ZEVA BMS24 System
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ZEVA BMS24 System
Awhile back I made a bunch of BMS24 units for a project that has to monitor a ton of parallel groups. I ended up selling the battery pack and dropped it to 96 cells so I have a ton of extra BMS units left over. Since they are based on the hard-to-find LTC6802 IC I hand-calibrated and assembled them using a fluke as a reference. Different die revisions of the LTC BMS ic cause slight drifts to the voltage sense stored in registers! I don't have thermistors to test the temp sensing but I assume that it would work perfectly with the recommended sensors as per the user manual as I didn't change anything about that side of the board.
I 3D printed the enclosures using high temp ABS
I conformal coated the LTC ic to keep ingress from shorting the tiny leads together but these are NOT waterproof!
Even though I calibrated and tested every single unit. due to the safety nature of a BMS its UP TO THE USER to properly install the unit - for this reason, I can't provide any sort of warranty or support
I changed the layout and schematics to use parts that are easier/possible to source but the functionality is the exact same.
I have a total of 20x units for sale. If you are interested in more than a few (4 units) I would be happy to entertain offers.
They come with the terminal-style connectors shown in the pictures
Looking for $250 each BMS24 Unit.
I am still working on sourcing parts for EVMS V3s but I plan on selling some later.
I 3D printed the enclosures using high temp ABS
I conformal coated the LTC ic to keep ingress from shorting the tiny leads together but these are NOT waterproof!
Even though I calibrated and tested every single unit. due to the safety nature of a BMS its UP TO THE USER to properly install the unit - for this reason, I can't provide any sort of warranty or support
I changed the layout and schematics to use parts that are easier/possible to source but the functionality is the exact same.
I have a total of 20x units for sale. If you are interested in more than a few (4 units) I would be happy to entertain offers.
They come with the terminal-style connectors shown in the pictures
Looking for $250 each BMS24 Unit.
I am still working on sourcing parts for EVMS V3s but I plan on selling some later.
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Re: ZEVA BMS24 System
Have you or are you going to create the Zeva current sensors?
I have bought the Zeva system for my car to install once I get to that stage, so I am very glad you have created these items
I have bought the Zeva system for my car to install once I get to that stage, so I am very glad you have created these items
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Re: ZEVA BMS24 System
Yes, I will. These require a complete redesign since the current sensor used is extremely old and very difficult to buy in any sort of quantity. I understand the CAN protocol pretty well so it shouldn't be too much work but since I don't need one for myself I haven't spearheaded the project unless there is interest in others for me to sell them.
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Re: ZEVA BMS24 System
KimchiKimKim, I love the overall design of these boards, (thank you Ian Hooper). But I have never been keen on the terminal connector with the screws only a mm away from each other. A potential short circuit could occur. Do you know of a different connector to the black ones that have say crimped ones so that there is more plastic insulation between wires?
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Re: ZEVA BMS24 System
The best way to fix concerns like that is simply with a wire ferrule crimp. I was going to replace them with some crimpable TE superseal connectors, but wiring this way is so much easier.johnspark wrote: ↑Thu Feb 02, 2023 8:42 pm KimchiKimKim, I love the overall design of these boards, (thank you Ian Hooper). But I have never been keen on the terminal connector with the screws only a mm away from each other. A potential short circuit could occur. Do you know of a different connector to the black ones that have say crimped ones so that there is more plastic insulation between wires?
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Re: ZEVA BMS24 System
Ah do you mean bootlace ferrules? that fixes stray wire strands, there would still be the issue of the screws 1mm apart. Crimpable TE superseal connectors sounds interesting. I would be happy to pay more for it.
Kind regards.
Kind regards.
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Re: ZEVA BMS24 System
So for my first car I only need those 3 current BMS modules so probably not enough for these superseal connectors...
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Re: ZEVA BMS24 System
So for my first car I only need those 3 current BMS modules so probably not enough incentive for you to invest in these superseal connectors...
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Re: ZEVA BMS24 System
Hi! Messaged you on eBay.
Just curious, will these work with the ZEVA BMS directly or do they need reflashing? It’s for expanding a battery system currently equipped with the V2 system (but I think they allow reflashing to V3) I would need 7 units. I will be doubling the 10 battery modules to 20 but I actually have 14 extra modules so there is some wiggle room for me. Thank you
Just curious, will these work with the ZEVA BMS directly or do they need reflashing? It’s for expanding a battery system currently equipped with the V2 system (but I think they allow reflashing to V3) I would need 7 units. I will be doubling the 10 battery modules to 20 but I actually have 14 extra modules so there is some wiggle room for me. Thank you
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Re: ZEVA BMS24 System
Hello! These are ready to work in stock EVMS V3 but I'm pretty sure that V2 system use a different CAN bus protocol so I cannot confirm.Tito wrote: ↑Thu Apr 18, 2024 5:28 pm Hi! Messaged you on eBay.
Just curious, will these work with the ZEVA BMS directly or do they need reflashing? It’s for expanding a battery system currently equipped with the V2 system (but I think they allow reflashing to V3) I would need 7 units. I will be doubling the 10 battery modules to 20 but I actually have 14 extra modules so there is some wiggle room for me. Thank you
Re: ZEVA BMS24 System
Ok. I know about the different protocol but I'm positive the EVMS can be reflashed to V3. If not I'll source a V3 or have one made as they are open source now. But i'll take care of that.
Can you do a good deal for me with shipping 7 of them to the Netherlands?
Can you do a good deal for me with shipping 7 of them to the Netherlands?
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Re: ZEVA BMS24 System
Private messagedTito wrote: ↑Fri Apr 19, 2024 10:28 am Ok. I know about the different protocol but I'm positive the EVMS can be reflashed to V3. If not I'll source a V3 or have one made as they are open source now. But i'll take care of that.
Can you do a good deal for me with shipping 7 of them to the Netherlands?