I have been thinking of doing the same thing, but instead of using a styrofoam box, I was thinking of using a cheap igloo cooler.
That being said, I was thinking of going a different direction and connecting to the cars a/c ducting to the battery box.
I have been looking for a high amp 48v BMS and I came across this on AliExpress. Have you guys seen this? Has anyone tested it already and figured out how well it works? What’s the consumption rate?
https://a.aliexpress.com/_mMM7MrU