I look at the battery situation as both an advantage and disadvantage. The advantage is you always know the exact mass of the vehicle and can do calculations of distance and towing based on a fixed mass, whereas ICE vehicles actually change mass, and importantly towing behavior, based on the amount of fuel they have used. The other thing is the efficiency factor, because electric motors are inherently more efficient than ICE motors that probably more than offsets the loss of efficiency of the weightstylofone wrote: ↑Thu Dec 19, 2024 7:04 amIf an EV has a big enough battery to tow heavy things for long distances, it will be much more expensive. Suck it up boomers*. It will also have to lug around that battery when it's NOT towing, so you'll be paying again for the inefficiency. I while ago I saw an article about a caravan which had its own battery and motor. That could be one solution, but it was not cheap.
I have also seen the caravan with the battery and drive motors, keeping in mind even they said it was expensive mainly because they were being released for high prices and spec to start with, but prices should drop when aimed at cheaper markets. But in my opinion they have missed the mark here with the caravan pushing itself, that's silly and, as already mentioned, inefficient and adds cost, complexity and weight, here's how I would do it.
The caravan has an underfloor battery, solar panels on the roof, all good so far, but then instead of running motors to drive the caravan you have a feed from the caravan battery to the towing vehicle, there are a number of advantages to this. Firstly, it doesn't matter how much the caravan can push itself, once the towing vehicle is out of charge you stop, so you are inherently limited by the towing vehicle range no matter how much power the caravan holds and can generate, so having the caravan hooked up to the towing vehicle provides lets say essentially double the battery power and doubles the towing range. Second, with solar panels the caravan will be charging the batteries as you travel, increasing the towing distance. Third, you've traveled 800kms and park up for a few days, caravan solar panels charge the tow vehicle battery while its plugged in instead of having to plug it into a charger and pay to charge the tow vehicle.
Anyway that's my thoughts, there are advantages and disadvantages to the fact that a EV has a fixed mass and the inherent efficiency of electric motors over ICE motors more than makes up for that inefficiency.