ElectricMotorcycleForum.com
Makes And Models => Zero Motorcycles Forum | 2013+ => Topic started by: Doctorbass on July 27, 2017, 06:07:14 AM
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For the first time i noticed that on my 2017 SR the max power i get seem reduced following a perticular curve of the Battery SOC.
It seem to start somewhere around 75% SOC and reduce progressively.
Battery max current vary according to many factors like temperature, soc and age.
However for those who have like me a powertank witch add 25% more capacity, i wonder if that limiting curve is adjusted accordingly as there is more energy availlable total in the battery so the max amp (max power) could follow a different curve.
When the power is reduced the reason is to keep the battery at a certain voltage and not drop to much.
In other words, is the Zero with powertank have different readjusted power curve vs the SOC to take advantage of the more energy = max power that could be sustained on a wider range of SOC?
Doc
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I haven't noticed that (via seat-of-the-pants) with my PT-equipped 2014 S. ??? But then as the battery capacity drops, I do tend to ride slower so as to extend my range. ;) So my personal experience isn't likely too helpful.
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What if it's entirely voltage-sensor-based and the voltage droop under load is just lesser with the Power Tank operating in parallel with the main monolith (5p vs 4p)?
(or maybe that's the point of the original question)
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(or maybe that's the point of the original question)
effectively ;)
Doc
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I would expect with a bigger controller that the 2017 would react differently to a 2016 (smaller controller = less current draw) and a 2015 (smaller battery and older motor rotor)
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I would expect with a bigger controller that the 2017 would react differently to a 2016 (smaller controller = less current draw) and a 2015 (smaller battery and older motor rotor)
The 2017 Gen4.5 controller has (from what I've heard) lower internal resistance in the switching power MOSFETs, so the draw from the battery would be lower for a given amount of torque applied at the rotor.
2016 IPM changes reduced losses in the motor itself, and IIUC battery changes in 2015 and 2016 reduced internal resistance there.
So, voltage droop would keep decreasing year over year, presumably, and so the cutbacks would probably be less significant.
I don't ride my bikes hard, so this is all academic to me. Maybe it makes sense to others.