There are active power factor circuits that are designed into products that otherwise would have poor power factor. Wonder if something could be designed as as a generic add-on.
http://www.google.com/search?client=opera&rls=en&q=power+factor+correction+device&sourceid=opera&ie=utf-8&oe=utf-8&channel=suggest
Almost all the hits from this search apply to motors (inductive loads) whose current waveform is basically a sine wave out-of-phase with the voltage, and somewhat easy to correct. This unfortunately does not apply to an RV power converter, which is a "non linear" load. The current waveform for a power converter is pretty much in-phase with the voltage, but is not a sine wave. Almost all of the current is drawn during a small amount of time during the voltage peak. Correcting this isn't so simple. Here are a few links specifically about power supplies. One message is that while power factor correction reduces the power consumption in VA terms, it increases it in terms of watts.
Power factor correction in PC power suppliesSWITCH MODE DC POWER SUPPLY TUTORIALPower factor correction for switched mode power suppliesHere's a picture of PD9160A converter waverforms, at maximum power, current on top. IMO all of the non corrected converters will look pretty much the same.
