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Old 06-05-2019, 07:31 AM   #2
BBBHC
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Join Date: Jul 2018
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Default Re: Please review my buy list for lithium build

Quote:
Originally Posted by somfas View Post
I just purchased 10 Leaf modules for a 72v conversion. I have been in touch with Ian to purchase a Zeva BMS. I plan to purchase:

1) EVM53 which should work (2x12 cell)??
2) Optionally some kind of CAN current sensor (no clue, but would like it to be done right)
3) 72V-12V step down converter (will take out my 12v accessory battery)
4) Optional EVMS Monitor
5) TC Charger (HK-H-H99-25 recommended but sold out from Aliexpress)

Assuming I can figure a way to assemble to batteries and for a collective batter pack, is there any other items I would need in addition to whats mentioned above? Thoughts on using plywood or metal for end plates to sandwich the plates together? How tight should I squeeze them?

Thanks!
Well I'm no expert, did just finish up a 14 leaf module pack for 58v setup. Mainly I want to follow this thread for a possible future build... Here are my thoughts, I'm sure the gurus will chime in...

I won't comment on the ones I don't know about
4) I would definitely get one. The question is, do you want a dash mount or panel mount.
5) Get in touch with DaveTM. He went through a bit of a dilemma with his and can give you advice on how to order it to make sure it is set up correctly for you.

Unless it is built into the EVM53 you will need a shunt or hall effect sensor. I don't believe it is built into the EVM53, but don't know for sure, it's not built into the EVMS that I have. From what I have seen the only real benefit to use hall effect over shunt, is less cables... (again, wait for the gurus to confirm)

You will want to have a LV/HV cutoff of some sort, assuming that the EVM53 does not do this by way of software. You can either go with a contactor or relays. Zeva does sell contactors, you can also buy them directly from a manufacturer. The use of contactor from all of the builds I have seen is more expensive than relays, but easier to wire in my opinion. I went with a contactor.

I would not use plywood. As to how tight to compress them, there is not a set amount that I have come across. Did the batteries you ordered come with the side plates? I used 5/16" allthread and just tightened until "it felt right". If you got the 2nd gen modules, they have metal sleeves where the allthread goes through, you really can't overtighten them. I don't think the 1st gen modules have the metal sleeves, I don't know about the 3rd gen modules.

Hope this helps. I'll be following along and offer what advice I can as well as learning about the higher voltage setup.
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