Promblems with BMS rear rack battery

Forgive me if its obvious but how do you switch on rear-mounted bms battery https://bmsbattery.com/ebike-battery/952-18042-48v10ah116ah14ah-case-02-battery-pack.html#/511-inner_controller-without/512-cells_capacity-25ah_high_c_rate_10ah/533-rack-without.

 

Just got it today, as expected no instructions, I charged it for several hours until the light on the charger went green, not only that but how on earth do you connect it to the controller? not that it matters without it working

If you didn't get the integrated controller, there's a compartment at the front for housing a controller. When you open it, you,'ll see what you have to do - usually solder two wires to the back of the connector. Whatever you do, don't get them the wrong way round. Always check with a meter.

 

Those batteries often have a small rocker switch at the back somewhere.

If you didn't get the integrated controller, there's a compartment at the front for housing a controller. When you open it, you,'ll see what you have to do - usually solder two wires to the back of the connector. Whatever you do, don't get them the wrong way round. Always check with a meter.

 

Those batteries often have a small rocker switch at the back somewhere.

Thanks I do not see the switch anywhere though

Thanks I do not see the switch anywhere though

International switch sign:

International switch sign:

 

Yep doesn't work no power at all. Thanks for your help.

Have you connected up a controller yet ?

Yep doesn't work no power at all

How can you tell if you have nothing connected to it?

Try press and hold the switch for a few secs - or even as long as 10 secs. Maybe it has sleep mode.

 

IIRC, that switch works the light in the back as well somehow. I think it has mult-functions. It's possible that the battery terminals at the front are permanently live. Did you test them?

How can you tell if you have nothing connected to it?

 

Pete I didn't know which emoji to use, I was going to use .

I didn't know which emoji to use

I'm having the same problem more and more lately, maybe admin could add a few to cover the more challenging questions/answers.

Try press and hold the switch for a few secs - or even as long as 10 secs. Maybe it has sleep mode.

 

IIRC, that switch works the light in the back as well somehow. I think it has multi-functions. It's possible that the battery terminals at the front are permanently live. Did you test them?

no, i don't have a meter and will not be buying one or a soldering iron either but thanks for your helpful feedback. I held the button down for 30 seconds as I initial thought it had a sleep mode.

If you read the post, correctly it says I had no idea where/how to connect the controller to the battery. So of course I haven't connected the controller The battery came with no instructions, as i also posted, so no point being sarcastic about it and to be honest if I knew I'd have to solder anything I would not have bought it, who spends all that money to then have to solder and potentially ruin an expensive piece of kit, surely the battery should still switch on, without having to solder anything.

no, i don't have a meter and will not be buying one or a soldering iron either but thanks for your helpful feedback. I held the button down for 30 seconds as I initial thought it had a sleep mode.

You shouldn't be messing with ebike stuff if you don't have a meter. It's absolutely essential equipment. You can do a lot of damage without one.

If you read the post, correctly it says I had no idea where/how to connect the controller to the battery. So of course I haven't connected the controller The battery came with no instructions, as i also posted, so no point being sarcastic about it and to be honest if I knew I'd have to solder anything I would not have bought it, who spends all that money to then have to solder and potentially ruin an expensive piece of kit, surely the battery should still switch on, without having to solder anything.

Maybe you should explain what you bought.

Maybe you should explain what you bought.

 

I was referring to the 2 sarcastic people above.

 

I purchased

 

a 500w front wheel 26"

an s12s controller

torque arm

PAS sensor

48v 17ah rear battery with pannier rack

an LCD3 Display

all from bmsbattery

 

The site in question, nor any other site I have visited has mentioned needing a multimeter or soldering iron, when purchasing an e-bike kit I would have just got an e-bike to begin with, instead of converting my old bike.

 

Just looking at woosh bikes website, which another member kindly recommended I look at their bikes, I've just looked through their manual on e-bike kits and no mention of needing a soldering iron or multimeter, so why you say you should not get an e-bike kit without a multimeter, I don't understand, yes maybe after some usage I'd need one, particularly if I have a problem, like I said if the site said i need one, especially a soldering iron, i simply would of not got one

I was referring to the 2 sarcastic people above.

