Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 09-07-2019, 16:48   #1
Registered User
 
aybabtme's Avatar

Join Date: Oct 2015
Location: California
Boat: Hunter Legend 37.5
Posts: 57
Choosing a BMS for 8S (24V) prismatic LiFePO4 cells

Hi there,
I've been scratching my head trying to decide on which BMS I should get. I'm working with an 8S battery bank and would like to control up to 250A (750A peak), to feed a 6000W inverter. I've been looking at:

- Batrium
- 123 Smart BMS
- Orion Jr BMS
- REC Q BMS

They are a bit different from each other and I find it confusing to compare them. Has anyone had any experience with them?
__________________

__________________
--
Antoine
aybabtme is offline   Reply With Quote
Old 09-07-2019, 22:56   #2
Registered User

Join Date: Feb 2017
Location: Panama, Central America
Boat: CT 49, 1989
Posts: 768
Re: Choosing a BMS for 8S (24V) prismatic LiFePO4 cells

Quote:
Originally Posted by aybabtme View Post
Hi there,
I've been scratching my head trying to decide on which BMS I should get. I'm working with an 8S battery bank and would like to control up to 250A (750A peak), to feed a 6000W inverter. I've been looking at:

- Batrium
- 123 Smart BMS
- Orion Jr BMS
- REC Q BMS

They are a bit different from each other and I find it confusing to compare them. Has anyone had any experience with them?
Yes agreed. I have been mulling over the same question myself for some time.

Sorry I dont have the answer for you either. But I am also looking around the same size as you are talking about with 8S 24V, looking 400-600 AH range. So Im interested in what comes of your question.

IMNSHO its the 'trickiest' question as there just doesnt yet seem to be any clear proven winners.

The chargers are pretty straight forward, although still questions get asked these are relatively minor details. I have gone with Sterling Prochargers, Victron MPPTs and Open source Alt regs. I also have a BS ACR and Sterling B2B to charge my 12V Start batt. I also have a Victron BP220 'LVC'.

Ive got and setup these components in preparation for my LFP upgrade with my existing 'tired' FLA setup. So far it's all working quite well and I'm happy with the way it works. Of course its taken some time and effort to get to this point, and Im still not there yet.

Cells, always some discussion, but to me Sinopoly or CALB seem a reasonable bet with prices getting quite reasonable these days.

I have been leaning mostly towards the 'Smart BMS'. But I have to say the Batrium also looks quite compelling. Its newer on the scene. Although I have heard some possible user 'issues'? It remains to be seen how this will shake out. I guess this has contributed to delaying my decision.

Like you Im keen to hear some real world experience feed back.
__________________

Q Xopa is online now   Reply With Quote
Old 15-07-2019, 01:22   #3
Registered User
 
aybabtme's Avatar

Join Date: Oct 2015
Location: California
Boat: Hunter Legend 37.5
Posts: 57
Re: Choosing a BMS for 8S (24V) prismatic LiFePO4 cells

I attempted to get more information from Batrium, but their support person refused to provide any substantive information, pointing me to their paid consultation instead. I followed up and asked how they would compare their products to competitors, and support basically told me to do my own research. Which obviously I'm doing, but how am I supposed to take seriously a company who basically refuses to explain how they differentiate from their competitors. In my book, and since Batrium comes a bit off putting with their 3D printed setup, that leaves them out of the loop. The interaction was unpleasant and I wouldn't want to deal with that attitude if I have an urgent need.
aybabtme is offline   Reply With Quote
Old 15-07-2019, 09:58   #4
Registered User

Join Date: Feb 2015
Posts: 832
Images: 1
Re: Choosing a BMS for 8S (24V) prismatic LiFePO4 cells

Quote:
Originally Posted by aybabtme View Post
I attempted to get more information from Batrium, but their support person refused to provide any substantive information, pointing me to their paid consultation instead. I followed up and asked how they would compare their products to competitors, and support basically told me to do my own research. Which obviously I'm doing, but how am I supposed to take seriously a company who basically refuses to explain how they differentiate from their competitors. In my book, and since Batrium comes a bit off putting with their 3D printed setup, that leaves them out of the loop. The interaction was unpleasant and I wouldn't want to deal with that attitude if I have an urgent need.

