Blue Sky Energy Digital Display Charge Controllers are an advanced fully automatic 3-stage charge control system with digital display and will properly charge flooded lead-acid, AGM and GEL batteries resulting in improved battery performance with less maintenance. The dual amp rated controller will deliver. An automatic or manual equalize function is also provided to periodically condition flooded lead-acid batteries. Solar Boost controllers increase charge current by operating the PV module in a manner that allows the module to produce all the power it is capable of. A conventional charge controller simply connects the module to the battery when the battery is discharged. When the 75W module in this example is connected directly to a battery charging at 12 volts its power production is artificially limited to about 53 watts. This wastes a whopping 22 watts or nearly 30% of the available power!