Charging case to charge up to 4 batteries at the same time.

Power source

Three options to power the case

• Main power
• XT-60 (7 - 28V DC)
• Banana plug (7 - 28V DC)

24V PSU

I've put 2 server PSU's 460W each in the bottom of the case and connected them in serie.

ATTENTION!! you need to isolate the second PSU from the ground to prevent a short circuit!

You can also use 12v, but then you can not utilise the full potential of the chargers and the current in the wires will be greater.

Internal battery

I did not include an internal battery because I already own some bigger LiPo batteries and I can easily plug those in. There is not a lot of space left in the case, so it would be difficult to fit it in.

Cooling

2 fans for cooling are powered by a DC/DC converter connected to the left charger input.
The DC/DC converter is needed because the fans require 12V and the input voltage can range from 7V up to 28V.

In between the 2 chargers is a 3D printed separator to guide the airflow from one charger to the grid. This prevents the hot air from one charger to go into the next one.

Hardware

• Toolkit RC M6D https://amzn.to/3GcSaNU
• XT-60E https://amzn.to/3QSt63O
• B7W Outdoor.Cases Type 3000 https://amzn.to/46tS1Az
• Panel mounting frame https://www.b-w-international.com/en/outdoor/accessoires/panel-frame-pf-for-b-w-outdoor.cases?c=51
• Carbon Vinyl folie https://amzn.to/47sV25g
• Rocker switch https://amzn.to/3SRH9t9
• 12 AWG wire https://amzn.to/419nib7
• Banana plugs https://amzn.to/3Rbamhg
• Lipo balance charger cable https://amzn.to/3SVy0zO
• JST 7pin https://amzn.to/3un3JiX
• DC/DC converter https://amzn.to/47r0iq1
• Fan https://amzn.to/47prvti
• Standoffs https://nl.aliexpress.com/item/1005002348335932.html
• Screws (M2.5 and M3) https://nl.aliexpress.com/item/32810852732.html
• USB cable https://amzn.to/3MYiqQe
• 2x 12V server PSU
• C14 panel mount https://amzn.to/3sR6CIy

Thanks to

Inspired by The Ultimate Portable Drone Battery Charger by Whirly Bloke

Makerspace Baasrode for helping with the lasercutting.