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04-30-2019, 07:39 AM | #1 |
Not Yet Wild
Join Date: Feb 2019
Posts: 8
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Parallel Nissan Leaf Modules
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? |
04-30-2019, 07:59 AM | #2 |
Gone Wild
Join Date: Jul 2018
Location: Central Ohio
Posts: 1,720
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Re: Parallel Nissan Leaf Modules
You don't still have the modules that swelled hooked up do you?!?!
That ain't safe, even when not using the cart! Read through this thread:http://www.buggiesgonewild.com/lithi...-exploded.html To be clear, this was not a Leaf module battery pack, that caught fire. It was a Volt battery pack. However, in this thread good information is shared about lithium batteries, be it Leaf, Volt or others. Maybe give us some specs on your components and pictures of your setup. The gurus on here will be able to give you advice. Last edited by BBBHC; 04-30-2019 at 11:46 AM.. Reason: Added the part in red to clear up what battery pack caught fire |
04-30-2019, 08:09 AM | #3 | |
Gone Wild
Join Date: Sep 2014
Location: Orlando, FL
Posts: 1,308
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Re: Parallel Nissan Leaf Modules
Quote:
https://www.youtube.com/watch?v=Jz37WycW-7E A failed BMS and over charging can do this to them but no fire. See pic. |
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04-30-2019, 08:50 AM | #4 | |
Gone Wild
Join Date: Aug 2008
Location: Leander TX
Posts: 166
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Re: Parallel Nissan Leaf Modules
Quote:
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04-30-2019, 01:41 PM | #5 |
Getting Wild
Join Date: Nov 2018
Posts: 92
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Re: Parallel Nissan Leaf Modules
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04-30-2019, 01:56 PM | #6 |
Gone Wild
Join Date: Aug 2008
Location: Leander TX
Posts: 166
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Re: Parallel Nissan Leaf Modules
Well, like most dribble on the interweb it’s just a opinion. I just think it’s a safe precaution to physically observe voltage of the cells and/or have a few fail safes built in to make sure you don’t get over 4.2v. You know, spread a little faith.
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04-30-2019, 08:55 AM | #7 | |
Gone Wild
Join Date: Jul 2018
Location: Central Ohio
Posts: 1,720
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Re: Parallel Nissan Leaf Modules
Quote:
Maybe we need an additional "Stickey" that is titled differently so folks don't think anyone is trying to cause panic. I've recently finished a build with 14 Leaf modules. I certainly would not have done the build if I thought it could be dangerous with utilizing appropriate safety inputs. You have way more experience and knowledge than I have and I respect that, and you. With that being said. Would you not agree that any cells that have swelled, should not be used any further? |
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04-30-2019, 11:24 AM | #8 | |
Gone Wild
Join Date: Sep 2014
Location: Orlando, FL
Posts: 1,308
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Re: Parallel Nissan Leaf Modules
Quote:
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04-30-2019, 11:48 AM | #9 |
Gone Wild
Join Date: Jul 2018
Location: Central Ohio
Posts: 1,720
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Re: Parallel Nissan Leaf Modules
All good. I didn't mean to insinuate that it was Leaf pack. I should have been more clear about that. I went ahead and made an edit on the post.
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04-30-2019, 08:04 AM | #10 |
Gone Wild
Join Date: Sep 2014
Location: Orlando, FL
Posts: 1,308
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Re: Parallel Nissan Leaf Modules
Absolutely nothing wrong with the 5P2S configuration of your pack. Nick at EV Battery Center, who passed away over a year ago sold them assembled that way. My pack is 4 years old in that config and I have a 10 module pack in a cart for 3 1/2 years configured just like yours. There are many BGW users with the double configuration from Nick. The only issue with your pack may be that they sent you modules from two different mileage leaf packs. That could cause issues. When you are charging only to 4.08, I wouldn't expect a lot of mileage. You should be charging to about 4.16 and use a good BMS to prevent cell over voltage. The biggest problem with Tech Direct is that they do not disclose the AH of the modules being sold, only that they are at least 75% capacity. Nick tested all of what he sold and stated their AH and also priced them accordingly. I would gurss that most of what they sell are 55AH or less.
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