Hub Motor Upgrade 500W to 750W

[devlin016]

around 500 is my budget and the bike shop just wants 50 to install the rear hub on the wheel. I can do all the wiring maybe programming depending on what it really is i am a IT thats qualified in almost everything in that field. i live in a rural farm area people are nice.. im sure he would help me out. so id rather not do 10amps i guess i need to take apart this battery and find some info on this bms...dont worry i wont damage my pack lol this isnt my first rodeo... im not worried about the 2 20 amp controllers overheating. if they do ill just solve that problem when I get to it. like a bigger controller box.

 

[devlin016]

will a bike shop be able to spoke a motor onto my front tire? i have 4 inch wide tires most are 3 and I liked my colored rims id want them matching so I gotta keep the tire....

 

[maanebedotten]

If they can lace a rear wheel, they can do a front as well. Will they do a good job and produce a wheel that stays true and lasts a long time? Maybe, maybe not. It is no more difficult to lace a motor hub than a regular hub, just make sure they use good spokes like Sapim strong 13g/14g butted.

You need to measure your fork dropouts. I think fatties usually are 135mm. If so you can use any "standard" rear motor as most bikes come with 135mm rear dropouts. The Mac motors are considered the best geared hubs out there so go for that if you can find one. You need the 10turn or 8turn version to get the speed you want on 36v. Get a 6-fet programmable controller, they are usually rated at 25A peak and 10-15A continuous. You also need 2 good torque-arms to keep the motor from destroying the dropouts. If you post some details and pics of your controller, display, throttle and pas sensor we might be able to figure out if it is worth keeping, or if getting all new electronics is better.

I stumbled upon this video with a lot of good info on dual motor: https://www.youtube.com/watch?v=Ub4EP2_mAds&list=PLH8T1SX8ZJv-gD2g-oLo_LBDnXP2PjNnR

 

[devlin016]

sorry for the delay im still very interested in doing all this just lifes kinda slowing me down right now. got alot of things going on right now....i still havnt looked at my bms...but my bikes odometer is 530 miles..... 530 isnt that bad and i think at that mileage its safe to assume my controller isnt going to blow..... but i did notice this bikes model is becoming a popular buy since i bought it about 2 years ago. i am able to find people making reviews about it now.
here
https://electrek.co/2020/06/01/ecotric-500w-fat-tire-electric-bike-review-850-dollars/
and here
https://www.youtube.com/watch?v=GpQuJSfuuVU

i was able to get some info from youtube comments... as someone stated the controller is 15 amps.. not sure if we already knew that or not just stating. I was also able to find someone in the comments who accomplished all wheel drive with a 250w but he used a extra battery and a 2nd controller not in controller box. we all know how i want my setup. and i been kinda playing around with this idea of putting a shit ton off copper raspberry pi heatsinks of my hub with thermal adhesive not paste.... that has to do some cooling effect. i wonder if it will be major. it might be...
https://www.digikey.com/product-detail/en/dfrobot/FIT0367/1738-1006-ND/6588428
the plan kinda is to apply this idea to both hubs even if overheating isnt a issue.

i feel like theres no way the heatsinks wont do something and i bet they would get wicked hot. if i sound like a idoit im sorry and please dont lash out at me too hard.

 

[devlin016]

I was really liking the idea of upgrading to this battery. https://www.aliexpress.com/item/4000689290461.html but for bms is says "20Amp continuous 60±10Amp maximum" what does 60+10 mean? is that its peak ?

 

[99t4]

I was really liking the idea of upgrading to this battery. https://www.aliexpress.com/item/4000689290461.html but for bms is says "20Amp continuous 60±10Amp maximum" what does 60+10 mean? is that its peak ?

Look carefully at what you wrote in quotes and what you are asking. 60±10Amp maximum (Sixty plus-or-minus ten) means 50 - 70 Amp maximum. Simple arithmetic. They are giving you a range, not a precise value. Probably best to keep the max draw <50A given that.

Do you like the cells it is made out of?

 

[devlin016]

well im not sure what kind of cells are in my battery pack now but they seem decent enough. But i like the capacity in the aliexpress battery and its a easy replacement for my current battery. what I have now is like 11ah maybe 12ah cant remember. Do you think the aliexpress battery bms can drive 2 controllers and 2 hubs for all wheel drive say maybe 10 amps each or maybe 15 amps each ideally?

 

[devlin016]

I think I understand that the aliexpress battery bms will deliver what I want no problem.I just didnt understand why it would be said like that. but theres even amp room for the controllers to boost. so this is great.