We tested several methods to tow-charge an EV, including putting the EV in drive and reverse. But every one of them was a bad idea.
Regenerative braking is one of the neatest features on electric vehicles. By running the motor backwards , it becomes a generator that puts electricity back into the battery while providing a braking force. It doesn't matter how the vehicle got moving in the first place - under its own power, rolling down a hill, or otherwise - it works. Clever folks put 2 and 2 together and realized that it should also work if the EV is being flat towed with its regenerative braking engaged.
The biggest issue is the Rivian's"hold" feature, which automatically applies the brakes when the truck is stopped and your foot is off the accelerator. It's designed to keep the truck from accidentally rolling away, and it's handy driving around town sitting at traffic lights all day. For this process, it was a major pain in the ass.
Unlike most other vehicles with a hold function, the Rivian's can't be directly turned off. As such, the best workaround we found was putting the R1T in neutral and allowing the Tundra to pull it up to 10 mph before engaging drive and the regenerative brakes. We later learned of another workaround, which is to put the truck into Off-Road Rock Crawl mode, which disables the hold function.
We also didn't observe any difference between"normal" regenerative braking and"high." With the driver's foot completely off the accelerator, maximum regenerative braking was engaged either way and there was no difference in the amount of power being generated.While we eventually perfected the procedure, it was by no means easy on the Tundra. With the R1T applying full regenerative braking, the Tundra was working hard to accelerate.
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