Cheap BMS?

[my.motion]

Hi Team,
where can i find cheap BMS for 48v 15Ah battery to replacemy existing? is this easy to connect? is BMS easy to fix?

Please share any info or experience/advise you may have in handling/connecting/dealings with BMS

thnx

 

[ycul101]

48 volt 15 amp Battery BMS

Hi My motion,

Can you advise what happened to your BMS it wouldn't have overheated it would it?
As for where to buy a bms from try ep batteries on ebay I have purchased one from them. Just drop them an email and ask they will ask for a photo of your current BMS so they can try to identify who sold the battery. They are very helpful.

 

[my.motion]

Bms

Thanks, I will check out the seller later today, my BMS arrived dead?, according to some experts on here http://www.pedelecs.co.uk/forum/electric-bicycles/4519-battery-controller-fault.html
my battery is not accepting any load, it shutsdown when a controller is connected.

 

[my.motion]

The battery is lithium Ion and not Lifepo4. As soon as it first arrived i charged it for 24hrs then tried to use it, unfortunately it wouldn't work. We are suspecting that the BMS is faulty. Should the reading be 49.9v for lithium ion or should i expect more?

 

[aaannndddyyy]

The battery is lithium Ion and not Lifepo4. As soon as it first arrived i charged it for 24hrs then tried to use it, unfortunately it wouldn't work. We are suspecting that the BMS is faulty. Should the reading be 49.9v for lithium ion or should i expect more?

See one of your priveous posts on this kit.

if its a 48volt lipo battery it should read around 58-60volts hot off the charger.

You seem to be going around in circles.
Its difficult to keep track of what you have done so far as there are now three threads started on the same problem.

Have you emailed the vender you perchest the kit from as it is new.
Have you tried running the motor controller with another 48volt power source,
If you can connect your 36 volt battery (you have a Milan battery I think) with a 12 volt battery in series then try and see if the kit works, if it dose then you will no to look at the battery, bms, or charger.
Have you tested the charger with your meter to see its output voltage, it should be around 61 volts.

 

[my.motion]

You seem to be going around in circles.
Its difficult to keep track of what you have done so far as there are now three threads started on the same problem.

Apologies, i had conluded the BMS was faulty thats why I started a new thread about BMS. I thought this will make it easy for someone with BMS experience to comment rather than read through my other long thread. Again sorry to complecate things.

Have you emailed the vender you perchest the kit from as it is new.

Yes, it is quite expensive to return things to vendor in china. So I am trying to fix it myself before I spend more returning the kit. I have set the ball rolling to return the battery but need to make sure all other components are fine

Have you tried running the motor controller with another 48volt power source,
If you can connect your 36 volt battery (you have a Milan battery I think) with a 12 volt battery in series then try and see if the kit works, if it dose then you will no to look at the battery, bms, or charger.
Have you tested the charger with your meter to see its output voltage, it should be around 61 volts.

I don't have a 12volt battery, but when I use the milan battery 37v the kit does detect power on the thumbthrottle (red lights on empty) but i think not enough power to run the motor. Even when I operate the throttle the power doesnot cutoff with the sla battery(although not enough to run the motor) Will a 12v ac/dc adptor (300mA) work? How will I connect the two to get 48v please? The charger output voltage is 54.5. Since last night i left my battery to charge and the volts gone upto 50v now. Maybe I need to charge the battery for 1 week until it goes to 58-60v? Will the battery not work at 49.9v? the battery specs can be found here, is this a lipo battery or just lithium ion apologies for my ignorance 1000W Hub Motor+48V 12AH Lithium Ion Electric Bike kit on eBay.ca (item 390077459822 end time 04-Aug-09 10:14:19 EDT)

Again thanks for your help and apologies for my mistakes

 

[Fecn]

Yes, it is quite expensive to return things to vendor in china.

It's not so expensive if you use SeaMail for shipping back faulty goods. The downside of course is that it can take up to 8 weeks for them to arrive back with the vendor as they stick all the post in a shipping container and send it on a slow-boat-to-china. However, most vendors aren't in a rush to get faulty items back and will ship new ones to you before the faulty ones arrive back. I sent back a faulty battery charger a couple of weeks ago. The parcel weighed 0.5kg and the cost was £3.10

 

[my.motion]

thanks fecn, I will checkout seamail when am ready to send the battery back

 

[my.motion]

using battery to test when connected to mains

Hi all,

Is it ok to test the conversion kit when the battery is connected to the mains charging?

Thanks

motion

 

[my.motion]

All sorted, was a loose BMS cable connection thany you all

 

[Straylight]

Nice one! How did you track it down in the end?

 

[my.motion]

There was an opening in the battery case, I looked through with a torch and was able to see a loose wire connection.