The Honda E U series (EU 1000, 2000 and 3000) are alternators driving an inverter--has a pure sine wave--and claims to have cleaner power than line power at home. This is a very effecient generator, since the alternator speed varies--and with low loads drops to a fast idle on the econmy setting. I suspect that we will see more of this in the marine and RV fields in the next few years. These units are also very quiet. The lap top is a bit different than a desk top P C, in that there is some degree of filtering via the "brick" power supply--and even further buffering by the battery. Certainly there can be spikes in voltage--but there is perhaps as much or more danger from the DC 12 volt power supply on your boat when the alternator is running. Bob Austin