The COTEK S Series of pure sine wave inverters are now discontinued meaning they are no longer available. Please check out their replacement, the SP Series. The COTEK S Series offered superior quality pure sine wave output, the S series stand-alone inverters were available in 12/24/48V models from 150 to 1500 watts. They are ideally suited for electrical systems that already have a quality battery charger. Designed for industrial and recreational applications, their AC power output is capable of handling both heavy duty and smaller, multiple AC loads.