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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⚡ Step down in style, power up with confidence!

SLEEK DURABLE DESIGN - Protective case included for safe, professional-grade use
STAY INFORMED INSTANTLY - Large digital LCD shows real-time voltage and current
VERSATILE USB INTERFACE - Easily power or charge devices with integrated USB port
BUILT TO PROTECT AND PERFORM - Over-current, short-circuit, and over-temperature safeguards
POWER YOUR PROJECTS WITH PRECISION - Adjustable 1.5V-32V output for tailored voltage needs

The DROK DC Buck Module is a compact, adjustable step-down voltage regulator supporting 6V-32V input and delivering up to 5A output current with 75W max power. Featuring a clear LCD display for real-time voltage and current monitoring, it includes multiple protections (over-current, short-circuit, over-temperature) and a USB port, all housed in a protective case. Ideal for DIY electronics, solar controllers, and precise power supply needs.

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Malaysiastore

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Specification Met	CE, ETL
Manufacturer	DROK
Country of Origin	USA
Model number	180080AFA
Colour	clear black
Item Weight	59 g
Product Dimensions	4 x 6.56 x 2.5 cm; 59 g
Item model number	180080AFA
Item Height	25 Millimeters
Item Width	6.6 Centimeters
Wattage	75 Watts
Are batteries included?	No

DROK DC Buck Module, Adjustable Buck Converter Step Down Voltage Regulator 6V-32V 30V 24V 12V to 1.5-32V 5V 5A LCD Power Supply Volt Reducer Transformer Module Board with USB Port Protective Case

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