Have you been able to confirm it will work while driving?
There is no mention of the operation of the new Power Supply in the Manual online.
Like you I want to use to charge batteries, but also I plan to have a truck cap on this truck with my dog boxes for retrieverers. I want to run fans on the when traveling.
If this won't operate while driving, I may scratch it off my order.
I don't know for sure, but it would be very weird if it doesn't - in fact it should work better while driving. The output of an alternator increases substantially when the engine rpms rise vs a low idle.
Basically the dual heavy duty alternators make "more" power when driving than when sitting still, and that 12 volt DC feeds the starter batteries.
The 12 volt starter batteries act like a buffer and feed the inverter - that converts 12 volt DC into ( 2200 watt ) 120 volt AC ( like your house has ).
Literally every implementation of this concept works this way - including the 400 watt / 120 vac inverter that comes standard in most modern vehicles, and that works while driving. With just 400 watts though, those are more for charging cell phones than really powering anything.
My daughter's Toyota does a similar thing and they use it to power some electric blankets in the back seat for the kids.
The only way that it would "not" work is if for some reason, RAM added an interlock to block the inverter while in motion, but that would be highly unlikely. What is more likely is that it will turn off if the engine is not running, or perhaps turn the engine on automatically when in use to keep the starter batteries charged up.
It is very common in the van world to do this kind of thing, for example the Ford Transit has an option for dual 220 amp alternators / dual starter batteries and a customer connection point for the ( + ) that turns on / off with the engine operation. We routinely connect an inverter to that connection point and use it to charge auxiliary batteries in the van and in trailers when driving.
This is also done on promasters but since they only have a max 220 amp alternator, and use some heavy power use equipment such as an electric fan, really only 50 - 60 amps ( 500 - 600 watts ) are available to power the inverter this way. We still do it, but it is less useful.
Almost all of the vans like this have 400 - 800 watts of solar on top as well to feed enough power to run a DC refrigerator when not driving much. That much solar would be difficult to put on a truck without a camper box of some kind.
This next part is slightly speculative on how it will perform - because there is not sufficient info, but it follows from how other vehicles work.
Note that this is packaged with dual ~ 480 amp x 13 volt alternators, so roughly ( 2 ) x ( 13 volt ) x ( 480 amps ) ~ 1300 watts
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ome of that power will be used to run accessories in the truck, such as lights, fans, etc.
The continuous output of the "inverter power system" will likely be more like 2200 watts surge / 1100 watts continuous of 120 vac, similar to a home 15 amp circuit. That is why most home kitchen appliances are designed around an 1100 watt draw, but can still run an 1800 watt blow dryer long enough to keep women happy. If they tried to run a hair salon in their house with that same circuit - it would over heat.
This is VERY similar to the way a honda 2000 generator will behave, just a much bigger fuel tank attached. Obviously some of this is speculation, but a honda 2000 is a very common benchmark for designing things like this.
To significantly exceed this, it would require a generator similar to a honda 7000.
You could also potentially buy a 24 volt heavy duty alternator and mount it to the truck yourself, and use this for charging a house battery. If going down that path, make sure to just buy the single alternator option because most of these implementations are software controlled by the engine computer / controller. That path will cost you roughly $2 - 3 K to fully implement with the alternator controller.