I am thinking of buying this Cobra 2500W inverter. http://cgi.ebay.ca/BRAND-NEW-COBRA-CPI-2...A1%7C240%3A1318 My questions are: 1) Are Cobra inverters of good quality? 2)This inverter has a surge rating of 5000w. I measured the start-up current of my portable 120v air compressor with a scope and it drew 50 amps for 200 milliseconds. 50 amps translates to 6000w, does that mean that this inverter will not be able to start up my compressor? Thanks in advance for any input.