3-in-1 system that expertly combines an inverter, battery charger and automatic transfer switch into one powerful and lightweight unit. The two 50 amp legs set its performance apart from common 50 amp inverter chargers. The configuration allows users to make full use of a 100 amp shore power service (240V) by passing through up to 12, 000 watts of power! It is also compatible with all 30 amp services. The inverter charger also includes a battery temperature sensor helping extend battery life.