Zeva confusion....

Steve390Gold · 01-18-2019, 11:30 PM

Ok my FLA batteries are on the way out. I cant stand the things anyhow....

Im going to run a "72v" setup utilizing 10 nissan leaf battery modules (20 cells.) To that end a pair of Zeva's 12-cell Lithium BMS Module V3 should each handle 10 cells without issue.

Now my confusion falls on what else is needed.

Can i juat run a single EVMS Monitor V3 and be done with it, or MUST i also run a Electric Vehicle Management System V3?

I really dont want the EVMS if i can avoid it....and will such a setup without the EVMS be capable of shutting off a charger?

DaveTM · 01-19-2019, 09:19 AM

From what I see, the EVMS appears to be for high voltage setups. The documentation shows their example of a pack voltage of 148-V. Way more than the 57-V BMS that I'm running.

The ZEVA 12 cell BMS states the maximum voltage is 60-V. Now, I'm not quite sure of the setup using this for a 72-V system.

This post may not be much of a help in answering your question.....more of a "Hmmmm" how you gonna do that?

FWIW

Sergio · 01-19-2019, 10:58 AM

Quote:

Originally Posted by Steve390Gold

Ok my FLA batteries are on the way out. I cant stand the things anyhow....

Im going to run a "72v" setup utilizing 10 nissan leaf battery modules (20 cells.) To that end a pair of Zeva's 12-cell Lithium BMS Module V3 should each handle 10 cells without issue.

Now my confusion falls on what else is needed.

Can i juat run a single EVMS Monitor V3 and be done with it, or MUST i also run a Electric Vehicle Management System V3?

I really dont want the EVMS if i can avoid it....and will such a setup without the EVMS be capable of shutting off a charger?

You can use a single EVMS Monitor V3 to configure both 12-cell Lithium BMS Module V3, but You will need an MCU like the EVMS to handle the LV and HV circuit.

The 12-cell Lithium BMS can will handle the balancing and monitoring of the cells by itself, but if a LV or HV cell condition is encountered, it only communicates that information by CAN data to the MCU which is the one that has the Solid state relay interface and also knows how to talk to the charger using CAN commands.

Steve390Gold · 01-21-2019, 11:13 AM

Quote:

Originally Posted by Sergio

You can use a single EVMS Monitor V3 to configure both 12-cell Lithium BMS Module V3, but You will need an MCU like the EVMS to handle the LV and HV circuit.

The 12-cell Lithium BMS can will handle the balancing and monitoring of the cells by itself, but if a LV or HV cell condition is encountered, it only communicates that information by CAN data to the MCU which is the one that has the Solid state relay interface and also knows how to talk to the charger using CAN commands.

So for the system to turn off the charger i need the MCU and a pair of 12cell BMSs. Tossing in a charger and im north of 700 before ever even buying lithium cells....that is way way way too much money for a simple bms / charging setup.....

Sergio · 01-21-2019, 12:30 PM

That is actually pretty cheap for automotive grade BMS, but it is likely overkill for a Golf cart system.

E36Racer · 01-21-2019, 12:54 PM

I think your best bet is to contact Ian at Zeva on this one. You may need to go with his older setup that I have, EVMS Lite V2 with two of the BMS 12 modules. But I’m not positive, I guess there is the possibility you can add one of the 12 cell modules to the BMS16 via CAN. Ian will give you the best setup for your needs.

DaveTM · 01-21-2019, 03:45 PM

Quote:

Originally Posted by Steve390Gold

So for the system to turn off the charger i need the MCU and a pair of 12cell BMSs. Tossing in a charger and im north of 700 before ever even buying lithium cells....that is way way way too much money for a simple bms / charging setup.....

I dunno......pick up 14 modules for $85 a piece. That's $1,200.

So....for $2,000 you have a low maintenance lithium set up with gobs and gobs of run time.

E36Racer · 01-21-2019, 04:28 PM

Quote:

Originally Posted by Steve390Gold

So for the system to turn off the charger i need the MCU and a pair of 12cell BMSs. Tossing in a charger and im north of 700 before ever even buying lithium cells....that is way way way too much money for a simple bms / charging setup.....

Don’t forget the prices on the Zeva website are AU$. So you need to multiply them by $0.72 to convert to USD based on today’s exchange rate.

bronsonj · 01-24-2019, 07:35 PM

Quote:

Originally Posted by Steve390Gold

...that is way way way too much money for a simple bms / charging setup.....

There are other brands of BMS systems out there. I have a Chargery BMS (not yet installed), I saw a post by BobBoyce on this topic http://www.buggiesgonewild.com/lithi...mable-bms.html

Quote:

Originally Posted by BobBoyce

With lower cost Leaf modules available, there should be no reason that a 7 module conversion should cost more than buying a new Lead/Acid pack.

