Hi Eric,

The power cord used also plays a part in the voltage transfer to a phone, etc. (look for 3A Fast Charge)
https://www.amazon.com/gp/product/B08JPJD5Y4/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1 
These cables have a green power on indicator too, which helps you know that the plug on the other end hasn't come undone.

I put this unit in place of the Euro plug, very easy install.. as power was already there!
Also displays the voltage, and powers two devices.  I run a line from it into the glove box, up through the dash to the ashtray, where the power cord exits to my phone holder.  Clean!
https://www.amazon.com/Charger-BAODANTECH-Aluminum-Waterproof-Motorcycle/dp/B07YX3Y7CM/ref=sr_1_28?dchild=1&keywords=usb+dash+boat&qid=1620046317&sr=8-28

I placed another one of these in the back cabinet, upper right corner above the drawer, feeding off the rear battery, so now I have voltage readings on both batteries, and USB from either battery.  https://photos.app.goo.gl/4ckWZ5yATKrfo4dy8

Jack

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Eric Caron
Sent: Sunday, May 2, 2021 9:45 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Not all USB are created equal.

Traveling to my first camp out in the van I used both the GW USB in my glove box and glove box light location, and the dash volt meeter dual USB Dennis installed.  The GW barely kept up with the iPhone being used for navigation.  It was unable to build much of a charge just maintain. I changed to the other USB and the phone charged right up while in use. 

        Dennis also installed a rear USB and it powered some demanding UsB devices.  So. Very glad I ended up with some good ones. 

If I add more I hope to learn what to look for as they are not created equal.

Also, having USB I’m exploring the useful devices out there that allow for USB recharge rather then old AA batteries.  The flash lights, head lamps, and portable fans are amazing, even an over head light with remote control.  And no running out of batteries just charge as needed.

Eric Caron 
85 GL Auto =