Need recommendation for AC coupled inverter for 48V batteries (Australia)

[<-&->]

Imo CANBUS for Low voltage batteries are just a gimmick. Even lfp batteries with pretty much flat voltage curve works perfectly fine without comms. You dont need comms at all for lithium ion batteries like these

If Lithium batteries are drained below the stated threshold they will go into cemetery mode and not be able to be awakened , that level is around 23 volts from memory for these cells.
The inverter can talk to the batteries and work out a reasonable arrangement between them IMO.

44.8 volts is the level given for best lifecycles of the battery as calculated by guys in white lab coats who get paid to sit there and calculate numbers that over a long time frame , add value to the reputation of the brand.
I wont throw sharp pointy things at a dart board to decide who i will give credibility to , i am just going with the guys in white lab coats for the hell of it.

 

[<-&->]

Hi. Absorb and equalize are really for lead acid batteries. You shouldn't apply equalize to lithium ion batteries like these. Most MPPT controllers will require you have some time on absorption but keep this as short as the controller allows.
These are labelled as 14S lithium ion. If charging to 4V per cell for longevity = Float of 56V. Play around with the absorption voltage unit they float at 56V. Something like 56.5V is a good place to start.

Yes , I turned off equalisation , in fact the Lithium presets in Victron turn it off.
I used the stated 58.1 for bulk and 51.52 float , so far my Victron MPPT and the battery seem to be purring okay.
.
Since i picked up my batteries I am bringing them all up to full SOC without load as a maintenance / protection charge until i sort out the type of inverter i will use.

 

[RSahan]

If Lithium batteries are drained below the stated threshold they will go into cemetery mode and not be able to be awakened , that level is around 23 volts from memory for these cells.
The inverter can talk to the batteries and work out a reasonable arrangement between them IMO.

44.8 volts is the level given for best lifecycles of the battery as calculated by guys in white lab coats who get paid to sit there and calculate numbers that over a long time frame , add value to the reputation of the brand.
I wont throw sharp pointy things at a dart board to decide who i will give credibility to , i am just going with the guys in white lab coats for the hell of it.

Yeah but you dont needs comms for that. You set the values on the inverter to be little higher than BMS low voltage cutoff and little lower than BMS high voltage cutoff.

You also have the BMS to do the second round of protection with its own low/high voltage cut off.

I have been running my Deye this way for over 2 years. I have no interest in setting up BMS comms

 

[<-&->]

You guys recommending the JK BMS need to watch these YT videos . Faults have been found with them that could potentially damage batteries or cause a fire.
If the BMS is turned off for a day or two the software reverts back to default settings , they lose all the pre-programmed parameters and a few other small issues that JK didnt fix 100 % yet , maybe they will fix it given time , or ???.

 

[Boris_91]

Yes , I turned off equalisation , in fact the Lithium presets in Victron turn it off.
I used the stated 58.1 for bulk and 51.52 float , so far my Victron MPPT and the battery seem to be purring okay.
.
Since i picked up my batteries I am bringing them all up to full SOC without load as a maintenance / protection charge until i sort out the type of inverter i will use.

Thanks for this. To make sure I'm understanding right, have you connected your Victron to the 6mm + - battery terminals and are charging through the batteries on board BMS?
Or are you charging through the 8mm terminals which bypass the onboard BMS?

 

[Boris_91]

You guys recommending the JK BMS need to watch these YT videos . Faults have been found with them that could potentially damage batteries or cause a fire.
If the BMS is turned off for a day or two the software reverts back to default settings , they lose all the pre-programmed parameters and a few other small issues that JK didnt fix 100 % yet , maybe they will fix it given time , or ???.

I installed the previous version of the JK BMS after watching the off grid garage and they have been working flawlessly for a couple of years now.

 

[<-&->]

Thanks for this. To make sure I'm understanding right, have you connected your Victron to the 6mm + - battery terminals and are charging through the batteries on board BMS?
Or are you charging through the 8mm terminals which bypass the onboard BMS?

Yes , i connected a Victron SmartSolar MPPT to the 6mm terminals but i am only charging one battery at a time , i have 6 of these in a stack but didnt put bus bars between them yet , i need to establish a clearer definition of the parameters and function between inverter CANBUS and what the battery needs to function reliably.

I need to clarify that my Victron protocol (Cerbo GX , VENUS OS , EKRANO GX , Raspberry Pi , RS485 , RS232 , TTL ,MODBUS is compatible with the battery without any other interface.
There are guys who have connected Arduino CAN readers to the Samsung SDI but they appear to be read only.

 

[Boris_91]

Yes , i connected a Victron SmartSolar MPPT to the 6mm terminals but i am only charging one battery at a time , i have 6 of these in a stack but didnt put bus bars between them yet , i need to establish a clearer definition of the parameters and function between inverter CANBUS and what the battery needs to function reliably.

I need to clarify that my Victron protocol (Cerbo GX , VENUS OS , EKRANO GX , Raspberry Pi , RS485 , RS232 , TTL ,MODBUS is compatible with the battery without any other interface.
There are guys who have connected Arduino CAN readers to the Samsung SDI but they appear to be read only.

That's very helpful to know thank you.
Are you connecting your Victron MPPT via data connection to the batteries during charging or just charging straight through the +- terminals without data connection and the battery on board BMS working as stand alone protection?
I ask as I have Midnite MPPT, not Victron.

 

[<-&->]

That's very helpful to know thank you.
Are you connecting your Victron MPPT via data connection to the batteries during charging or just charging straight through the +- terminals without data connection and the battery on board BMS working as stand alone protection?
I ask as I have Midnite MPPT, not Victron.

