DC power for Elite Desktop Mini

[Visualizer]

Hello, 

I'm an amateur astronomer and would like to use my Elite Desktop Mini at the remote telescope site but can't have AC power at the site. I wish to use DC from a battery power box.

Before I spend money and more hours with Google I have a question for a PC computer whiz.

I've purchased a refurbished HP Elitedesk Mini to be the computer at my scope but it is remote and running off of 12v DC.

On my battery power supply at the scope, I have a USB-C PD charging port and I would like to know if this will power my computer. 

The wattage is entirely adequate.

Alternatively, I can do an up-coverter regulator to provide 19.5V, 3.3A

The reason I ask is that the mini desktop comes with a laptop style AC power supply brick which has the *smart tip* third contact pin inside which was intended to make sure that you only use an HP adapter ($$$).

Using search pages I've found DC car chargers and USB-C charging cords that output to the 7.4mm barrel connector for the HP laptops but this desktop doesn't have a battery so I guess my question is – does anyone know if these aftermarket 'charging cords' provide the full voltage and current for operating the mini-computer? It would seem likely but I don't know if the power socket at the computer needs to see the proper voltage or data from the *smart tip* or is that wizardry happen at the AC power brick and the computer just passively accepts what comes to it as long as it is the proper 19.5V and 3.3A.

Inquiring minds want to know...

Thanks in advance

Brian

[itsmyname]

@Visualizer -- provide 19.5V, 3.3A

I think that three 6-volt "marine" batteries can provide 18 V, with lots of amperage.

Is that "close-enough" to 19.5 Volts to keep the computer "happy ?

Do you have a gasoline-powered generator that can recharge those batteries? 

Or, solar panels -- but they probably don't work in the hours when you are using your telescope.