 

I purchased

 

a 500w front wheel 26"

an s12s controller

torque arm

PAS sensor

48v 17ah rear battery with pannier rack

an LCD3 Display

all from bmsbattery

 

The site in question, nor any other site I have visited has mentioned needing a multimeter or soldering iron, when purchasing an e-bike kit I would have just got an e-bike to begin with, instead of converting my old bike.

 

Just looking at woosh bikes website, which another member kindly recommended I look at their bikes, I've just looked through their manual on e-bike kits and no mention of needing a soldering iron or multimeter, so why you say you should not get an e-bike kit without a multimeter, I don't understand, yes maybe after some usage I'd need one, particularly if I have a problem, like I said if the site said i need one, especially a soldering iron, i simply would of not got one

These sites are selling components for hobbyists. If you don't know about the stuff and how it goes together, you should be buying a ready-made plug and play kit from Woosh, YSPower, Dillenger or somewhere like that, whose kits have instructions and backup.

 

Your controller is not going to fit in the battery compartment because it's miles too big. You'll have to get a toolbag that goes under the saddle and stick it in there, then you'll have to run some 13g silicon wires to it from the back of the battery connector in that empty controller compartment. That means soldering to the terminals plus soldering connectors to the wires, which you'll have to get from somewhere. I'd recommend XT60s. You might also have to extend the PAS cable too.

 

Finally, you have to be very careful when fitting a 500w motor to the front forks. don't just bolt it up and expect it to work. getting it wrong can result in a serious accident (no bullsh¦t) so make sure you show photos and take advice from the forum when doing it.

 

Which exact motor did you get?

Edited July 18, 20205 yr by vfr400

These sites are selling components for hobbyists. If you don't know about the stuff and how it goes together, you should be buying a ready-made plug and play kit from Woosh, YSPower, Dillenger or somewhere like that, whose kits have instructions and backup.

 

Your controller is not going to fit in the battery compartment because it's miles too big. You'll have to get a toolbag that goes under the saddle and stick it in there, then you'll have to run some 13g silicon wires to it from the back of the battery connector in that empty controller compartment. That means soldering to the terminals plus soldering connectors to the wires, which you'll have to get from somewhere. I'd recommend XT60s. You might also have to extend the PAS cable too.

 

Finally, you have to be very careful when fitting a 500w motor to the front forks. don't just bolt it up and expect it to work. getting it wrong can result in a serious accident (no bullsh¦t) so make sure you show photos and take advice from the forum when doing it.

 

Which exact motor did you get?

 

The guy hasn't got a Scooby vfr he's got no chance of getting the kit working, he's in way over his head.

The guy hasn't got a Scooby vfr he's got no chance of getting the kit working, he's in way over his head.

It was you who recommended I bought the kit for one. Look its simple if the site had mentioned any of this I simply wouldn't of bought it. Even still the kit didn't come with any instructions what so ever. It isn't rocket science, though and it was simple to work out how to connect everything to the controller, everything except the battery However, for a start I don't have a soldering iron and I'm not prepared to go soldering something so expensive, if you've nothing construction to say then just move on, I was looking for a reason why the battery wouldn't switch on not, a condescending one, of a self styled so called guru, at that. You have an awful lot to say on almost every post I come across, suggesting you have way too much time on your hands. Look how useful the above person has been, without been condescending

These sites are selling components for hobbyists. If you don't know about the stuff and how it goes together, you should be buying a ready-made plug and play kit from Woosh, YSPower, Dillenger or somewhere like that, whose kits have instructions and backup.

 

Your controller is not going to fit in the battery compartment because it's miles too big. You'll have to get a toolbag that goes under the saddle and stick it in there, then you'll have to run some 13g silicon wires to it from the back of the battery connector in that empty controller compartment. That means soldering to the terminals plus soldering connectors to the wires, which you'll have to get from somewhere. I'd recommend XT60s. You might also have to extend the PAS cable too.

