1- i’ve two 300kv maytech motors from scramboards, something that worries me is the length of cables, the large ones are from the motor, and the short one is the sensor lead, this is safe?
5- all the EMTB boards I’ve seen, are using two boxes one for the 2 ESCs and another for the batteries, if my motor cables are so large i can use only one box in the middle of the board? if this is a bad idea why?
i limited the VESC’s erpm to 60.000 and the motor max to 60A.
i’m running the motors in BLDC mode, i would like the FOC mode but I don’t want to fry the 2 VESCs.
i’m using 2 lipos Floureon 6S 22.2V 8000mAh 35C each one, I don’t have any problems running at 12S.
I’ve tried the FVT ESC at 12S 44.4v and fried it, i learnt by the hard way the max is 6s…
i realize that i have much less range than my street eboard (30km) vs eMTB (3-4km), i would like to try 190kv motors if this can improve the range and torque, any idea?
Wait… so how many kilometers can u do with emtb? 4km versus 30km sounds terrible… maybe you made a typo… 14km might seem ok (even good) with 8000mah battery
3.7 x 12 x 8 = 355wh
So even at nominal capacity and 20wh consumtion, u should be able to go around 17km i think or so.
You are lossing already 43% of your performance because of the too high kv. Because 300kv at 12S is good for 105840 ERPM. But the limit is 60000 ERPM. Your topspeed at 60000 is 54,7 km/h.
In theory your gering at 12S would be capable of 96 km/h if there wouldn’t be the 60000 limit. So i would recommend to get other motors. 190kv should be fine.
Normally for Lipos i would recommend 3,6v cutoff start and 3,4V cutof end. But i think 3,5 and 3,3 is also fine. Depends a bit on the Lipos and once you realize the VESC reduces the power because of those limits you should try to stop your ride. With Li-Ion you can continue longer because lipos kind of collapse if you discharge them too low.
I have those motors from scramboards. They were included in a complete MTB from scramboards. I used 2 vescs from Flier ESC in china. They come with heatsink. Worked good once I got them configured. A little slow on take off, but scary fast (to me anyway) once you get beyond 20mph. When it was up to 26mph, the motors still had quite a bit of punch. That was faster than I wanted to go.
Cables being that long doesn’t seem to be an issue. I am using one box in the middle with battery and ESC in the same box. I think if I was going to build a new E-MTB, I would go for two separate boxes. I would feel more comfortable having the battery separate from the ESC’s. Just from seeing that video of “jens?” torturing his board and the esc caught fire, but it was separate from the battery.
I got about 35 miles in that configuration. Then one day I was going to do an errand and one of my wheels wouldn’t spin. I had a failure on one of the vescs. Motors are still strong, but, using a 10s battery and 300KV motor, it eventually killed the vesc. The vesc no longer responds. Can’t read the logs or anything.
I have removed the last vesc and replaced with a dual ESC. Flier ESC sent me a replacement VESC with little question. Doesn’t seem like there are any issues with high KV motors with the dual ESC. It runs the motors pretty strong. Much stronger acceleration than the vesc. Brakes are literally killer. Like, they will lock up if you barely touch the trigger in the default config. I have toned them down, but haven’t had much time to get a feel for the new esc. Just rode it for 15 minutes today to test the configuration.