--- product_id: 373314962 title: "2pcs 12V-36V DC Voltage Protection Module Digital Low Voltage Protector Disconnect Switch Over Discharge Protection Module" brand: "onyehn" price: "135 zł" currency: PLN in_stock: true reviews_count: 5 category: "Onyehn" url: https://www.desertcart.pl/products/373314962-2pcs-12v-36v-dc-voltage-protection-module-digital-low-voltage store_origin: PL region: Poland --- # 12-36V DC input range 20A max current breaker 3-digit red LED display 2pcs 12V-36V DC Voltage Protection Module Digital Low Voltage Protector Disconnect Switch Over Discharge Protection Module **Brand:** onyehn **Price:** 135 zł **Availability:** ✅ In Stock ## Summary > 🔋 Protect your power, prolong your potential. ## Quick Answers - **What is this?** 2pcs 12V-36V DC Voltage Protection Module Digital Low Voltage Protector Disconnect Switch Over Discharge Protection Module by onyehn - **How much does it cost?** 135 zł with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/373314962-2pcs-12v-36v-dc-voltage-protection-module-digital-low-voltage) ## Best For - onyehn enthusiasts ## Why This Product - Trusted onyehn brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Dual Module Pack:** Two protection modules included for versatile or backup use—double the safety. - • **Compact & Lightweight:** 57x42x19mm size fits seamlessly into tight setups without bulk. - • **Smart Auto Disconnect:** Automatically cuts off load at preset voltage to prevent over-discharge damage. - • **User-Friendly Interface:** Onboard push button and clear LED display make customization effortless. - • **Precision Voltage Control:** 0.1V accuracy ensures your batteries never dip too low, maximizing lifespan. ## Overview This 2-pack DC voltage protection module safeguards 12-36V lead acid and lithium ion batteries by automatically disconnecting loads at low voltage thresholds with 0.1V precision. Featuring a compact design, 3-digit LED display, and programmable settings, it prevents over-discharge to extend battery life—ideal for solar setups and portable power systems. ## Description NOTICE: 1.Programmable battery low voltage disconnect switch for DC12-36V lead acid battery and lithium ion battery. It's a protection switch module, not included batteries itself.Compatible Battery: lead acid, lithium ion battery, solar panel battery.Not suitable for battery packs. 2.The relay does not contain a power cut-off switch,remember to cut off the power supply after disconnection, otherwise the module will continue to use the battery until the voltage is 0. 3.Due to the limitation of the size of the PCB board, the relay size of this module is mini and the circuit lines are very thin. The current should not be too large during actual use. If the current exceeds 8A, the relay contacts may be blown and cannot be used normally. Package Included: 2x Protection Module. How to use: The first time a new battery is used, the rated voltage value is close to the actual value, Judgment to stop the discharge voltage. A reasonable discharge voltage value can be obtained according to the general voltage calculation method of the battery. When the old battery is used, the actual voltage value and the rated voltage value are quite different, so you need to measure the stop voltage value in actual use. Battery charging usually uses slow charging (the voltage and current of fast charging are relatively large, and the battery is easily damaged.) The charging voltage of slow charging is 1.2 times the rated voltage, and the charging current is adjusted to about 2/10 of the rated capacity current of the battery. For example: the charging voltage of a 6V 50Ah battery is about 7.2V, adjust the charging current to 10A. Review: Used these as a way to turn on and off a relay for my solar setup. I found without a device like this, my batteries would be drained below optimal levels which could damage the batteries. This turns off the relay so my EcoFlow stops pulling power from the batteries till the on voltage is achieved again. Review: Good buy ## Features - Board Size: 57 X 42 X 19mm/2.24 X 1.65 X 0.75inch(L*W*H), Input Voltage Range: DC12-36V, Control Accuracy: 0.1V, Power Consumption: <1.5W, Maximum Amperage before Breaker Trips: 20A.(Note:Due to the limitation of the size of the PCB board, the relay size of this module is mini and the circuit lines are very thin. The current should not be too large during actual use. If the current exceeds 8A, the relay contacts may be blown and cannot be used normally.) Package Included:2x Protection Module. - Programmable battery low voltage disconnect switch for DC12-36V lead acid battery and lithium ion battery. It's a protection switch module, not included batteries itself.Compatible Battery: lead acid, lithium ion battery, solar panel battery.Not suitable for battery packs. - On-board momentary push button to set the low voltage disconnect parameter and 3 digit red LED display the parameter easy to operation.When the battery voltage reach the setting values, the module will disconnect load automatically to aviod the battery from over discharging to prolong the battery lifetime. (Note:The