What is Reddit's opinion of XCSOURCE 5PCS 5V/9V/12V/24V 1 Channel Relay Shield Module Optocoupler for PIC AVR DSP ARM Arduino TE213?
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>Pi with Wifi and a

My original plan included an existing ESP8266 for Internet so I won't need that any longer. Any reason for the Zero over the 3 B+?

I purchased both but would love to have someone else's opinion on the right solution here.

>12v-capable relay HAT

I haven't ever heard of a relay HAT so I'll have to google it. I bought a bunch of these for the relay: https://www.amazon.com/gp/product/B00ZR3B252/ref=ppx_yo_dt_b_asin_title_o05_s02?ie=UTF8&psc=1

>plus a cheap USB power-bank

I planned on using AC power (w/ a DC converter) to supply power to the relay and I assumed if I used a power supply module or something like that I could just grab 5v off that to power the Arduino and then the usb client would get it's power from the MCU.

I've never messed with the Raspberry products so I'll probably have to re-investigate power options. One problem at a time I suppose - thank you for your advice.