 2023
Verified Purchase
Contrairement à la description, les potentiomètres pour régler les voltages min et max n'étaient pas ajustés.
Un fois ajustés (voltage ON autour de 13V, voltage OFF autour de 10V) le relais fonctionne très bien.
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Jacquot Lachance
5.0 out of 5 stars Good produit
Reviewed in Canada on January 10, 2023
Verified Purchase
Good pour le prix
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Scott
3.0 out of 5 stars Works, but has issues with more than one amp load.
Reviewed in Canada on September 5, 2021
Verified Purchase
This relay is designed to take up to 10amp (resistive). However I've used two of these, one on a 0.3 amp load (and it worked fine) The second would not operate correctly if the load that was connected went over one amp. The relay locks up and buzzes, and any load attached will get a fast on/off response which can damage equipment. I even tried giving a lower voltage range for it to work in, and it did not help. If it's in it's buzzing state and you disconnect the load, it goes back to operating normally. The whole point of relays is to allow higher loads, so I think this should be addressed.
3 people found this helpful
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