Marty Backe

My ACM V2s+ Won't Charge

23 posts in this topic

After putting my ACM back together and riding it for about 25 miles, the battery level was down to ~40%. I put it on the charger and it started charging. Sometime within an hour I walked by and noticed that it had stopped charging, but the battery was maybe 45%.

Guess I'll be opening the wheel, but the battery connectors seemed pretty straight forward when I reconnected everything before buttoning the wheel up. Any suggestions on what I should look for?

Thanks in advance.

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Charger voltage, battery in and out voltage.

you have a second charger?

 

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40 minutes ago, Chriull said:

Charger voltage, battery in and out voltage.

you have a second charger?

 

I have multiple chargers. They all indicate a full charge. I believe the wheel has the correct charge (~45%) because it's consistent with the number of miles ridden on the last charge.

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27 minutes ago, KingSong69 said:

I would at first measure each Batterie pack...

Then, when you have open the wheel, disconnect one of the Batterie packs completly, all Charge, discharge, and Balance wires, and try to load each of the packs seperatly.

Perhaps with this method you can eleminate a defective BMS/Batterie pack...

When connecting back the 2 packs be sure, they are at the same voltage!

Thanks. Unfortunately I don't think I understand or know how to do any of what you suggest.

When I last rode the wheel about a month ago it was charging normally. A BMS/Battery pack can go bad so quickly?

When I rebuilt my wheel I connected the two battery packs together and then connected to the board. I really didn't give any of this special thought. Just plugged everything together.

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1 minute ago, Chriull said:

The connections to the mb seem to be ok, since you could ride. Chances are quite high that the charger(s) are ok, too.

so since you can't charge either the charging connection, the balancing wires are one/both BMS are messed up...

bms input (charge) protection should normaly reset once the charger is plugged in.

so after double, triple checking these wires and contacts you could disconnect the batteries and then just connect one battery pack, try to charge it and then you try to connect just the other one and try to charge it.

could be that one has a defective BMS or severe unbalanced cells and by this hinders charging of both packs?

wasn't there some voltage difference prob already once you reassembled the packs?

Thanks much for the tips. Since all the batteries (two in the ACM) are connected in parallel I don't see how I could have made a mistake there, but maybe with those other bms connectors.

I'm nervous with the sequence of connecting/disconnecting the batteries - I don't want to blow up anything like @Rehab1 may have done. Maybe I'll post a couple of pictures as-is before I disconnect anything, for additional advice.

Thanks guys.

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5 hours ago, Marty Backe said:

After putting my ACM back together and riding it for about 25 miles, the battery level was down to ~40%. I put it on the charger and it started charging. Sometime within an hour I walked by and noticed that it had stopped charging, but the battery was maybe 45%.

Guess I'll be opening the wheel, but the battery connectors seemed pretty straight forward when I reconnected everything before buttoning the wheel up. Any suggestions on what I should look for?

Thanks in advance.

Marty I have full faith you reassembled everything correctly. I know you made some modifications to the length of the motor cables but that should not be the issue. ? Scratching my head. 

As @KingSong69 and @Chriull mentioned check the voltage of each pack once everything is disconnected.

Were there any other burnt wires that you replaced? Does the mainboard and battery pack power XL60 connector electrode pins show any signs of erosion? Even though there is a small arc each time you reconnect the XL 60's there is a tendency over time to erode the terminals. 

How are your solder connections where you spliced in the new wires. You may want to perform a resistance check at these sites. You are the only one that I am aware of that increased the length of the motor wires.

2 hours ago, Marty Backe said:

I'm nervous with the sequence of connecting/disconnecting the batteries - I don't want to blow up anything like @Rehab1 may have done. Maybe I'll post a couple of pictures as-is before I disconnect anything, for additional advice.

Just remember to reconnect the mainboard board XL60 connector Last in the sequence.  I also like to discharge the MB capacitors first by depressing the ACM power switch.

Being that you do not have the spark arrestor connector be sure to be deliberate when pushing the XL60 connectors together! Do not hesitate or the arcing will eventually cook the connector's electrodes.

When I look back I see why people are scared but remember my event was unique. If your worried just wear some cloth gloves. 0aPWoKE.jpg

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38 minutes ago, Chriull said:

Without a spark artestor connector i would not discharge the mb capacitor.

Plus One!!! No discharging of the capacitor's!

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BTW, all of my wiring and solder connections look perfect. And I did some good uphill and high temperature riding with @Sven the evening after I reassembled my ACM, to test things out. Andy will be publishing a video from that ride.

So I'm really feeling good about my wiring harness surgery :thumbup: :D

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Glad to hear that you were able to find the source of the problem.  It's aggravating to encounter all the little weaknesses in these wheels, but taking the can-do DIY attitude I think you gain invaluable experience.  This might be a good opportunity to swap to heavier gauge charging wires if you see fit.

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5 minutes ago, Hunka Hunka Burning Love said:

Glad to hear that you were able to find the source of the problem.  It's aggravating to encounter all the little weaknesses in these wheels, but taking the can-do DIY attitude I think you gain invaluable experience.  This might be a good opportunity to swap to heavier gauge charging wires if you see fit.

If nothing else, I may try charging at 5 amps and empirically determine if the wires are getting too hot.

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1 minute ago, Marty Backe said:

If nothing else, I may try charging at 5 amps and empirically determine if the wires are getting too hot.

"Empirically" as in placing a small marshmallow on the charging cables to see if there is a fine roast that occurs?  :popcorn:

tmice-3.jpg

 

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2 minutes ago, Hunka Hunka Burning Love said:

"Empirically" as in placing a small marshmallow on the charging cables to see if there is a fine roast that occurs?  :popcorn:

tmice-3.jpg

 

Hey, I was wondering how to measure it, but I think you stumbled on the perfect solution :thumbup:

:laughbounce2:

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1 hour ago, Marty Backe said:

Damn. So now I get to remove the whole shell again (hopefully just the non-control board side) so that I can get full access to that charge port and see what exactly failed. :crying: I wonder if pushing 4 amps through it with the EWheels Fast Charger made a crappy solder connection worse? Hmmm. I'll find out tonight.

Glad you are making progress! It will be interesting to hear what you find out. Taking a picture in that area is tough but please try. 

On a positive note you'll soon be able to do this blindfolded. 

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14 minutes ago, Rehab1 said:

Glad you are making progress! It will be interesting to hear what you find out. Taking a picture in that area is tough but please try. 

On a positive note you'll soon be able to do this blindfolded. 

Unfortunately I think you're right :(

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9 hours ago, Marty Backe said:

Unfortunately I think you're right :(

Remember,working with EUC batteries is fun!:cheers:

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