The 5300 Series brings never-before-seen output amperages to 50 amp shore services. Active power factor correction allows for better use of available power and allows converter to operate on 120-volt AC 15-amp branch circuits. TempAssure capable with the Parallax Power Supply patented TempAssure module #77639 (4400TAU), sold separately. Durable steel enclosure. Also a standard replacement lower section for the Parallax 555 power center Quick charge function TempAssure temperature-compensated advanced battery charging capablewith TempAssure module #77639 (4400TAU), sold separately Quick charge function | Parallax Group Inc Parallax Power 5300 Series 50 Amp Service Power Centers - Lower Section Only