• The Sol-Ark SA-Limitless-15K hybrid inverter is one of the most versatile inverters on the market today with its simultaneous AC and DC coupling. It includes the inverter, charge controller, and more, all in one package to keep install costs low. The Sol-Ark SA-Limitless-15K is battery agnostic – it can be used with just about any 48V battery on the market. Additional features include parallel stacking, grid sell, meter zero, time of use, smart load, AC coupling, and peak shaving. This product is backed by a 10-year warranty.