PCW-50-60 PowerMax Wireless Power Center with Converter Charger 60 AMP 3 StagePCW 50 60 Powermax Wireless Power Center with Converter and Charger Dual AC input: 100 135VAC 190 240VAC For PCW models a 120VAC 220VAC with 50 amp source is required to supply power. The cooling fan runs only when needed. The automatic charging system works in three steps. 1) A fast charge @ 14. 6 volts to quickly recharge a discharged battery. 2) A normal charge @ 13. 6 volts for a safe, full charge. And 3) a trickle (float) charge @ 3. 2 volts to