4000 watt pure sine inverter REP4000 is a 4000 Watt Pure Sine inverter, 24 VDC input, 120/220 VAC output, 50/60 Hz. It intelligently integrates a 110 Amp 4 stage Battery Charger and a 70 Amp Transfer Relay into an advanced and affordable off-grid power solution. REP Series is a adaptive battery charger, transfer relay All in ONE unit. Samlex Evolution Series inverter/chargers provide reliable AC power wherever its needed. For use with boats, RVs, cabins and specialty vehicles, as well as alternative energy, back-up and emergency power applications.