Delivered without instructions -- where can a 'user's manual' be found?

Hi, there is a PDF Instructions on the product page -- Product information -- Technical Specification -- User Manual pdf https://images-na.ssl-images-amazon.com/images/I/C1X8DiomGTS.pdf Hope it could help you.

Is the usb output fixed or is it adjustable?

It's not fixed. I had it as high as 13.3 volts in my application of the USB connector. You need to set output to 5v before using any standard usb device.

In the instructions it says to use a diode if using for charging, where does the diode go?

There are two good answers here; when charging a battery with this converter, a series diode should be placed between this device's output and the battery to prevent the battery from attempting to backcharge this device if this device's output drops below battery voltage. In addition... if this device is used as a charge controller for a phototaic (solar) panel, a series diode should also be placed between the panel and this device to ensure that this device will never attempt to backcharge the panel. I suggest the use of a fairly significant Schottky diode for either application.

Constant output voltage with changing input voltage? If I have solar panels as an input with a chaning voltage (+-. 5V) will this affect the output?

Check the limit of input shown in the instruction manual. This unit will regulate voltage or amperage, but not both at the same time.

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DROK DC Buck Converter Adjustable Voltage Regulator 12V 6V-32V to 1.5-32V 5A, LCD Screen Step Down Converter with USB Port and Protective Case

Product ID: 95912782

Details

Brand
DROK
Current Rating
5 Amps
Mounting Type
Rack Mount
Power Source
DC
Product Dimensions
1.57"D x x

⚡5A max output current

📺Large clear LCD display

🔧Adjustable 1.5-32V output range

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Description

⚡ Power your projects with precision and confidence!

ROBUST SAFE - Built-in protections against over-current, short-circuit, reverse polarity & overheating
COMPACT DURABLE - Protective case included for safe, portable use in any workspace
VERSATILE USB PORT - Charge or power USB devices directly, adding convenience to your setup
REAL TIME MONITORING - Dual LCD display shows voltage & current simultaneously for instant feedback
PRECISION POWER CONTROL - Fine-tune voltage from 1.5V to 32V for any project need

The DROK DC Buck Converter is a compact, adjustable voltage regulator supporting input voltages from 6V to 32V and output from 1.5V to 32V at up to 5A. Featuring a large LCD screen for real-time voltage and current display, it includes multiple safety protections and a USB port, all housed in a protective case. Ideal for DIY electronics, solar controllers, and LED drivers, it combines versatility with professional-grade reliability.

Specifications

ASIN	B07JZ2GQJF
Best Sellers Rank	#24,953 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #109 in Power Converters
Brand Name	DROK
Current Rating	5 Amps
Customer Reviews	4.4 4.4 out of 5 stars (1,942)
Item Dimensions D x W x H	1.57"D x 2.58"W x 0.98"H
Manufacturer	DROK
Maximum Frequency	180 KHz
Minimum Frequency	60 Hz
Model	180080AFA
Mounting Type	Rack Mount
Part Number	180080AFA
Power Source	DC
Specification Met	CE, ETL
Unit Count	1 Count

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