I used a preprogrammed simple 14 cell BMS PCB on my 7 Leaf module RXV conversion. I retained my Lead/Acid charger.

I took forever to convert to Lithium because I thought I had to buy a $1000 (or more) BMS. The Chargery was $106. I switched and I see that the batteries I have are all very well balanced with each other so long as I don't do anything stupid... Which I am prone to do... But I have not yet had need of a BMS. I just set my pack voltage cutoffs so I have a nice safety margin. Charging gets to 57.6v (4.11vpc) and discharge goes down to 45.5v (3.25vpc). I purchased a new charger ($76) that I could use to set the HV cutoff and programmed my Alltrax to stop at 45.5v. The BMS will come soon enough, but it is not an urgency.

There are many BMS units out there for far less than the Chargery too. 14 cells seems to be a pretty common number that people are using for their projects, 16 cell BMS may be harder to find???

Steve390Gold · 05-14-2019, 02:08 PM

Quote:

Originally Posted by bronsonj

There are other brands of BMS systems out there. I have a Chargery BMS (not yet installed), I saw a post by BobBoyce on this topic http://www.buggiesgonewild.com/lithi...mable-bms.html

I took forever to convert to Lithium because I thought I had to buy a $1000 (or more) BMS. The Chargery was $106. I switched and I see that the batteries I have are all very well balanced with each other so long as I don't do anything stupid... Which I am prone to do... But I have not yet had need of a BMS. I just set my pack voltage cutoffs so I have a nice safety margin. Charging gets to 57.6v (4.11vpc) and discharge goes down to 45.5v (3.25vpc). I purchased a new charger ($76) that I could use to set the HV cutoff and programmed my Alltrax to stop at 45.5v. The BMS will come soon enough, but it is not an urgency.

There are many BMS units out there for far less than the Chargery too. 14 cells seems to be a pretty common number that people are using for their projects, 16 cell BMS may be harder to find???

Where did you get your chargery setup? And what model numbers did you get?

Quote:

Originally Posted by DaveTM

I dunno......pick up 14 modules for $85 a piece. That's $1,200.

So....for $2,000 you have a low maintenance lithium set up with gobs and gobs of run time.

I got all 10 Nissan Leaf cells for 650 shipped to my door. I just finished up fabricating the bus bars for them as well.

Quote:

Originally Posted by E36Racer

Don’t forget the prices on the Zeva website are AU$. So you need to multiply them by $0.72 to convert to USD based on today’s exchange rate.

That's a VERY good point. Ill be giving him a call/email in a few moments. Thank you.

01-18-2019, 11:30 PM	#1
Steve390Gold Not Yet Wild Join Date: May 2018 Posts: 69	Zeva confusion.... Ok my FLA batteries are on the way out. I cant stand the things anyhow.... Im going to run a "72v" setup utilizing 10 nissan leaf battery modules (20 cells.) To that end a pair of Zeva's 12-cell Lithium BMS Module V3 should each handle 10 cells without issue. Now my confusion falls on what else is needed. Can i juat run a single EVMS Monitor V3 and be done with it, or MUST i also run a Electric Vehicle Management System V3? I really dont want the EVMS if i can avoid it....and will such a setup without the EVMS be capable of shutting off a charger?
Steve390Gold Not Yet Wild Join Date: May 2018 Posts: 69

01-19-2019, 09:19 AM	#2
DaveTM Gone Wild Join Date: Oct 2012 Location: Southwestern Pa. Posts: 6,214	Re: Zeva confusion.... From what I see, the EVMS appears to be for high voltage setups. The documentation shows their example of a pack voltage of 148-V. Way more than the 57-V BMS that I'm running. The ZEVA 12 cell BMS states the maximum voltage is 60-V. Now, I'm not quite sure of the setup using this for a 72-V system. This post may not be much of a help in answering your question.....more of a "Hmmmm" how you gonna do that? FWIW

01-21-2019, 12:30 PM	#5
Sergio Gone Wild Join Date: Sep 2012 Location: Charlotte, NC Posts: 9,329	Re: Zeva confusion.... That is actually pretty cheap for automotive grade BMS, but it is likely overkill for a Golf cart system.

01-21-2019, 12:54 PM	#6
E36Racer Gone Wild Join Date: Jan 2017 Location: Miami, FL Posts: 1,061	Re: Zeva confusion.... I think your best bet is to contact Ian at Zeva on this one. You may need to go with his older setup that I have, EVMS Lite V2 with two of the BMS 12 modules. But I’m not positive, I guess there is the possibility you can add one of the 12 cell modules to the BMS16 via CAN. Ian will give you the best setup for your needs.

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