Bazzar
New Member
I know its been said before but cleaning your terminals can make a world of difference.
I've been testing my 12v 4s 272ah Lishen pack and I had one cell that always was running 0.020-0.035v above or below @60A depending on if I'm discharging or charging. Now I had cleaned my terminals with a green scotch bright before I top balanced them a few weeks ago but had to wait about 2 weeks for my BMS due to backorder.
I got the BMS hooked everything up and started testing. Got the results above and also noticed that the terminal on that cell wat getting just slightly warmer then the rest of the connections 3-4f hotter after 30min at 90A. Finally took that bar off tonight re sanded everything and cleaned with cotton swab and alcohol reassembled and now I'm getting 0.001-2 difference @60A and 0.003-5 @ 125A much better.
I'm now waiting on my other order of 4 cells to double up my capacity and hope I get the same quality cells. Supposedly the supplier also upgraded the busbars between my orders so i had them add a set of the "upgraded" bars to put on the first pack since the forgot my double bus bars on the first order.
Anyways sorry for the long rant there but I hope this shows how important clean terminals can be.... even though I cleaned them 2 weeks before one must not have got as clean or got contaminated in 2 weeks and made me think I had a slight runner.
I've been testing my 12v 4s 272ah Lishen pack and I had one cell that always was running 0.020-0.035v above or below @60A depending on if I'm discharging or charging. Now I had cleaned my terminals with a green scotch bright before I top balanced them a few weeks ago but had to wait about 2 weeks for my BMS due to backorder.
I got the BMS hooked everything up and started testing. Got the results above and also noticed that the terminal on that cell wat getting just slightly warmer then the rest of the connections 3-4f hotter after 30min at 90A. Finally took that bar off tonight re sanded everything and cleaned with cotton swab and alcohol reassembled and now I'm getting 0.001-2 difference @60A and 0.003-5 @ 125A much better.
I'm now waiting on my other order of 4 cells to double up my capacity and hope I get the same quality cells. Supposedly the supplier also upgraded the busbars between my orders so i had them add a set of the "upgraded" bars to put on the first pack since the forgot my double bus bars on the first order.
Anyways sorry for the long rant there but I hope this shows how important clean terminals can be.... even though I cleaned them 2 weeks before one must not have got as clean or got contaminated in 2 weeks and made me think I had a slight runner.