question

whafa avatar image
whafa asked

Best 48v BMS

Hi everyone,

I am expecting a shipment of 16x280Ah prismatic LiFePO4 cells. It is my first experience with non-lead acid batteries. I understand that I need a BMS, but there is incredible selection and profound difference in cost between models. I currently have a Cerbo GX which I understand has two data busses, a CAN bus and a proprietary VE.bus. This paragraph is the entire sum of my BMS knowledge, +/-.


I want to find a BMS that integrates maximally with the Cerbo. I'm happy to pay for quality. I don't necessarily need it to be a "supported" solution by Victron, as long as it integrates well. In another group on DIY Powerwalls, Batrium seems to be the most popular name in BMS. Is anyone running a similar system to what I've described, with a Batrium BMS?


What other options do I have? I'm also impressed with REC-BMS, but it's very pricey. A couple other ones I've glanced at are 123Smart BMS, Tiny BMS, Chargery BMS and DIY BMS. Also Daly?


The two most important things to me are 1) safety and 2) integration with my Victron products. This will be a 16s, 48v (although it's not a strict design requirement) LiFePO4 battery with low-moderate current requirements (probably something like a 3000 watt inverter). Thanks for any input!

cerbo gxLithium BatteryBMSVE.BusVE.Can
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7 Answers
nebulight avatar image
nebulight answered ·

You say you are happy to pay for quality, but in the next paragraph you state you are impressed with REC but it's very pricey. The maximum integration with Victron is going to be REC. Batrium does work as well, but I don't have any experience with using it. However if you think REC is expensive, Batrium is even more.

While it's not officially supported by Victron, REC makes sure their BMS communicates with Victron gear. You do get what you pay for with REC. With that said, how do you plan on using this system? Will it have DC loads? Their 16s configuration doesn't support disabling external loads (like DC loads) so you have to keep that in mind. If the battery is fully discharged by a DC load (that the BMS can't control) then it will disconnect the main contactor which basically turns off the battery.

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whafa avatar image whafa commented ·

Thank you for the reply. It's true, I am a bit shocked at the higher end prices of BMS. But I am making a substantial investment in my battery, and the raw cells were (relatively) cheap considering their capacity, so it will be worth it to find something that will coddle those cells.


The system is ultimately intended as a (probably) off-grid replacement to a utility line coming into my shed, which powers a standard fridge, freezer, washer and dryer, lights and tool chargers. Farther down the line, I'd like to integrate it to my house panel for emergency backup power. I live in a very mild climate with zero AC needs and gas for heat.

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Meine_Energiewende avatar image
Meine_Energiewende answered ·

Batrium works quite well with my victron system and my lifepo4 cells. But it is quite expensive too. It integrated fully into the cerbo and victron environment.

Jens

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Juraj Nikolov avatar image Juraj Nikolov commented ·

Can GX handle more than one Batrium BMS ??? for example 3 pcs ???

Thanks


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nickdb avatar image nickdb ♦ Juraj Nikolov commented ·
The GX will only use one. So if the BMS isn’t capable of master/slave configs it will just ignore the rest.
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marekp avatar image marekp nickdb ♦ commented ·
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autox avatar image autox commented ·
Hi jens,


Not knowing how to reach you differently, so hoping you will answer here.

You have a lot of batteries and batrium.

So you connected these batriums by can to each other and the main controller on the wall.

Can you link some resource so I can read or watch how this was done exactly?

Currently using jkbms and cerbo does only support 1 master bms.

As per my opinion, I want to have central bms managing all cells and telling cerbo when to throttle the speed of charging.


If you would able to help it us highly appreciated.

Thanks

Chris




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tristan-klatt avatar image
tristan-klatt answered ·

Hi whafa,

i had tested a lot of BMS´in the last years, but not Batrium or REC - both are very expensive and i tried to find a solution that works, but for a "diy"-price.

To describe all the other BMS i tested woud be too much for this forum, but i can give you a good recommendation for the following sources:

On youtube look for the channels "offgrid garage" by Andy from Australia - he did a lot of tests too and has links on his hp to inexpensive sources on aliexpress. Especially look for the Hankzor BMS. I will install this in my next project too. Second channel on youtube ist "Meine Energiewende", a german guy, very familiar with Victron products an also with the Hankzor BMS. On https://www.youtube.com/shorts/fw_fJFkhnX0 he shows the wiring for this BMS with a Victron installation and it works fine.

Nevertheless is it a lot of work to read, listen and understand all the backgrounds, to install this combination yourself, but if you understand your system, it´s much more fun and a lot of money you can save.


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David avatar image David commented ·
Andy doesn’t use any BMS that communicates with the Victron. There is no can bus comms at all. The batteries are basically stand alone.
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jeanmarie avatar image
jeanmarie answered ·

Hi @Whafa

don't know the price range you are talking about for mentioned products but I can testify that Seplos BMS are working well within the victron environment (I have 6 of them chained and with one BMS CAN link)

The only disadvantage I found up to now is that the RS485 link (allowing you to see / program the BMS datas) is not compatible with BMS CAN, which means you must disable the BMS CAN communication for the time being you need to send new configuration to the BMS, fortunately this is not really common.


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leighc avatar image
leighc answered ·

Tao make a good BMS, but you need a master (12v base system) & 3 slaves (extensions)

They integrate with Victron via CANbus & have Dynamic 4amp cell balancing, There is a comparison sheet on the Website

TAO Performance ‣ Lithium Battery & Energy Management System

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Paul B avatar image
Paul B answered ·

The ones I have used are TAO and 123 smart BMS, the best priced one is 123Smart BMS, it also has a FULL interface to the Cerbo being a USB connection unit. we have installed over 100 sets of these ourselves and they have proformed VERY well, you can also connect by Bluetooth, and there support is excellent.

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Paul B avatar image Paul B commented ·
Of note they are Passive balancing - TAO is active balancing.
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gero avatar image
gero answered ·

I even can not understand why Victron is not willing to make the system more open for other DIY BMS systems, like JK Hankzor, Daly, LLT which are in a very good price level and more technically up to date than REC and other BMS Systems for 500-1000 €. The supported BMS are working with passive balancing, mechanical contactors etc. vs. Hankzor / Daly which are working with modern MOS,they can select between switchen charge and discharge current, have active balancing funktions and Smart APPs working out of the box. For those BMS it is necesary to use third parts drivers and hours of trail and errors as well a study at Youtube-University. Due that Victron devices are also produced in China, it would be a easiness for their chinese engineers to make it compatible for the chinese BMS stuff.


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