Hi Phil,
It did not have a built in generator--and for four years I managed nicely without one.
The Magnum is not yet back from warranty repair, so I'm using a 1000 watt PSW unit.
When I had flooded Marine jars I got high charging rates, but now that I'm using telecom batteries, the only time I see power flowing to the house from the alternator is when I have a 300 watt load on the house.
I've not had this low a wattage available to me for a lot of years.
The starter battery is due for replacement. I'm hoping if I go AGM I'll start seeing more amps to the house jars again.