I'm working on quite a big project. It's a permanent installation with 70 x Adafruit HUZZAH32 ESP32 Feather Boards, each connected to 2 x NeoPixel Sticks (8 x WS2812 5050 RGB LED). They all have a 3.7 V - 2000 mAh LiPoly battery connected on the JST jack as a power back up.
Now for my question:
I want to connect the boards to a external power source through the USB connector for running the hole object and charging the batterys.
Can someone help me understand, what i would need to get for that. Is there a way to have like a 70 x USB "wall adapter" or some kind of power converter I can connect all the boards in some way?
I have access to a regular european power outlet (240V)