There is no data connection between my Victron and anything else ,it is running as a dumb system .
The MPPT is purely supplying charge to those BMS equiped 6 mm terminals.
As a standalone with one battery i think that can work providing you dont pull too much C-rate out of the battery with the inverter load.
The MPPT also has to be programmed with Bulk set to maximum 58.1 Volts and Float to 51.52 .
Once an MPPT is connected , On the two DIP switches , the bottom of the two (Module ID) needs sw 7 flicked up to on position , then press and hold the red button for 5 seconds , The battery will then turn on.
.
Where it gets more sophisticated is if you have more than one of these batteries in parallel , then each one should have the CAT 6 cable connecting each battery as per the manual , and a CANBUS controller plugged in to the battery with ID-1 that talks to the inverter and prevents excessive discharge.

 

[Boris_91]

Perfect thank you. I'll be very interested to learn when someone converts the CAN to BYD output or similar. There are some common battery types that many inverters will communicate with but I have no experience with CAN bus so would be better off buying a confirmed conversion solution rather than getting it wrong myself.

 

[<-&->]

Perfect thank you. I'll be very interested to learn when someone converts the CAN to BYD output or similar. There are some common battery types that many inverters will communicate with but I have no experience with CAN bus so would be better off buying a confirmed conversion solution rather than getting it wrong myself.

I learnt something today , The Victron Cerbo system is quite a sophisticated monitoring and control device but its basically just a very small computer which runs software called Venus OS , it happens to cost around $ 700 AUD including the screen.
You can download the Venus OS (operating system) and install it onto a Raspberry Pi , connect it to a screen of which there are many available and you will get the same function display screen as the Cerbo GX , then connect it to a CAN-HAT board , program it and connect it to a BMS reader / controller board or inverter.
There are hundreds of youtube videos explaining the many options and opinions , I am still working through them but the possibilities are almost endless.

To be continued ...

 

[Boris_91]

That's brilliant. If some clever person has already written the code to upload to the CAN-HAT and the wiring is simple enough, most of us would be able to wire something together, upload the code and then utilize the batteries on board communications.
Do you know if this can be applied to different inverters such as Selectronic?
The Selectronic requires you connect to a known supported battery type such as BYD so the communication code coming from the batteries would need to look to the Selectronic like you were connecting to a supported battery brand.

 

[Boris_91]

Have done some research. I think this is a non-starter for communication with Selectronic. The only li-ion battery (not LFP) in the approved Selectronic list looks to be LG Chem including a rack mount but if you don't have the 2i model, you need to buy an additional communications board + cable + apply firmware update. Significantly more work than connecting to your Victron setup.

 

[<-&->]

Has anyone been successful in getting Samsung to reply to emails for support on these batteries ?

I sent emails to every email contact i could find published and the emails either bounced as being dead accounts or they just didnt reply at all which is pretty piss poor for a company like Samsung.

 

[Boris_91]

Has anyone been successful in getting Samsung to reply to emails for support on these batteries ?

I sent emails to every email contact i could find published and the emails either bounced as being dead accounts or they just didnt reply at all which is pretty piss poor for a company like Samsung.

Yep. They replied to me. Said they don't retail these batteries in Aus so have no information for me.

 

[<-&->]

Yep. They replied to me. Said they don't retail these batteries in Aus so have no information for me.

Okay . Their website using geolocating and blocks me from finding other overseas support bases but thats probably the best way , bypass the location tracking and get a tech support in Singapore , Malaysia or somewhere in europe , they will have the same inverter brands that we do.

 

[mynamebestname]

Samsung ELPM482-00005 · mr-manuel venus-os_dbus-serialbattery · Discussion #84

Uploading 4.84kWh_Standard_Product_Specification(1)[92].pdf…

github.com

There is a thread to get the Samsung BMS written into the custom driver to connect USB to RS485. Throw some love towards it and we will get it fully integrated into the Victron GX universe.

 

[Dorinel]

If anyone is interested i have a 48page PDF instruction and installation manual for these units.

Hello! will you be kind to send me the manual? TNX in advance!

 

[mynamebestname]

Hello! will you be kind to send me the manual? TNX in advance!

M

Samsung SDI ELPM482-00005 Manual

Nov 5, 2024

Manual for ELPM482-00005 Battery with integrated BMS. Includes RS485 and CAN definitions

• mynamebestname
• BMS

 

[Dorinel]

M

Samsung SDI ELPM482-00005 Manual

Nov 5, 2024

Manual for ELPM482-00005 Battery with integrated BMS. Includes RS485 and CAN definitions

• mynamebestname
• BMS

Thanks a lot!

 

[Dorinel]

Has anyone been successful in getting Samsung to reply to emails for support on these batteries ?

I sent emails to every email contact i could find published and the emails either bounced as being dead accounts or they just didnt reply at all which is pretty piss poor for a company like Samsung.

Contacted them for Italy support no answer yet...

 

[Dorinel]

I have two batteries, both showing BMS errors (LED blinking)). I suspect the BMS units are either faulty or in protection mode as swapping them causes the LED blinking to shift. If the fault were genuine, the blinking pattern would remain the same for each battery.
Also wondering if is any possibility to connect the pc with BMS board in order to read real time status and errors, maybe create a log file etc...

Any suggestion?

 

[Dorinel]

Is there any supplier that can provide only the BMS for this battery pack? I'd like to know if the price worth or better look for other brand BMS. (sorry for my english )

TNK in advance!

 

[Husk]

Bit weird to ask but has anyone seen these in full set up working state

 

[Husk]

Hi, I am in the same boat, same batteries. I am considering a Deye 8kW single phase for it. Working on the comms between Samsung and Deye at present.

Hey, how did you get on with marrying Samsung and Deye...