Yadea Rayman upgrading

[talgar]

Hi
Here im introducing to my escooter is a Yadea Rayman bought in 2021 originally sold with a 2000w hub motor 45A controler and 72v20ah lead acid acid battery very basic spec yes I know but i loved the quality build of the chassis and in general of the bike is well made that I started to upgrade since a year now
Little by little to be able to do long road trips with my girlfriend for example

I first changed the motor for a qsmotor 3000w 12inch and 80A controller
Then i changed the battery for a 72v55ah li ion with 100A jkbms
I changed the rough rear suspension for a gas recently because of my back issues
And i m thinking about changing suspension brake and all front wheel for a 17 inch too...for the same reason and have better braking

Do you think will be good idea to have such difference between rear and front wheel size ?

Im about to put a Inverter with 120v Ac outlet too for my work and be able to use my escooter as a powerbank

 

[talgar]

Im thinking about getting a new controller
Maybe a votol em 200 or em 300?
I am setting higher because i want get too a hub qsmotor of 10000w with 360N por meter this year ! Be able to climb huge mountains at 300kg is my goal
My battery still only a jkbms 100A maybe will be the weak part of my bike?

 

[j bjork]

For a 10kw motor something like a fardriver 961800 would make more sense.
I dont think you have a battery that can handle that.
For the motor you have now something like em 150 or 200 probably makes sense, but it sounds like your battery is limiting pretty bad as it is already.

 

[talgar]

Yes I know im thinking about replace the JKbms for a 150A too when i will get it there hard too found where i live
But even then it will be not enough for a 200 o 300 Votol

I know that my motor will be way bigger than the rest of my setting
But the idea is not too change it all the time and like this it will be here too stay for years and years barely heating!
Little by little i will get bigger battery
My goal right now is not the speed if i go 100kph for me is enough But the torque
I want to be able to go up the uge mountains we have her with heavyweight near of 300kg
I think a 10000w even with a 100A battery will do it or i will need 150A?
It will barely heat is this the best! No really the speed i dont care

 

[willstealthy]

I'm not an expert but if you have a 100amp battery I don't know votol but something like a fardriver 72360.. 190 max amps and 360phase should be able to drive your motor about 7k watts being your battery the limiting factor. You can set the controller to 100amp..

 

[talgar]

Wich have the best programación software fardriver or votol?
fardriver look smaller than votols
For example fardriver 72680 are smaller than votol em200 but stronger no?

 

[willstealthy]

There seems to be more information around for the fardriver and if you have the bt module you can program on your phone, the nd72680 is 680 phase and 350 amp..more than enough but might be larger. I don't know the votol.. to speak about it although I assume it's 200amp capable as well. But your battery is 100amp.

 

[talgar]

Yes I know have to change the bms for a bd6a24s20p i guess is the biggest Jkbms they have I cannot found bigger? And will only give me 200A
The nd72680 is so small 18cm
When the em200 is 28cm and only 550A phase

 

[talgar]

So i heard that i have to set module in my battery
Does it mean that i need more bms like for example with one jk 10p and on jk12p give me 220A if i understand
There is some explanation how to do it somewhere?

 

[talgar]

Hi i have a 72v55ah li ion battery with a bd2a24s10p jkbms
Theorically i can only take 100A of this battery in continuously no?
How can I increase the discharge capacity to be able to use stronger controller like fardriver of 200 or 300A ?
Have heard of module but i dont know how it work
I can put a bigger bms but i think it will damage my cells no ?

 

[neptronix]

Your cell's power output is what it is and cannot be increased.
You can put a more powerful BMS on but if the cells can't take 2x the load ( really, really likely ), they could cut out early due to extreme sag.. and possible that if you abuse them too much they could catch fire.

ps the output specs of most batteries are usually overstated, extra headroom in spec doesn't really exist in batteries.

 

[talgar]

So there nothing i can do...? Than add more cells what i cant do because dont have space
And if i divide my battery un two parts and set one jkbms for each part ? What will happen in this case ? Will have 200A?

 

[talgar]

How are doing people with bigger controller ? What battery does the use to get thos 300Amp continuous and even more ?

 

[talgar]

Lifepo4?

 

[Dui ni shuo de dui]

How are doing people with bigger controller ? What battery does the use to get thos 300Amp continuous and even more ?

I use the A123 prismatic cells, they can safely deliver that kind of power, but they are kinda old tech and I don't know if you can easily find em anymore.

I know that my motor will be way bigger than the rest of my setting
But the idea is not too change it all the time and like this it will be here too stay for years and years barely heating!
Little by little i will get bigger battery
My goal right now is not the speed if i go 100kph for me is enough But the torque
I want to be able to go up the uge mountains we have her with heavyweight near of 300kg
I think a 10000w even with a 100A battery will do it or i will need 150A?
It will barely heat is this the best! No really the speed i dont care

This should work, in my opinion this is a good strategy. From what I understand you don't need too much power but you need a lot of heat efficiency and/or dissipation. Higher rated motors will typically heat less and will be able to tolerate more heat in general so that's the way to go. 10KW seem a bit overkill, but I don't know where you live so why not.
Just don't go for a too low rated controller, the reason is that it might overheat even if you drive the motor at relatively low power. A Votol EM300 or EM200 should be ok though.

As other people stated, your battery is the weak link. But contrary to what some people stated, your BMS isn't the weak link, as it should be dimensioned to match your battery cells specs. What I mean is that you should resist the temptation to replace the BMS with a higher rated one, beause there's a real risk of damaging your cells if you go over their rated maximum discharge current.

The Votol controllers are programmable so that's not an issue, you just need to set the controller maximum current a little bit lower than you maximum rated BMS current and voila. You won't be able to use the full potential of the controller, so it should heat less. You won't be even close to use the maximum rated power of your motor, so it will heat even less. Will it be enough to haul 300kg in a steep incline (define what's steep?) I can't say. You'll have to see it for yourself! But if it can't then you'll "just have" to replace your battery and reprogram your controller for higher power output.

Good luck with your build!

 

[talgar]

Steep is something like more of 17 degree....
Im thinking about a 5kw motor with a nd72360 fardriver
I heard that fardriver are better than votol and i cant found em300 where i live
In the future i will build a lifepo4 of 100ah that the best cell i could found here i already have a bms of b2A24s15p for that....
If i set 2 bms in this one maybe I will get those 300a with that battery...

 

[Dui ni shuo de dui]

In the future i will build a lifepo4 of 100ah that the best cell i could found here i already have a bms of b2A24s15p for that....
If i set 2 bms in this one maybe I will get those 300a with that battery...

Just buy a 300A BMS, there's no reason for using two.

 

[talgar]

But they dont have a jkbms of 300A ?no?
The maximum is 200A?
Maybe another brand ?

 

[Dui ni shuo de dui]

But they dont have a jkbms of 300A ?no?
The maximum is 200A?
Maybe another brand ?

Not sure why would you need it to be jkbms exactly?
I use ANT BMS an it is rated at 300A continuous. It can even tolerate peaks close to 600A. Works great.