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Post by vmrod on Nov 30, 2010 14:55:45 GMT -3
The second set of batteries came in, and were installed a couple weeks ago.
The batteries are very impressive, and dish out alot of power.
I still have a couple more pairs to purchase and install, but that will come next year.
I'm also hoping on installing an active over-voltage relay (to shutoff the charger automatically), and also a low voltage warning indicator relay, so I can see the warning from the thingypit.
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Post by vmrod on Mar 31, 2011 11:21:28 GMT -3
The second set of batteries seemed to develop a group that was a little higher in voltage than the other groups. This means they reach max voltage before the other groups. If left unwatched, this could lead to cell failure.
The first set of batts seems to have a single cell that is giving a high cell voltage. I have swapped things around, and it is hard to pinpoint the cell each time. I'll spend a wee more time trying to locate this high voltage cell, and go from there.
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Post by vmrod on Jun 16, 2011 14:46:44 GMT -3
Well, I notified the factory about the problem, but was never given a solution to the problem. I figured that if the battery is giving me problems right now, then I would either want an exchange or a refund. I am offered neither.
At this moment in time, the VMS inside Lifetech batteries only balances 4 cells as a group. The other groups do not balance with each other.
I was told that a new BMS would be offered soon, which provides cell to cell balancing. Sounds good! However, I thought the battery I bought was supposed to stay balanced. I guess I need to pay more to have it really balance this time.
In the near future, I will need a battery system for both my trike and the Opel. The system needs a BMS that functions like a BMS should.
I'm not so sure I'll be using Lifetech now. Maybe just the cells, but we will have to see.
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Post by drrighteous on Apr 2, 2012 23:03:33 GMT -3
BMS = Battery Murdering System. Disable it, bottom balance the cells and use an intelligent charger to slightly undercharge the pack. This plus avoiding more than 80% DoD should make the pack last a long time.
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Post by vmrod on Apr 4, 2012 19:19:10 GMT -3
I think a complete BMS system is good to have.
What I have is a partial cell balancer, which balances 4 cells nicely, but when placed in a string of other groups....eventually the groups of 4 become unbalanced.
I just use this as my test pack for EV projects, and will get a better system soon.
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