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Standalone Lithium BMS Systems


MYBRIDH

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Hi Chaps.

Hope you are well.

Guys,kindly please share some wisdom with me.

I have a few NMC Lithium Batteries.  Essentially an enclosure and cells, but no management system. Would you be able to recommend a supplier who could help out?

They are 28 Cell units, but charge voltage ~56V ,  I am expecting that the internal configuration though is 14 pairs of 2 paralleled cells. I will need to physically inspect to confirm . This being the case I guess I would need 14s BMS.

Also, would I be correct in assuming that in general:

  • Cell balancing and temperature protection are the most vital functions needed from a Lithium Battery Management System
  • Over/Under Voltage and Current protection would be provided by  your Charge Controller and Invert

I eagerly looked up the Orion BMS's as I have seen them mentioned a few times. Almost had a heart attack when I saw the price compared to what complete batteries sell for here.

Would much appreciate your thoughts.

 

Later

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2 hours ago, MYBRIDH said:

Hi Chaps.

Hope you are well.

Guys,kindly please share some wisdom with me.

I have a few NMC Lithium Batteries.  Essentially an enclosure and cells, but no management system. Would you be able to recommend a supplier who could help out?

They are 28 Cell units, but charge voltage ~56V ,  I am expecting that the internal configuration though is 14 pairs of 2 paralleled cells. I will need to physically inspect to confirm . This being the case I guess I would need 14s BMS.

Also, would I be correct in assuming that in general:

  • Cell balancing and temperature protection are the most vital functions needed from a Lithium Battery Management System
  • Over/Under Voltage and Current protection would be provided by  your Charge Controller and Invert

I eagerly looked up the Orion BMS's as I have seen them mentioned a few times. Almost had a heart attack when I saw the price compared to what complete batteries sell for here.

Would much appreciate your thoughts.

 

Later

unless you have a very specific need for configuring your pack to a very specific set of requirements, and have it "talk" to a clever inverter i would throw a Chinese BMS at the problem. run Buy  2 and have a spare just in case. I have read of any of the BMSes dying in a connected mode and letting the battery runaway from you. I have seen then just die and stop operating as the default. you then can get a bluetooth app for some of them that you can do some rudimentary settings (max and min cult-off voltages, parallel pack voltages setting) and monitoring.

I have one BMS on my power-wall, the packs were built fairly well balanced (I used Repakr ) but I do check my packs twice a day everyday  and they have behaved so far. The BMS does get a fair work out top balancing my packs if the packs have been through a few days where I have thrashed them, then they do begin to drift apart and the BMS has to even it all out for me.

If Chinese isn't for you then the Batrium a excellent option and I have it on my wish list! I am hoping Santa decides I have been a good boy and lets me buy it for myself... @Seant had a Batrium installed on his power-wall and was very pleased with its performance .

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Hi  Mike.

I much appreciate your response, thank you very much.

The Batrium definitely looks worth considering.

So if I had 5 of these 14s batteries (2.5kWh each for arguments sake)  operating in parallel, I would need a Watchmon4 and 5 x 14 of the Longmons. That seem accurate ?

The  approx cost of this would be in the region ~R25K, before Shipping, Duties and Taxes.

This is what confuses the hell out of me. The going rate for lithium batteries (admittedly I could do more homework here) seems to be in the region R5k to  R10k per kWh. 

Considering the above, R2k to R3k/kWh of that cost is BMS.

Am I missing something here or is that typical?

 

To throw some more questions out there.

What are typical Duties and Taxes on importing such items?

 

Considering my financial situation i cant be too choosy. If there are any Chinese BMS that are suitable and have proven themselves locally I am all ears.

 

Regards

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Best is to go google BMS and go check youtube. there some guys that are testing them and putting them fro the pace to see what they can do. There some nice Chinese BMS that can do a lot of stuff actually, like running Bluetooth apps and Coms and there is even some of them that can operate contacters that can help allot. Some of them have cell balancing to. This past few days a did  a lot of reading up and checking what option there is.    

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5 minutes ago, Gerlach said:

Best is to go google BMS and go check youtube. there some guys that are testing them and putting them fro the pace to see what they can do. There some nice Chinese BMS that can do a lot of stuff actually, like running Bluetooth apps and Coms and there is even some of them that can operate contacters that can help allot. Some of them have cell balancing to. This past few days a did  a lot of reading up and checking what option there is.    

Hi, Thank you Gerlach.

Has there been any one product that peaked your interest?

There certainly are products out there but I am hoping to also receive some insight into what might be available locally and have some proven track record among the forum members.

Later

 

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  • 2 weeks later...
On 2019/11/27 at 3:27 PM, MYBRIDH said:

Hi, Thank you Gerlach.

Has there been any one product that peaked your interest?

There certainly are products out there but I am hoping to also receive some insight into what might be available locally and have some proven track record among the forum members.

Later

 

I placed a order for this one https://www.aliexpress.com/item/33014476298.html?spm=a2g0s.9042311.0.0.57a94c4d960RPl 300amp with screen and i order 4 of them https://www.aliexpress.com/item/32995053686.html?spm=a2g0s.9042311.0.0.57a94c4d960RPl

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4 hours ago, Richard Mackay said:

This is also one on my list..

If you haven't seen this guy's contribution check it out: 

I reckon he's on top of the theory and practical. What's also great is that he share's his knowledge for mahala!

Enjoy!

re's 

He

 

 

He is using Batrium in this build. 

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18 hours ago, Richard Mackay said:

This is also one on my list..

If you haven't seen this guy's contribution check it out: 

I reckon he's on top of the theory and practical. What's also great is that he share's his knowledge for mahala!

Enjoy!

 

 

Thank you @Richard Mackay, I will be sure to check out a few of his vids.

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Thanks @Gerlach.

 

I have taken a look at that BMS........assuming that is the that the Ant BMS?

I would be very keen to hear how it works for you.

 

The Orion, Batrium  and Chargery BMS's  look to be very complete in their development, a finished product with decent functionality (speculation )  with everything in Enclosures etc.......................and the price tag to boot unfortunately.

My pick would probably be the Batrium, per my understanding  a bunch of Longmons and one BMS would allow me to monitor individual cell on all of the 5 parallelled batteries. That versatility makes it very attractive.

Alas it is very expensive and the Chargery, even though I need one per each of 5 batteries is considerably cheaper.

At the endo of the day, I still dont quite know what I need, I am sure there are charge controllers/Inverters  that could manage everything with the exception of individual cell monitoring/balancing in which case cell balancers only may be sufficient.

 

Maybe I shouldnt be putting the cart before the horse and take another look at the bigger picture........

 

Much appreciate the input.

 

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