> I have an exceedingly cheap and cheerful petrol motor powered alternator 
> rated at about 700 watts max. (Cost about $US65 new).
> 
> Voltage stability at constant load is "OK" but if you step-change the 
> load it surges extremely badly. Variation is enough for incandescent 
> bulbs to dim badly and/or get VERY bright for a second or so. I measured 
> the surges a while ago but don't recall the results - very nasty is 
> enough to know. Some loads don't mind this while others would die.

Maybe this:

http://www.apc.com/products

Ling SM
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