So I'm building a battery box.

Specs are:
(2) 12v12ah sla batteries
(1) 5v2.1ah USB outputs.
(1) 12v dc output (car charger)

So my question is what part do I need to put power into this thing. I could go cave man and put some posts on the top of the thing and hook a car battery charger up to it, however I want a better and more elegant solution.

I can find numerous amounts of wall plug chargers but I can't find the damn parts the wall chargers plug into. I need good recommendations for the actual part(s) a 120v to 13.5v wall chargers plugs into.

I would like to use something like a USB c type wall charger or maybe last gen mini usb

Any help would be greatly appreciated.

 

You could use a USB C PD charger with 45 – 60 watts available from a single port; this provides a 20 volt output at 2¼ to 3 amps.

You'll need a 20 volt USB C PD "trigger" which negotiates with the USB C PD charger to provide a 20 volt output. The triggers have a USB C input connector and are hardly bigger than the USB C connector itself.

To drop the 20 volts to the needed voltage for charging the 12 volt battery you'll need a switching buck mode module.

As far as what's needed for regulating the charge, I'll leave that to others.


Here are links to a PD trigger and buck converter that I'm using with a PD supply to operate my CPAP. Not all PD chargers support 12 volt output, so I opted to use the 20 volt output which is part of the current standard. Using a PD charger reduces both the volume and weight by a factor of 4 compared to the standard 12 volt supply, and I can use the same supply to power my laptop and charge my phone.

[Url = https://www.amazon.com/gp/aw/d/B0B688SKNK?psc=1&ref=ppx_pop_mob_b_asin_title]PD trigger[/url]

Buck Converter

 

Sorry for the poorly formated links!

 

Welcome to AAC!

12v dc output (car charger)

You need more volts for charging a 12V lead acid battery. A fully charged sealed one is about 12.89V. Visit BatteryUniversity for info on safe charging.