Hi Gary ...
Progressive Dynamics was the first company to come out with an electronically regulated converter in the 9100 series. The Charge Wizard adds microprocessor controlled multi mode battery charging to the converter. Originally the Charge Wizard was a separate pendant that plugged into the converter, later it was included internally in the 9200 and 4600 series converters.
The original setup is still being offered with the external pendant for the 9100 series converters, without the Charge Wizard they're a very good single stage 13.6 volt converter. The Charge Wizard pendant ($25) makes it into an intelligent multi-stage charger with bulk, absorption, float and storage modes that can also be manually selected via a pushbutton on the pendant.
Progressive's 9200 series converters include the Charge Wizard internally and it controls the output voltage just like the 9100 series with the Charge Wizard. However, there's no way to manually select what mode you want unless you buy an external control pendant ($17), which is just a switch and an LED.
They also make their 4600 series Upgrade converters as a direct drop-in replacement for the older Magnetek chassis. These include the Charge Wizard but do not offer a way to manually select the different modes.
Any of these will do a better job managing your batteries than a single stage converter. They pretty much run themselves, but keep in mind, they're only active when you're on shore power or running the generator.
I did some fooling around when I first got my 9100 series converter and I was able to add a manual voltage control to the Charge Wizard pendant to let me set whatever output voltage I want, from about 11 volts to over 16 volts. This primarily lets me boost the charging voltage when I'm running the generator to push lots of current into the batteries and minimize the run time. A secondary reason is to let me make sure my batteries are fully charged according to the manufacturer's specifications when I'm on shore power. But like I said above, this means you have to proactively manage the charging cycle and make sure the batteries don't run low on water.
Using the Charge Wizard, and occasionally running higher voltages on a generator, I'd have to add water to the batteries every week or two when I was boondocking and moving lots of power in and out of the batteries. But when I was on shore power and not actively using the batteries, they'd use little or no water for months at a time.
In the 9200 converters, the Charge Wizard is installed internally so the same control pins aren't brought outside the box. I don't have a 9200 converter, so I don't have any idea how, or if, it can be modified for manual voltage control.
https://www.progressivedyn.com/rv/power-converters/