Parallel Nissan Leaf Modules

[rjz]

Hi Everyone,

I completed a conversion about a month ago and have been having very weak performance. I am thinking I get maybe 3 miles on 10 module battery (36v) which is less then my lead acid on their death bed. It seems from what I have read that the batteries must have been very heavily used. I used a bms to monitor and have kept them within safe ranges (2.85-4.08, though pack voltage was 30-40.5 so they really should have never been close to the extremes). I probably have only cycled the batteries 5 times since I have been trying to troubleshoot the weak performance. I contacted the vendor (techdirect) when 3 of modules began to swell. I think I received bad batteries. The vendor is indicating the issue is my pack configuration. I have my modules in one set, with every 2 modules paralleled. The vendor indicated that format is not safe and that I should assemble two 5 packs and hook them up in parallel. This seems to me more likely to cause balancing issues and I am unclear why it would be necessary. Can someone let me know if they are correct or if I am overlooking something?