I don't see how Ram could really get away with slapping a (400ish?) lb generator on top of the full loadout of battery cells from the BEV without it being prohibitively heavy.
If you look at it as a PHEV with an electric focus (compared to the current 4xe ICE focus, or my current Sorento PHEV's ICE focus), and with the same electric engines as the full electric Ram, just with a smaller battery pack and ICE generator, then it makes sense. From my layman's perspective, I envision three use case scenarios for the REPB:
- Electric only. Just like most current PHEVs, X amount of range that runs just on the battery without the ICE generator running. No clue what would be a good range, but maybe something like ~50 miles of unladen range.
- Electric with ICE generator constantly charging. The generator would be running constantly to recharge the batteries under periods of high power usage, such as towing. If set up as a series hybrid, then the generator would not be attached to the drivetrain and would solely charge the batteries.
- Electric with ICE generator coming on as needed. Once the battery dips below X percentage, then the generator comes on to charge it up to Y percentage, then kicks off. Still no connection to the drivetrain.
Going off what I saw from a commenter on an article on the topic on a different site, if his math is correct, then a ~130hp ICE motor would be sufficient to act as a generator to keep the batteries pumping their juice to the electric motors under any load.
Under this kind of operating model, as long as there is gas in the tank for the generator, you get full electric power with none of the range anxiety, albeit with somewhat of an efficiency hit compared to full EV-only.
This is all presuming Ram would have it set up as a series hybrid. If it's set up as a parallel hybrid, then blah, not interested.