> That is way overboard.  If it's just the laptop then 50W will do. 
> There is a simple reason for this.  The (US) National Electrical Code 
> defines low power wiring as anything carrying less than 50W (with a 
> voltage limitation too I think).  Anything over this gets a lot more 
> involved with regard to certification.

With all due respect - bull.  US N.E.C. has nothing to do with real-worl 
usage in this case.

I myself have, (in the ten+ years I've been supporting 
network/desktop/laptop hardware), encountered more than one laptop that 
would peg and shutdown a 140W inverter.  I had a simple PII-233 notebook 
that did it to one of mine and killed the inverter dead.  I'm not 
talking about cheap non-ULish inverters either.

> None of the Apple (or other make) laptop power supply I've seen are 
> rated for more than 50W.  If your laptop was using 200W or more you 
> wouldn't be able to hold it, it would be too hot.

Again - bull.  Try running a new PowerBook on a 50W inverter then don't 
call me when it doesn't work.  As for the heat thing - try an IBM 
ThinkPad 760XL without the heat-patch installed in Windows.  The power 
supply will draw well over 150W during full use and physically overheat 
PCMCIA cards on top of it - that one killed a modem AND a network card 
before IBM admitted the problem.

Mike Hebel



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