joshuahuang wrote: ↑
Dec 04 2019 4:44pm
how come when the bike accelerates from a stop it draws peak 40a but when you accelerate from say 15 mph it draws less? Is it because the phase current is lower than the battery current?
Yeah.. but to pull over (X)Kw on light e bike, the speed is what you need to keep on pulling tq. Yeah Amps= acceleration, and 8-16mph/second is fast acceleration.. you will have to be around there for the amps to be pulled.
Yea hills will do it. Hills multiply load by the (delta) change in angle.
I have an 8.5Kv, but only pulls 2000w at 40mph on a 80lb bike top. I have the capabilities in battery for 300A contin. I top out, load drops, and I sit there at top speed.... If I had a higher Kv motor I would pull more current, but that is my top.
Kind wish I had more Kv, so I could ride in the max output range for my ebike. Fact is, I could have 2000000 watts, available, based on spec but I will only pull 2000 at top speed...
Also, wind increases with speed exponentially. I hit the wall of wind and top out.
I do pull 8MPH/second on startup and that is 6500w.
I want to know if it is a good idea to shunt mod a Grin 20A SINE controller, and can you measure the shunt resistance to therefore afterwords, to correctly input the number to the CA3.
Best shunt mod thread ever.