SolexxX said:
I have been reading the FAQ on the Batrium site and believe that my 160p X 14s configuration may not balance in a reasonable time frame.
1) I'm gonna guess you mean you have 14 packs of 160p connected in series. This is 14s160p
2) What do you mean by reasonable amount of time? Minutes, hours, days? You can increase the effectiveness of balancing by adding more longmons to a pack. So you could have 28 longmons (2 per pack) and it would work just fine.
Also, if you are needing to keep your packs in balance that constantly where you need to burn off 100's of watts with every charge, there's something wrong with 1 or more of your packs. After the initial balance, the work needed to keep them in balance should be minimal.
SolexxX said:
My new plan is to build the 160p packs electrically split into 2 X80p packs each with their own positive, negative and longmon. Just really 2X80p packs with the holders stacked. I wanted larger blocks so they are more compact. The downside is that I will have to swap out a 160 cell block (2 X80p) if I get a bad 80p cell. The other obvious downside is that I will need 2 longmons instead of one per 160 cells. Another problem is that at present I have 3400 cells so I will have to get another 1100 cells to complete the 28 X 160 blocks. I will also thenneed 56 longmons and that will add a bunch of cost.
You could use 2 longmons, yes. But electrically you could use just 1. Every pack that is connected in parallel could all use the same longmon. Again, stated above if your packs are balanced, then continued balancing would be at a minimum.
SolexxX said:
My question are:
What is the maximum number of cells (Xp) that you would use per lomgmon and why?
Is 80p 14s 4p going to cause any problems that I am not aware of?
Do you think 2 X 8 AWG copper wire (wound) is big enough for my cell busbars?
A) The number is basically unlimited. The greater number of cells comes a harder time balancing. However, if the packs are balanced, then this shouldn't be a big problem. (ad nauseam from repetition, I know)
B) It shouldn't cause any issues overall. Electrically, you should be fine. There are several people who do this. However, if you have multiple chemistries, then each chemistry needs to have it's own BMS. Don't mix LiFe banks with LiIon banks. They have different characteristics.
C) 2x8awg is fine. Most people use this size that use the twisted copper wire method.