Wow, yes, that would take them off my list too.
__________________
www.MVTanglewood.com
tanglewood is offline   Reply With Quote
Old 15-07-2019, 13:57   #5
Registered User

Join Date: Feb 2017
Location: Panama, Central America
Boat: CT 49, 1989
Posts: 768
Re: Choosing a BMS for 8S (24V) prismatic LiFePO4 cells

Quote:
Originally Posted by aybabtme View Post
I attempted to get more information from Batrium, but their support person refused to provide any substantive information, pointing me to their paid consultation instead. I followed up and asked how they would compare their products to competitors, and support basically told me to do my own research. Which obviously I'm doing, but how am I supposed to take seriously a company who basically refuses to explain how they differentiate from their competitors. In my book, and since Batrium comes a bit off putting with their 3D printed setup, that leaves them out of the loop. The interaction was unpleasant and I wouldn't want to deal with that attitude if I have an urgent need.
Yes disappointing to hear.
Q Xopa is online now   Reply With Quote
Old 15-07-2019, 14:47   #6
Registered User
 
aybabtme's Avatar

Join Date: Oct 2015
Location: California
Boat: Hunter Legend 37.5
Posts: 57
Re: Choosing a BMS for 8S (24V) prismatic LiFePO4 cells

On the other hand my discussion with REC has been fruitful. Still waiting to hear from Orion.
aybabtme is offline   Reply With Quote
Old 22-11-2019, 09:23   #7
Registered User
 
MikeFergie's Avatar

Join Date: Mar 2015
Location: Mozambique
Boat: Leopard 40 (2009) & Crownline 250CR
Posts: 316
Re: Choosing a BMS for 8S (24V) prismatic LiFePO4 cells

I decided to try out a simple BMS that works on temp, HVC disconnect and LVC disconnect and do the cell balancing separately.

BMS - Deligreen Common Port 4S 250A High Current Lifepo4 12v with programmed 120 amp max charger input. Itís a waterproof unit.

Cell balancers - High tech Active lifepo4 cell Balancer for Lifepo4 . I have one for each cell so 12 in a battery pack

My cells are CALB CA100 cells in 3P4S configuration so 12 cells in one battery giving me 300amp hours or 4140 watt hours. I have built 2 batteries and will be putting them in my boat at the end of the year after running them in my house to check all is in order.

I need to reprogram my victron MPT controllers and my multiplus 3000/12/120 as well. I have also imported the Balmar 614s and combiner to deal with my alternators.

Click image for larger version

Name:	IMG_0052.jpg
Views:	63
Size:	178.2 KB
ID:	203542Click image for larger version

Name:	IMG_0069.jpg
Views:	68
Size:	114.6 KB
ID:	203543


Rgards
MikeF
MikeFergie is online now   Reply With Quote
Old 22-11-2019, 09:42   #8
Registered User
 
MikeFergie's Avatar

Join Date: Mar 2015
Location: Mozambique
Boat: Leopard 40 (2009) & Crownline 250CR
Posts: 316
Re: Choosing a BMS for 8S (24V) prismatic LiFePO4 cells

My build so far.

Is there an advantage/ disadvantage ( must be some I suspect) of connecting all 3 batteries in the parallel group versus only the opposite end or as Iíve seen the 2 end batteries but leaving the centre out in the battery make up.Click image for larger version

Name:	IMG_0070.jpg
Views:	103
Size:	95.6 KB
ID:	203544

Rgards
MikeF
MikeFergie is online now   Reply With Quote
Old 10-01-2020, 04:48   #9
Registered User
 
aybabtme's Avatar

Join Date: Oct 2015
Location: California
Boat: Hunter Legend 37.5
Posts: 57
Re: Choosing a BMS for 8S (24V) prismatic LiFePO4 cells

Sorry I just saw this. Yes there's an advantage: if the cells aren't connected parallel-first, there's nothing preventing them from becoming disbalanced. In theory, you'd need 1 BMS for each series-string, along with all the disconnect protection circuitry. A lot of waste.
__________________
--
Antoine
aybabtme is offline   Reply With Quote
Old 24-01-2020, 14:14   #10
Senior Cruiser
 
