Looking for a new BMS system for 14x LiIon 18650 batteries with a storage capacity of 30kwh

[Walde]

Looking for a new BMS system for
14x LiIon 18650 batteries with a storage capacity of 30kwh

Volt maximum 57v (60V overcharged) Li Ion 18650 cells 14x parallel with maximum 4.10V each.
Currently I still have the old "DIY BMS 2.0" running, which is good except for the communication bus.

What alternatives do you have running or would you recommend

My plant about 1-2 years ago. Just more batteries now
DIY Powerwall Home Drive V2

 

[OffGridInTheCity]

Skipping thru the youtube I see Chargery and perhaps Stuarts DIY?

I use Batrium but it's significant $. I also use Chargery and even though 40% of them break, the ones that work are doing well!

Can you narrow down your criteria a bit - e.g. are you going for DIY or limited $ or .... For example, what would turn you away from Batrium?

 

[Walde]

Can you narrow down your criteria a bit - e.g. are you going for DIY or limited $ or .... For example, what would turn you away from Batrium?

Batrium is just too expensive for me. Shipment to Germany and then customs fees and 19% import sales tax

 

[Oberfail]

Currently I still have the old "DIY BMS 2.0" running, which is good except for the communication bus.

What alternatives do you have running or would you recommend

The newest DIY BMS Version. Tons of improvements have been made. But due to the chip shortage, it takes time to get the parts and you need to solder some yourself.

 

[Walde]

The newest DIY BMS Version. Tons of improvements have been made. But due to the chip shortage, it takes time to get the parts and you need to solder some yourself.

DIY BMS 4.0 would be an option. But maybe there are alternatives in this area. In terms of cost and labor. I became a father and there is a shortage of both. I hope you understand what I want to say.

 

[Oberfail]

Yeah, but sadly the only alternative is Batrium for a ton of $ with what i heard pretty horrible support.
If you are a bit patient, there are people bulk ordering parts of the bms here and there: https://forum.drbacke.de/

 

[OffGridInTheCity]

Was watching a guy add a 2nd battery to his DIY off-grid system - using a HelTec BMS - https://heltec-bms.com/product/13-2...an-rs485-mobile-app-via-bluetooth-for-e-bike/

HelTec has a range of models for Lion / LifePo4 with some pretty hi amp options.

Here's the youtube where he mentions his BMS here/there thru the tube... He's been running his 1st one at least a year with no problem

View: https://youtu.be/26QkY0s3vdk

 

[100kwh-hunter]

Batrium is very expensive indeed for eu.
Can i suggest a bms of Daly, i must say that they are working very good.
You can easy change the parameters/settings if you buy one with a bt thing.
It really does what it must do, guard your cells as a junkyard dog....to your settings.
They do a little balancing above a level you set, just 1a, so i would also suggest to buy a active balancer.

 

[JonCombat]

I am getting close to building my 14s x 80-84 cells. Waiting to check the last batch for self discharge. I am looking for a decent BMS for the $$. I see many video's with Batrium but they are very expensive. Since this is my first build should I use Daly < $200 (14S 250Amp). Can anyone give me the Pros/cons of both. Also, what type of charger/balancer do you recommend. As of now I do not have solar, I just built the pack out of recyled 18650 battery packs I salvaged from work for fun. Eventually I will pick up an inverter and use it for emergency power.

 

[OffGridInTheCity]

DALY is often chosen and often works but also I read of many frustrated posts. I would say DALY seems about in the middle of what you get for that price - would be a reasonable starting point.

You want a 14s Lithium-ion specific charger so you get the proper CC/CV charging. Don't try to use lead-acid or LifePo4.

A 14x80p battery at 2600mah/cell will be 208ah @ 48v = ~10kwh.

I have several YZPOWER chargers like this 15a @ 48v - https://www.ebay.com/itm/284647244994 15a @ 48v = ~700w. This means a 15a charger will take 14.2hrs to charge 10,000w. I mention this because there are cheaper, less amp chargers such as 7a - which would take 28hrs to do 100% charge.

If you're planning to expand your battery bank, you might want to checkout the new EG4 CHARGEVERTER-5000 - https://signaturesolar.com/eg4-chargeverter-battery-charger-48v-100a-5120w-output-240/120v-input - which can do up to 100a and is a really good price / charging amps! At 100a you can charge you're 10,000w battery in a little over 2hrs.

It's a matter of how fast you want to charge

 

[100kwh-hunter]

Can anyone give me the Pros/cons of both. Also, what type of charger/balancer do you recommend

The pro's:
they are junkyard dogs, the worst.
if a cell goes south the bms will cut.
If a cel is at a min or max it will cut charge or discharge.
Its all in your owm parameter setting, set what ever you want.

If installed more than one they will act like one:
I have 4x 100a dis/50a charge, on 4 "separate" banks connected by one busbar.
They are leveling the banks out to the exact same V (0.001)
If discharging/charging they wil get the same amount of each bank.
In my case i can do now a 400a dis and a 200a charge.

For a balancer i can be very short:
Heltec, they do exactly what they must do.

Con's:
when bought 5 bms'ses and 5 balancers, you would be getting in the price range of batrium or 123smart bms.
To do your settings you must buy one with bt.

DALY is often chosen and often works but also I read of many frustrated posts

As stated above, most frustrations are pretty simple explained, no bt and some dont do the advice connecting sequence.
Costed me a bms, please do as advised on connecting them.
Also when they have there v checked, dont put them on a other v bank, from 24 to 48 or the other way around.

If one of your set parameters is reached the bms will cut off completely.
When one cell hits your minimum it will cut off and only except charge.
If one cell hits your max settin it will cut off and only except discharge.
Incl for your bank/pack min/max ect.

Yes i am very happy with them: simple, very effective and very cheap for a good false and loyal junkyard dog

With best regards, Igor

 

[JonCombat]

Thank you for all the info. I did see a few online videos of the Daly bms not balancing if a battery hits the high voltage limit, and only balances while charging.

 

[Franky Beuselinck]

Today, there's not much competition on the BMS market. Here, you find my latest video with JK BMS & all settings:

View: https://youtu.be/YHGe2kxH8Ls

 

[100kwh-hunter]

Thank you for all the info. I did see a few online videos of the Daly bms not balancing if a battery hits the high voltage limit, and only balances while charging.

Uhm, yes i saw some of those vids as wel, but they are not completely honest.
You can set the "balance mode" at charge or discharge or anytime.
You can also set at what v difference they must start balancing.
Factory default is 0.080v and only when charging.
But you can go to menu; active balance, and set: "start balance volt at" factory setting is for li ion 3.8v i thought and for lifepo4 3.3v.
you can set it as low as you want.
You can set only while charging or only at discharging, or both.
Set "start balance at v diff" at 0.001v if you want, or even at 1v.

For good cells and easy use, daly can do the job. i have mostly b grade lifepo and i am sometimes really kicking them.
Incl li ion laptop/ebike incl nimh cells.(in one system)
Thats why i have a extra healtec balancer.
As the system is growing/expanding, i can do with less and less heavy equipment.

Hope this was helpfull.
Best