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

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

Product ID: 160834719

Details

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

⚡12V-36V input range

🔋0.1V control accuracy

🔌20A max instantaneous current

8.55 OMR

Duties & taxes included

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Description

🔋 Protect your power, prolong your performance!

WIDE COMPATIBILITY - Supports lead acid, lithium-ion, and solar panel batteries from 12V to 36V—versatility that fits your tech ecosystem.
COMPACT EFFICIENT - Miniature 57x42x19mm design with <1.5W power consumption—powerful protection without bulk.
USER FRIENDLY INTERFACE - 3-digit red LED display and onboard push button for quick, hassle-free voltage setting.
PRECISION VOLTAGE CONTROL - Set and protect your battery with 0.1V accuracy for ultimate power management.
SMART OVER DISCHARGE PROTECTION - Automatically disconnects load to extend battery life and prevent costly damage—because your gear deserves the best.

The Onyehn 2pcs 12V-36V DC Voltage Protection Module offers precise, programmable over-discharge protection for lead acid and lithium-ion batteries. Featuring a compact design, 0.1V control accuracy, and a user-friendly LED interface, it automatically disconnects loads to prevent battery damage and extend lifespan. Ideal for professionals seeking reliable, efficient battery management in a sleek, easy-to-use package.

Specifications

ASIN	B07QNXM4LS
Best Sellers Rank	#41,494 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #24 in Electromechanical Controllers
Brand Name	Onyehn
Color	black,gray
Customer Reviews	4.3 4.3 out of 5 stars (505)
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 Kilograms
Manufacturer	Onyehn
Material Type	Lead
Model	XH-M609
Part Number	XH-M609
Smart Home Compatibility	Not Smart Home Compatible
Unit Count	2.0 Count

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