Mtb battery question

DEEIF · October 23, 2019, 3:27pm

Thanks! What wheel pulleys are you using?

Venom121212 · October 23, 2019, 3:46pm

Ones from @IDEA.

They are pricey but he includes everything nicely packaged and labeled

Flasher · October 23, 2019, 3:47pm

Do you get a lot of punch with that ratio? I’m on 15/44

Venom121212 · October 23, 2019, 3:50pm

I can’t full throttle from a start but I could use a bit more on really steep dirt hills. Enough torque that I haven’t bought other pulleys

Saturn_Corp · October 23, 2019, 3:54pm

What batt and motor max amps do you have set?

I’m using roughly the same ratio with 150kv’s at very low power settings and don’t get that umpfh I’d need for wheelies because I’m already at risk of falling off under acceleration.

Venom121212 · October 23, 2019, 3:57pm

Battery at 95A, motors at 60A normally. I kicked it up to 80A on the motors now that’s its been colder.

370HSSV · October 23, 2019, 4:04pm

@DEEIF You can try mine next time you come to the outlaw race. 1:6.25 and 130kv or my buddy’s 1:5 and 150kv.

Creavenger · October 23, 2019, 4:40pm

I use a 12s6p and use about 12wh/km on my MTB. Longest trip I did is just 23km but still had plenty of range

Saturn_Corp · October 23, 2019, 4:48pm

I’ve been lucky to get down to 21wh/mi mixed terrain but flat and going 15mph ish.

It’s no fun riding that economically though.

DEEIF · October 23, 2019, 4:54pm

Damn! Thanks! Are you gonna be at the next one on Nov 3?

Lee_Wright · October 23, 2019, 4:54pm

I’m around 12-15wh/mi on roads and light trails, but proper off road stuff no chance, not for a guy of my weight. I ride 10S8P though so

Creavenger · October 23, 2019, 4:58pm

Thats quite efficient, I wonder what I would get with helical geardrives Whats your average range?

Lee_Wright · October 23, 2019, 4:59pm

I’ve only rinsed the battery once, we did 25 miles but it was full throttle the whole way on concrete. I had some left but cant remember what. I think 30 miles would be achievable at reasonable power levels

DEEIF · October 23, 2019, 5:00pm

What you guys think for runnin a 12s5p for an Emtb… Mostly street and rides with only a 15-25mph avg… I only weigh 100 pounds

Lee_Wright · October 23, 2019, 5:01pm

I think that would be a nice battery size bro

Saturn_Corp · October 23, 2019, 5:01pm

That should get you some good range even if you’re blasting it.

DEEIF · October 23, 2019, 5:02pm

Yay… I’m hoping for 20ish miles which seems acceptable as I get 13wh/mile on my 12s4p single wheel drive with a ton of hills… (9wh/km)

Creavenger · October 23, 2019, 5:03pm

Nice! Ive yet to run my pack fully dry from being charged up I think my legs would give out first tbh xD Thinking of making a concave to make it more comfy or maybe get some better shoes idk. A concave mod would perhabs be a cool video idea if you are interested in that

Lee_Wright · October 23, 2019, 5:04pm

I have it logged as a video idea, I have the printer to do it but not sure if I would personally like it as I wear full bindings with heels when I am tooling around in the woods… kinda makes concave mods a bit pointless I guess?

Pedrodemio · October 23, 2019, 5:24pm

What pressure do you run on tires? I think this is the main culprit of people getting poor efficiency, when I tested my 6.5" tires I pumped them as much as I could with a hand pump, and consumed just 1~2 Wh/km more than with 85mm wheels