Charging Issue

Power wheelchair board for REAL info!

POWERCHAIR MENU! www.wheelchairdriver.com/powerchair-stuff.htm

Charging Issue

Postby cdb0ewm » 10 Jun 2018, 17:45

I have a 13s pack that I charge with the Hyperion EOS 1420i. Lately I've been having charging the pack. The 13th cell always lags in charging. I initially thought that the 13th cell was bad so I reconfigured the pack and made a different cell the 13th. I have the same issue. See the graph. Any suggestions on what's going on.]
Attachments
CHARGE.jpg
cdb0ewm
 
Posts: 156
Joined: 23 Jun 2013, 23:44

Re: Charging Issue

Postby Burgerman » 10 Jun 2018, 17:54

How many cells does your 13S pack have?

Is it 6 parallel?
If so you have have a bad cell in group 13. Not the 13th cell. ANY cell in group 13.

You will only find out by fully charging group 13, and seeing if it then behaves properly. After storing a week.
So charge that one GROUP of cells seperately, as its only at 3.2 something volts (almost discharged). Or with 300mA balance you will be waiting weeks for the hyperion to do it. Charge group 13 as A large single cell. And THEN balance by charging on the hyperion as a full battery. Only then test it. If faulty, then you need to test each celll in group 13.

If any single cell, in group 13 is bad it pulls all the rest down. Is this the pack that you rebuilt after someone else built it badly? Its possible that many cells are faulty due to being too low, or other issues.

You have to start with all groups full. If any single cell group is full, and the rest or just 1 Group is low, you may have say 72Ah to balance. At 300mA, That would take 230 hours. Or about 10 days...
User avatar
Burgerman
Site Admin
 
Posts: 65050
Joined: 27 May 2008, 21:24
Location: United Kingdom

Re: Charging Issue

Postby cdb0ewm » 10 Jun 2018, 19:31

ok I'll give it a try
cdb0ewm
 
Posts: 156
Joined: 23 Jun 2013, 23:44

Re: Charging Issue

Postby cdb0ewm » 12 Jun 2018, 21:08

OK - I have 13 groups of 6 cells. I isolated group 13 and it charged to 3.6 / 100% in less than 5 minutes. I also tried another 1420 charger and got the same results. Is it possible I have the balancing cables wrong? Here is how I did it. Any other suggestions. Thanks
Attachments
WC BALANCE 1.png
cdb0ewm
 
Posts: 156
Joined: 23 Jun 2013, 23:44

Re: Charging Issue

Postby Burgerman » 12 Jun 2018, 22:42

Looks correct. Charge every group as 1 big cell, and then charge as a pack. Test each group with a volt meter.
User avatar
Burgerman
Site Admin
 
Posts: 65050
Joined: 27 May 2008, 21:24
Location: United Kingdom

Re: Charging Issue

Postby cdb0ewm » 09 Oct 2018, 00:31

Unfortunately I haven't been able to work on the battery pack for a few months. When I tried charging the pack yesterday the overall voltage was 1.68v =- ugh.Obviously the charger wouldn't start. I'm not sure what happened or where to go from here. Should I take the pack apart and try to charge individual cells? Is there anyway to tell if a cell is doa and just be replaced?
Thanks
cdb0ewm
 
Posts: 156
Joined: 23 Jun 2013, 23:44

Re: Charging Issue

Postby Burgerman » 09 Oct 2018, 02:54

Complete strip. Any cell under say 2.5V bin.

All the rest need very careful testing. For Capacity, self discharge rates, etc. Before even thinking of reuse. If your statement of total voltage of under 2 volts is correct, then the lot are ruined.
User avatar
Burgerman
Site Admin
 
Posts: 65050
Joined: 27 May 2008, 21:24
Location: United Kingdom


Return to Everything Powerchair

Who is online

Users browsing this forum: No registered users and 208 guests

 

  eXTReMe Tracker