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Unread 08-08-2019, 10:58 AM   #81
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Default Re: DIY 101 - 14 cell Nissan Leaf lithium pack

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Originally Posted by Keith93611 View Post
Great info! Thanks~ Question, after reading the thread and lookig at then wiring and schematic it appears that the BMS is only being used for Charging and monitoring, is this correct?
Thanks~
It's used to protect the battery pack from high voltage and low voltage situations, temp monitoring and provide cell balancing and monitoring. It also will disconnect the battery pack in the event that there is an issue via the Gigavac.

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Unread 09-06-2019, 04:49 PM   #82
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Default Re: DIY 101 - 14 cell Nissan Leaf lithium pack

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The holes in the modules are 8mm. Understand that the all fjread will no be bearing weight from the side it is only used to hold the modules snugly together. You can order 8mm allthread or get it from Fastenal or use 5/16" or 1/4". The 1/4" was a little loose for me so I used 5/16" from Lowe's and I had to finesse it a couple of times but they were still all stacked in a couple of minutes. Some people have had problems using 5/16" allthread. Your call.

I added final dimensions.

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do you by chance have a wiring schematics for the BMS and Leaf 7 cell?
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Unread 09-06-2019, 04:54 PM   #83
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Default Re: DIY 101 - 14 cell Nissan Leaf lithium pack

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Unread 09-06-2019, 10:11 PM   #84
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Default Re: DIY 101 - 14 cell Nissan Leaf lithium pack

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do you by chance have a wiring schematics for the BMS and Leaf 7 cell?
What specific components are you putting together?

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Unread 10-03-2019, 09:25 PM   #85
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Default Re: DIY 101 - 14 cell Nissan Leaf lithium pack

Someone please check me on this.

I've used the Gigavac on my first two packs because it was known to work (easy button) and reliable, but darned expensive!

I've been planning to look into feasibility of using our beloved, $70-80, MZJ 400 (main solenoid) as a more affordable option for our HV/LV disconnect... which BTW is sold by most of the BGW site sponsors.

Looking at the spec sheet it seems like it would work. Is there any reason the EE's or Guru's know of why this would not work?

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Unread 10-03-2019, 10:08 PM   #86
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Default Re: DIY 101 - 14 cell Nissan Leaf lithium pack

Curious about differences between 004 and 013 models of 48 volt one. I use a BMS that can put out only 250mA and wouldn't be able to drive 004 directly, but looks like 013 would work. Will need to research :)
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Unread 10-03-2019, 10:26 PM   #87
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Default Re: DIY 101 - 14 cell Nissan Leaf lithium pack

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Curious about differences between 004 and 013 models of 48 volt one. I use a BMS that can put out only 250mA and wouldn't be able to drive 004 directly, but looks like 013 would work. Will need to research :)
Which BMS?

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Unread 10-04-2019, 02:10 AM   #88
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Default Re: DIY 101 - 14 cell Nissan Leaf lithium pack

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Which BMS?

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TinyBMS. I currently have a power transistor hooked up in the middle to drive MZJ200A (or similar clone), which takes about 350mA.
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Unread 10-05-2019, 01:40 AM   #89
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Default Re: DIY 101 - 14 cell Nissan Leaf lithium pack

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Originally Posted by MCJEFE View Post
Someone please check me on this.

I've used the Gigavac on my first two packs because it was known to work (easy button) and reliable, but darned expensive!

I've been planning to look into feasibility of using our beloved, $70-80, MZJ 400 (main solenoid) as a more affordable option for our HV/LV disconnect... which BTW is sold by most of the BGW site sponsors.

Looking at the spec sheet it seems like it would work. Is there any reason the EE's or Guru's know of why this would not work?

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Here's an update for anyone who is putting together a parts list for a build. I emailed Ian at Zeva about using the MJZ 400 solenoid as the HV/LV disconnect instead of the Gigavac GV241.

Here's what he said:

"It looks like that solenoid / contactor should work fine with the BMS16. Coil current should be much less than the 2A continuous limit of the BMS’s output relays. You might need to add a flyback diode or transorb across the coil to suppress inductive voltage spike when the contactor opens though. (Large enough voltage spikes can harm SSRs.)"

He mentioned that he may get on BGW to provide assistance for his BMS's. It'll be a nice resource if he does.

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Unread 10-05-2019, 08:13 AM   #90
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Default Re: DIY 101 - 14 cell Nissan Leaf lithium pack

That would be nice if he does.

I mentioned to him a year ago a lot of us on here were using his components and if he had the time he should drop in to check out our projects.
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