is there anyone out there who would like this challenge? We are interested in figuring out how to do this and are open to how to frame the project
What do you want to measure? Only voltage? Or current as well?
If you want to measure both voltage and current for 8 devices that's 16 analog inputs. The simplest option is to grab yourself a mega2560. Then it's just a matter of building some sampling circuits and, possibly, some control circuits. Write a sketch to do the business and it's job done. None of this is particularly difficult. If you're just "monitoring" then it's childs play. If you want to actively control them then you'll have to do some research on the parameters of the devices being charged.