Need help with creating a USB-C power source behind the dash

I recently bought a Rago dash plate and some mounts. I intend to run permanent (hard-wired) charging wires (four USB-C PD) down through the dash. I want them to be wired up from there -- behind the dash -- rather than coming back out the dash to use an exposed power port.

I am looking for enough watts of power to simultaneously fast-charge:

2 large phones (one fast-charges at 20 watts and the other at 29)
1 large tablet (fast-charges at 45 watts)
1 large high-end laptop (fast-charges at 140-watts)

I would need all to be able to charge while the engine is off. If I have to or should make that enabled by use of a switch, that's okay.

So what is the easiest way of doing this?

Should I tap into an existing power source somewhere?

Or would it be easier and safer to mount a power inverter somewhere behind the dash or in the engine compartment and wire it directly to the battery? (I do have a

$90 Krieger 1100 Watt 12V Power Inverter Dual 110V AC Outlets, Installation Kit Included, Automotive Back Up Power Supply For Blenders, Vacuums, Power Tools - ETL Approved Under UL STD 458

Krieger 1100 watt 12V inverter with two 110V AC outlets on hand that I bought a while back but never did anything with). What mounting locations would you suggest?

 

I'd start at the source. Like where's the power to run what all going to come from. Most likely you've the 180 watt alternator on board since it's 1794 with the Off Road package. It's not like you're running a welder or starting a gen set. Total up the total wattage and start from there. Opp's hit wrong key... Sorry! Anyways figure in a reserve capacity say 33% and use that as your additional load. Thankfully not to likely all equipment will be running at one time. I'd draw a schematic and take it from there. That will give you a clue as to what you really need along with the inverter.

 

You’ll need a DC to AC power inverter for the laptop. Laptops use an AC to DC power supply to charge their 19v batteries. So the inverter will be required if the laptop is to share the dash power supply. If you want to plug the laptop in elsewhere, you can run 12v power supply to the dash mount area to charge all of the mobiles. It will be tidier they’re not having to have all the AC to DC converters for all of the mobiles. You could just have the USB C outlets for the mobile cables. Then mount the inverter anywhere that’s convenient and run the 120v outlet to somewhere inconspicuous for the laptop mount.

 

You would need a 12 to 10 GA positive wire to run all this load. 12 GA would be with no reserve. If I had absolutely to do it, I'd run a separate cable from the battery. There's a rubber nipple in the firewall that you can cut off and run your wire safely to the cabin. See a yellow cable here:



You would also need a similar GA negative wire to the closest cabin ground point.

 

The laptop is charged by USB-C cord with an AC adapter on the end. The inverter has two AC ports on it. So if I use the inverter, why do I need a converter? Or am I not following you?

 

The laptop power supply is the AC to DC converter.

 

Thanks. I've already gone through that nipple for my FRAC, so it should be pretty straight forward to feed through it again.

 

There's a second one on passenger side, too.