You don't "need" a 30A PS.

That charger is only 50W per channel, total max output of 200W. Throw in a 40% safety factor, and you need at least a 280W PS.

If you can afford the PS you linked, it certainly will serve you well, just trying to point out that the way you went about figuring out what you "need" was flawed, so you can make better purchasing decisions.