New RV USB plugs, what amperage are they?

No one can really answer your question, you will have to try a test charge to find out unless they have marked the ports as to what they are.

USB1/2 ports specifications by PC standards are limited to .250A and USB chargers typically will be .5A-2.4A with newer "C" ports at 3A.

Most of the USB chargers that are unmarked will be 1A or less, 2A ones many times are marked. Two port chargers often "share" current and unless marked that current is divided between both ports. Some of those may deliver full current only when 1 port is used.

If not marked, assume 1A or less per port until you do a test to see how fast your device charges. If it charges too slow then consider using another USB charger.

Probably an inaccurate way of guessing but I installed a couple of extra USB/12 volt ports and they are rated for 2.1 amps. I have not noticed that these charge faster than the installed USB ports. They are advertised as “fast charging” USB ports.

I think the USB "Standard" is 1/2 amp. and many are thus limited..

As you note. Many need 2, 3 or more Some devices will work with lower amps (Cell phones for example) but take longer to charge. (I use plug in adapters when I need speed)

wa8yxm wrote:
I think the USB "Standard" is 1/2 amp. and many are thus limited..

As you note. Many need 2, 3 or more Some devices will work with lower amps (Cell phones for example) but take longer to charge. (I use plug in adapters when I need speed)

Strictly speaking, USB charging was an afterthought and the original intention was to supply a very limited amount of power to devices on those ports for PCs like Keyboard/mouse and as USB became more universally used those current specs were widened.

In the strictest sense of PC USB ports, USB ports were limited to .5A (500Ma), the port then used a internal "hub" to give you multiple USB ports, that .5A was split between all of the hub outputs.

Fast forward a few yrs and newer USB specs allowed for standalone external USB chargers with .5A and then 1.5A and now 2.4A and even 3A all depending on the charger and the chip built into the device you are charging.

All the details you didn't know you wanted to know about USB charging specifications HERE

Generally, most external USB chargers fall into the .5A-2.1A category, some vendors mark the ports, some do not. So the reality is unless marked, assume the minimum of .5A and do a test charge. If the test charge is slower than what you normally see then you have a port that has a lower output. If it is just as quick as your normal charger then it is a higher output than .5A..

Note, it will not hurt your device to charge via a lower amp charger, it just takes a longer time to recharge.

The USB standard and implementation now support Power Density devices that support up to 5A and 48V (240W) for more power. Electronics on each end and a special USB-C cable. Somewhere I read that there is a Apple computer that uses the PD protocol.

In addition data transfer is ramping up - USB4 is 40Gpbs or 4.8GB/s and it uses USB C.

The OP is wanting a RV standard that doesn't exist any more than a home based standard.

I agree with the prior post indicating installed RV ports are likely what's cheap or on hand.

OP Try this: If there was a USB standard for RVs it would already be obsolete and have to evolve. But a basic USB C port for charging would likely be desirable today.

Even todays USB C connector will likely become obsolete in the future like other connectors.

one way to find out https://www.amazon.com/Voltage-Multimeter-Multi-Function-Capacity-Detector/dp/B08QGFMZVG/ref=sr_1_8?crid=11FASW1QV1E8V&keywords=usb+amp+meter&qid=1641923109&sprefix=usb+amp%2Caps%2C306&sr=8-8 or

https://www.amazon.com/MakerHawk-Multimeter-Voltmeter-Capacity-Resistance/dp/B07DCSNHNB/ref=sr_1_7?keywords=usb%2Bamp%2Bmeter&qid=1641923259&sr=8-7&th=1

OP here.

I wasn't looking for a standard, just tell me what's currently installed.

I've installed plenty of USB ports among many other things in RVs, so that's no big deal.

TurnThePage wrote:
OP here.

I wasn't looking for a standard, just tell me what's currently installed.

I've installed plenty of USB ports among many other things in RVs, so that's no big deal.

I think the answer is no one knows...not even the manufacturer...buy the tester if you must know.

TurnThePage wrote:
I appreciate the suggestions and am pretty versed on what's available in the aftermarket. I was just wondering if anybody was knowledgeable about what's typically installed these days.

We'd really need to see the exact style/brand of USB port to know (or research) what the spec is.

I've seen about 5 different style of USB ports used across all the brands of RVs I've looked at.

Outdoors RV uses higher output USB ports. I upgraded my charge panel with more stuff as shown in this video

My first truck camper pre-dated the era of USB charge ports in RVs, so I added a Blue Sea Systems panel as shown in this project