For those of you that has bought a power inverter to plug in your Playstation or VCR for the video system, how many watt does it requires to power up both a vcr and a PS together at the same time ? will 50watt be enough ? How about 150watt. I see that most inverters only have one socket. Is it possible to plug in a multi-socket so I can use more then one devices at the same time with enough power ?