I was looking at building my own "power wall" in my shed when I ran across these. I can just grab this and take it wherever I need to. It was far cheaper than buying a charge controller, inverter and some batteries. Especially lithium batteries, they are pricey! Lead acid of any variety (AGM, etc.) are heavy and don't tolerate discharging like LifePO4 bats do. These are the easy button.