Hi all, I’m trying to cut through Inboard’s marketing-speak to figure out the physics involved. They didn’t really confirm that they will undercharge, but if they’re not force-feeding a full battery and have no secondary rheostatic or friction-based braking, there’s no other way for the BMS to instamagically make the regen current disappear, right?
Inboard: However, when the battery is full, the current has nowhere to go and braking is disabled to avoid damaging the battery. With the M1, you’ll still be able to engage the brakes with a battery that’s fresh off the charger."
Gongfu Xiongmao: My physics teacher is a hardcore e-skate builder. He said that if you can brake with a M1 “fresh off the charger” the board is converting the current to heat somewhere or putting back into the battery (electricity). Does this mean that the M1 will always be charged under capacity to leave room for braking regeneration current? Isn’t this sacrificing distance for those few clients who happen to live atop large hills? Top speed would be lower, since a lower charge would also mean less top voltage/power too?
Inboard: Hey Gongfu. For us addressing this was more of a safety issue than anything else… not as much for the few clients who live on top of a large hill, but those who don’t but may occasionally start on top of a large hill and expect the brakes to work on a fresh battery. Without this feature they’re in for a dangerous surprise. I can only say we’re using the BMS to manage this extra power, and so far this is not sacrificing advertised distance or advertised top speed.