What size fuse should be used on the input side?

The input at 12v would be 24amps since the output is 288 watts at 48v. Also that raises some concern because the input wires are 16awg, which is rated to handle only about 10amps at 12v. This is not to US wiring standard and could potentially cause a fire. When I asked the seller about this they simply answered "yes, it is ok" with zero explanation as to why. But the facts are it isn't technically safe with those specs. That input wire should be at least 8-10awg if using a 30amp fuse.

So will this go both ways? 12v to 48v up or 48v to 12v down?

No, it is 12v to 48v dc step up converter

Will the output be regulated, that is limited to 3a, 14 watts, regardless of the load? and with no damage to the buc?

Yes, this 12v to 48v converter will automatically adjust the current and power required by the device at the output, provided that the voltage of your device is 6-16v.

I am looking to convert a 18V 5 amp hr RYOBI one plus drill battery to a 12V lighting for an EBIKE is this suitable for this and which one do I need?

Please check the model of 24V TO 12V 10A 120W Step Down,here is the ASIN: B0963J2YBD

DC 12V 20A Voltage Regulator Converter,36V 24V 18V to 12V Step Down Converter Regulator Waterproof Module Transformer

DC 12V 20A Voltage Regulator Converter,36V 24V 18V to 12V Step Down Converter Regulator Waterproof Module Transformer

Product ID: 527823158

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Details

Brand
EAGWELL
Colour
aluminum
Input voltage
48 Volts (DC)
Item dimensions L x W x H
9.8 x 8 x 4
Item weight
0.35 Pounds

⚡96%+ efficiency

💧IP68 waterproof rating

🔋8V-40V input range

Description

⚡ Power your hustle with precision and protection!

SAFETY FIRST ALWAYS - Advanced over-voltage, over-current, and short-circuit protections keep your devices safe and your mind at ease.
COMPACT READY TO GO - Lightweight and portable, this sleek aluminum module fits effortlessly into any setup—power on the move.
POWERHOUSE EFFICIENCY - Delivers a rock-solid 12V output at 3A with over 96% efficiency—max power, minimal waste.
BUILT TO BRAVE THE ELEMENTS - IP68 waterproof design ensures your gear stays protected rain or shine—work anywhere, worry-free.
UNIVERSAL VOLTAGE COMPATIBILITY - Seamlessly steps down from 8V to 40V inputs, supporting 12V, 16V, 18V, 24V, and 36V devices without a hitch.

The DC 12V 20A Voltage Regulator Converter by EAGWELL efficiently converts a wide input range (8V-40V) to a stable 12V output at 3A with over 96% efficiency. Featuring an IP68 waterproof rating, advanced safety protections, and a compact design, it’s engineered for reliable performance across automotive, marine, and industrial applications. With minimal ripple and rapid startup, this durable aluminum module ensures your devices run smoothly in any environment.

Specifications

ASIN	B0BR4VHW51
Best Sellers Rank	56,315 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 389 in Power Transformers (Electronics & Photo)
Box Contents	DC Voltage Converter
Brand Name	EAGWELL
Colour	aluminum
Country of Origin	China
Customer Reviews	5.0 5.0 out of 5 stars (5)
Input Voltage	48 Volts (DC)
Item Dimensions	9.8 x 8 x 4 centimetres
Item Weight	0.35 Pounds
Manufacturer	Eagwell
Manufacturer Part Number	SYJYDY
Model Number	SYJY
Number of Outlets	3
Output Voltage	12 Volts (DC)
Plug Type	type
Power Source	Corded Electric
Product Warranty	1 year warranty
UPC	755346393179

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