Tech > Home Brew
Make a Zero run while charging
BrianTRice@gmail.com:
--- Quote from: MrDude_1 on March 30, 2018, 06:54:33 PM ---
--- Quote from: BrianTRice on February 05, 2018, 10:06:20 AM ---SCv2 can easily be connected to the controller terminals, and it is best to do so, because it will minimize the amount of current flowing through the cables.
The motor, when supplied with power from any other power source, will draw less current from the battery.
SoC calculations would then depend on where current is sensed. If it were just one battery, it'd be defined by that battery's BMS. With a Power Tank, maybe it's less clear, but I would hope the current sensors are relative to the battery and not to the controller or motor.
I think the only problem is to run the generator so that it could operate in a stable way despite a variable load or a shifting load (mostly the load is the motor, until there's regen and then it's the battery, and then it'd have to transition to idle without lurching). Or, basically what I said above.
--- End quote ---
I know I am tardy to this party, but the load on the generator will not shift as much as you think. The generator creates AC, that is rectified down to DC and fed to the DC-DC converter, in this case a supercharger brick.
The supercharger is just trying to maintain the full voltage, or the full current. Its likely the bike is not fully charged, so the full output current is the limiting factor. when you're on the throttle, the voltage may dip, but the power draw from the DC-DC input stays the same. the generator load doesnt change. Its always pulling the same 3.x kw... the load might even go down under throttle, if you really nailed it, because if the battery voltage sags enough with constant DC-DC output current, the power drops. so the load on the generator is lower under load... However the load change on the generator is all voltage dependent. and we know the voltage of the zero doesnt change that much under normal riding conditions.
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Oh, I did not interpret this as going through a supercharger brick. With a supercharger acting as a (self-regulating) DC-DC converter, you're absolutely right.
dennis-NL:
Any updates on this item?
Very interesting thinking in this topic.
BrianTRice@gmail.com:
I want to be clear that this has always been inadvisable, and any doubt expressed about that is due to it being theoretically possible and achievable.
The most likely scenario for anyone reading this is that you will cause yourself harm or injury, or you will damage the powertrain.
This is not something anyone should do with their own personal transportation if they cannot handle all the possible failure modes.
JeremyConnors:
Can’t help but be be reminded of this concept by Alta Sorry, I know it’s not the same thing, and never going to happen for them of course, but such a feasible build...
NetPro:
Just out of curiosity, if DC generators were readily available, what voltage would it need to be to work on this project as asked by the OP?
There are some 12 V DC generators available but I recon that voltage (even at a high amperage) would be way too low, right?
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