relay does not contain a power cut-off switch,remember to cut off the power supply after disconnection, otherwise the module will continue to use the battery until the voltage is 0.) - Reset:When the power is off, press and hold the two buttons at the same time, and then power on. At this time, the screen displays "888", indicating that the factory settings are restored.The factory-set protection value: 12V, difference value: 2V.Difference Value"is the value between the battery voltage to disconnect and the battery voltage to reconnect. - Display is accurate, the switch module is quickly to open and close when near minimum voltage; Settings is stored non-volatile, it can keep set when power off ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07QNXM4LS | | Brand Name | Onyehn | | Color | red | | Customer Reviews | 4.3 4.3 out of 5 stars (467) | | Display Type | LED | | Included Components | 2x Protection Module | | Item Dimensions L x W x H | 5.7L x 4.2W x 1.9H centimeters | | Item Weight | 0.06 Kilograms | | Manufacturer | Onyehn | | Material Type | Lead | ## Product Details - **Brand:** Onyehn - **Colour:** red - **Item weight:** 0.06 Kilograms - **Material:** Lead - **Product dimensions:** 5.7L x 4.2W x 1.9H centimeters ## Images ![2pcs 12V-36V DC Voltage Protection Module Digital Low Voltage Protector Disconnect Switch Over Discharge Protection Module - Image 1](https://m.media-amazon.com/images/I/71+zHSt8joL.jpg) ## Questions & Answers **Q: I have 20v input and want 6v output can you set the output voltage? I need low voltage protection and the ability to step down the voltage.** A: What you need is called a "buck". There are 3 kinds: step-up, step-down and step-up/down. I use a step up/down buck with this low-voltage cutoff module. As the output voltage from the LiPo battery that I'm using drops from 12.4V at fall charge to 10.4V at minimum operating voltage, the buck maintains a constant 12.0V to the powered device. When the battery reaches it's minimum recommended operating voltage of 10.4V, the low-voltage cutoff module cuts off power to prevent the battery from further discharging. LiPo batteries can be permanently damaged if they fall below about 9V output (and they're expensive to replace!) **Q: Will this work with LiPo batteries?** A: yes **Q: I can connect this to a li ion battery and it will output enough power for a 300w inverter? Something like 25 amps?** A: In your scenario, you would use this module to control a higher amperage relay that can handle the higher load. Just connect the output of the protection module to the control terminals of the larger relay. **Q: Why is imput voltage 12-36 but output is 6-60V? Can this be used with 56V battery?** A: Grammatical error, 36v max, in you're case it it will work if you have access to the connections of the individual cells or banks ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by J***S on 27 December 2025* Used these as a way to turn on and off a relay for my solar setup. I found without a device like this, my batteries would be drained below optimal levels which could damage the batteries. This turns off the relay so my EcoFlow stops pulling power from the batteries till the on voltage is achieved again. ### ⭐⭐⭐⭐⭐ Review *by J***O on 8 March 2026* Good buy ### ⭐⭐⭐⭐ Review *by S***R on 5 September 2024* Another seller of this same item has excellent directions on the amazon page. This seller doesn't. I took off one star for directions. It looks to me like several sellers are selling the same item. The first one I got, from another seller, did not work at all. I opened the first one from this seller and it worked like a champ. And I have a spare. Every feature worked fine. When I lowered the voltage below the cutoff, it cut off great. When I raised it 2V over the cutoff, it came back on. I did not have to adjust the voltage, it was spot on to my meter out of the package. Perfect. I have a 24V LIFEPO4 battery, and it is nominally at about 26V. By 24V, there is almost nothing left in the battery, but my circuit doesn't like low voltage, so the cutoff at 24V makes a clean off, so if I forget to turn it off (yes, I did that once, with bad results), the circuit is protected. This is even higher cutoff than the battery pack bms (2.5V/cell=20V) . ## Frequently Bought Together - Onyehn 2pcs 12V-36V DC Voltage Protection Module Digital Low Voltage Protector Disconnect Switch Over Discharge Protection Module - APIELE 16mm Latching Push Button Switch 12V DC On Off Black Shell with LED Angel Eye Head for 0.63" Mounting Hole with Wire Socket Plug Self-Locking (Blue/Black Shell) - ARRAROWN ZK-1002T 2.0 Channel Bluetooth 5.0 Amplifier Board 200W HiFi Subwoofer Audio AMP with Treble and Bass Control BT and AUX Inputs, DC 12-24V 2.0 Channel Stereo AMP Module for DIY Speakers --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.pl/products/373314962-2pcs-12v-36v-dc-voltage-protection-module-digital-low-voltage](https://www.desertcart.pl/products/373314962-2pcs-12v-36v-dc-voltage-protection-module-digital-low-voltage) --- *Product available on Desertcart Poland* *Store origin: PL* *Last updated: 2026-04-28*