Steve_C's Avatar

Cruisers Forum Supporter

Join Date: Apr 2009
Location: Bulverde, Texas
Boat: Shopping for a Cat
Posts: 427
Re: Choosing a BMS for 8S (24V) prismatic LiFePO4 cells

Has anyone found a good source for the REC BMS here in the US? I really like their hardware, but I can only find it in Europe and Australia. I have emailed them but have not yet heard back.
__________________
_________________
_____________
Steve
Steve_C is offline   Reply With Quote
Old 03-02-2020, 22:16   #11
Senior Cruiser
 
ronstory's Avatar

Cruisers Forum Supporter

Join Date: Sep 2015
Location: Portland, OR USA
Boat: C&C 35 MK-II
Posts: 331
Re: Choosing a BMS for 8S (24V) prismatic LiFePO4 cells

Quote:
Originally Posted by Steve_C View Post
Has anyone found a good source for the REC BMS here in the US? I really like their hardware, but I can only find it in Europe and Australia. I have emailed them but have not yet heard back.
I have the REC-Active, the 12V only version. I just contacted them via email and they replied in a day or so and suggested I just order direct from them. they answer all my questions and I place the order. The price was very reasonable and I got the BMS is right around a week from when I ordered.
__________________
Thanks,
Ron
ronstory is online now   Reply With Quote
Old 03-02-2020, 22:30   #12
Registered User
 
aybabtme's Avatar

Join Date: Oct 2015
Location: California
Boat: Hunter Legend 37.5
Posts: 57
Re: Choosing a BMS for 8S (24V) prismatic LiFePO4 cells

I looked at REC but with the Orion Jr being a similar price, up to 16 cells and more supported by stores in the US, I think it's a better buy if you're in the US (local electric internet shops sell Orion but nit REC). I don't think the active vs passive balancing is worth getting excited about, it's not like new, quality LFP cells need much balancing anyways.

Also the Orion Jr integrates with Victron's GX devices over CANBUS (like REC).
aybabtme is offline   Reply With Quote
Old 03-02-2020, 22:35   #13
Senior Cruiser
 
ronstory's Avatar

Cruisers Forum Supporter

Join Date: Sep 2015
Location: Portland, OR USA
Boat: C&C 35 MK-II
Posts: 331
Re: Choosing a BMS for 8S (24V) prismatic LiFePO4 cells

In my case the REC came out a lot cheaper for all the options than the Orion. The Orion folks were more in to electric cars... and the canbus option a better deal on the REC IMO.

My money, my choice. Your money, your choice.
__________________
Thanks,
Ron
ronstory is online now   Reply With Quote
Old 03-02-2020, 22:41   #14
Senior Cruiser
 
ronstory's Avatar

Cruisers Forum Supporter

Join Date: Sep 2015
Location: Portland, OR USA
Boat: C&C 35 MK-II
Posts: 331
Re: Choosing a BMS for 8S (24V) prismatic LiFePO4 cells

Just checked my invoice. The REC-Active (12V only) was 250 Euros with harness, the PC link was 55 euros and canbus cable 13 euros. Shipping was $40 for 1 week delivery.
__________________
Thanks,
Ron
ronstory is online now   Reply With Quote
Old 03-02-2020, 23:18   #15
Registered User
 
aybabtme's Avatar

Join Date: Oct 2015
Location: California
Boat: Hunter Legend 37.5
Posts: 57
Re: Choosing a BMS for 8S (24V) prismatic LiFePO4 cells

Yeah I think the REC is probably a great buy! Don't get me wrong!
__________________

__________________
--
Antoine
aybabtme is offline   Reply With Quote
Reply

Tags
lifepo4

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Merged LiFeYPO4 1000Ah Winston prismatic cells and all electric galley... CatNewBee Lithium Power Systems 406 01-02-2020 08:55
LiFe(Y)PO4 BMS Dessign - good reading for DIY BMS developers CatNewBee Lithium Power Systems 10 20-09-2018 00:15

Advertise Here


All times are GMT -7. The time now is 12:45.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.