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.

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!)

I can connect this to a li ion battery and it will output enough power for a 300w inverter? Something like 25 amps?

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.

Why is imput voltage 12-36 but output is 6-60V? Can this be used with 56V battery?

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

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2pcs 12V-36V DC Voltage Protection Module Over Discharge Protection

Product ID: 160834719

Details

Brand
Onyehn
Color
black gray
Item Weight
0.06 kg
Material
Lead
Product Dimensions
2.24"L x x

⚡12V-36V wide input voltage

🔋Precise 0.1V control accuracy

🔴3-digit LED voltage display

Description

🔌 Protect your power, prolong your battery life — never get caught powerless again!

WIDE VOLTAGE COMPATIBILITY - Seamlessly protects batteries from 12V up to 36V DC, perfect for diverse power setups.
INSTANT 20 A CURRENT HANDLING - Handles surges up to 20A before tripping, safeguarding your system from overloads.
ULTRA PRECISE VOLTAGE CONTROL - 0.1V accuracy ensures your battery disconnects exactly when needed, maximizing lifespan.
NON VOLATILE MEMORY QUICK RESET - Settings are saved even when powered off, with a simple factory reset to restore defaults.
USER FRIENDLY LED DISPLAY CONTROLS - Set and monitor voltage thresholds easily with a clear 3-digit red LED and onboard push button.

The Onyehn 2pcs 12V-36V DC Voltage Protection Module is a compact, programmable battery low voltage disconnect switch designed to prevent over-discharge in lead acid and lithium ion batteries. Featuring a precise 0.1V control accuracy, a clear 3-digit LED display, and support for input voltages from 12V to 36V, it safeguards your battery by automatically disconnecting loads at preset voltage thresholds. With instantaneous current handling up to 20A and non-volatile memory for settings retention, this module is ideal for extending battery life in solar, automotive, and industrial applications.

Specifications

ASIN	B07QNXM4LS
Best Sellers Rank	#173,929 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #286 in Electromechanical Controllers
Brand	Onyehn
Brand Name	Onyehn
Color	black,gray
Customer Reviews	4.2 out of 5 stars 512 Reviews
Display Type	LED
Included Components	2x Protection Module
Item Dimensions L x W x H	2.24"L x 1.65"W x 0.75"H
Item Weight	0.06 kg
Manufacturer	Onyehn
Material	Lead
Material Type	Lead
Model	XH-M609
Number of Items	2
Number of Packs	2
Part Number	XH-M609
Product Dimensions	2.24"L x 1.65"W x 0.75"H
Unit Count	2 Count

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