The 8355 is a 30 Amp Power Center with a three stage 55 Amp Converter Charger. Manufactured to operate on 120VAC 15 amp branch circuits leaving plenty of power for running other 120VAC devices. The unit is built with a durable steel enclosure and has an 11 position fuse block with blown fuse indicators. Can be upgraded to TempAssure? technology by installing the Parallax 4400TAU module to maximize battery charging.