The concept of a battery equalizer is with systems that have both: 12 Volt and 24 Volt loads, is to keep them balanced. This makes it so that the batteries in the system charge and discharge equally, to prevent the overcharging of the batteries (battery cooking) and other harms to your system. We at All Battery Sales and Service Online have a nice range of selection, and hope to meet all your battery related needs. With the low and competitve prices you're used to seeing with us, we hope to save you money as well as time, and as always look forward to the privlege of your business.