Dual alternator not required at all. And certainly not mandated by the 24V setup - that's to handle large draw and large batteries more easily and has nothing to do with the input side - whether DC-DC or DC-AC-DC or solar or shore.My electrical totally changed. So by going 24v with dc/ac/dc i pretty much need to order the dual alternator to make this system worth while right? I know I'm going overboard with this system but there would be no worries for inclement weather since part of my plan is to use this for skiing with a epic pass. I can also switch from propane for stove and water heater.
The stock single alternator is already 250A and still supports the 175A CCP2 (though not every rig seems to come with it - not sure what that requires when ordered). The advantage to the dual alternator seems to be supporting the full 150A draw at idle - without needing to do a high-idle setup.
That said, most of the folks that did the high-idle had the older 150A alternator. I'm not sure if anyone has tested 150A idle with the 250A alternator. But, worst-case, you'd add a high-idle setup. Or lower the draw until it runs acceptably - which would still be MORE power than most solar. Very few rigs are 800W or more and I'm pretty sure that would run at idle.
The 24V part is a near no-cost change if you're doing Victron (except for the ~$100 24VDC>12VDC converter). If you run solar, that cost is sometimes offset by the lower cost of the MPPT - you get double your money on a higher voltage controller. The advantage is easier to control wires, higher efficiency / lower heat.
We're running both electric induction stove-top AND propane oven/stove-top as well as the electric water heater in this rig. The last rig was only induction and no water heater. Basically, it's a battery / storage question plus ability to re-fill whatever you consume. If you don't mind paying for the battery, then it's just whether you're comfortable with your method of restoring the energy.
We can go 3-5 days with zero input if we want to. Then shore-charge for four hours and be full again. (Assuming near dead batteries and access to 20A input.) We could function with no alternator OR solar.