 

Finally, you have to be very careful when fitting a 500w motor to the front forks. don't just bolt it up and expect it to work. getting it wrong can result in a serious accident (no bullsh¦t) so make sure you show photos and take advice from the forum when doing it.

 

Which exact motor did you get?

 

Thank you have been very helpful, as you can imagine I had no idea, I'd need to solder anything as its not mentioned on the site in question nor did it have any instructions. It didnt even have the screws to connect the battery to the rack.

 

I got bafang bmp front hub 500w https://bmsbattery.com/ebike/584-16216-bafang-bpm2-48v500w-front-driving-e-bike-motor-wheel-ebike-kit.html#/213-rpm-201. The length of pas wire was sufficiently long and I got the measurements for the controller before it came and got a bike bag to fit it. I got 2 extra thick torque arms as it was going on the front wheel. I was going to use p clips to fit them but my local DIY ship didn't have any. Either way vfr, the battery should switch on so you can check it works. Before soldering. I appreciate your help, thank you

The battery might be switching on. How would you know it is or isn't. We always check that with a meter, which is essential equipment even if you buy a plug-and-play kit.

 

These are the things you're going to need to complete the installation:

 

Digital multimeter

60w soldering iron

40/60 tin lead solder (not the free stuff you get in soldering kits)

Assortment of heatshrink tube.

https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2334524.m570.l1313.TR6.TRC2.A0.H0.Xheatshrink+tube.TRS0&_nkw=heatshrink+tube&_sacat=0&LH_TitleDesc=0&_udhi=3&_osacat=0&_odkw=bottom+bracket+tool

 

The 500w BPM motor has immense torque, so it's axle can easily twist itself out of the forks. Correct installation is critical. You'll probably have to file your dropouts to get it in. I always file the drop-outs deeper as well to re-centralise the axle. I think that at 30amps, even with double torque arms, theres a strong possibility that it'll pop your drop-outs. I would only fit one with that much current in steel forks.

 

Which forks do you have.

The guy hasn't got a Scooby vfr he's got no chance of getting the kit working, he's in way over his head.

As long as they're willing to learn, I'm happy to pass on my wisdom. Its the ones that already know the answers that make me switch off.

The battery might be switching on. How would you know it is or isn't. We always check that with a meter, which is essential equipment even if you buy a plug-and-play kit.

 

These are the things you're going to need to complete the installation:

 

Digital multimeter

60w soldering iron

40/60 tin lead solder (not the free stuff you get in soldering kits)

Assortment of heatshrink tube.

https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2334524.m570.l1313.TR6.TRC2.A0.H0.Xheatshrink+tube.TRS0&_nkw=heatshrink+tube&_sacat=0&LH_TitleDesc=0&_udhi=3&_osacat=0&_odkw=bottom+bracket+tool

 

The 500w BPM motor has immense torque, so it's axle can easily twist itself out of the forks. Correct installation is critical. You'll probably have to file your dropouts to get it in. I always file the drop-outs deeper as well to re-centralise the axle. I think that at 30amps, even with double torque arms, theres a strong possibility that it'll pop your drop-outs. I would only fit one with that much current in steel forks.

 

Which forks do you have.

 

I would assume the rear light would switch on which is connected to the battery or the status lights at the front under the on/off switch, I did file the dropouts to get the wheel to fit and it fits perfectly. I could easily solder the controller wires and it doesnt work, they can then dispute I did something wrong in the soldering process. I appreciate all your help and feedback, but I will not be going ahead with this kit and will just buy an ebike, which in hindsight I should of done in the first place, but with the lockdown, there was no stock anywhere. Like ive said numerous times if the i was aware ie the website said all this, no way would I have bought the kit

It was you who recommended I bought the kit for one.

 

I/we recommend a lot of stuff, it's up to the individual to assess whether they have the know how to upgrade and fit the items.

One would have though that anyone looking at these kit/part vendors would notice that additional skills may be required to fit them.

They can be plug and play but only if the correct items are purchased.