Charging off of a 24v system

Hey guys,
Wondering if there is a way I can charge my battery off of a bigger 24v system I already have in place. I have a 24v fuse box I’d like to wire this into so that I can use this as my first resort and have it continuously charging off of the other battery.

Does anyone have any similar experience I can mooch off of?
Not sure what products I could buy to safely charge.