Rebel 48v Battery Bank... help... ** THANKS FOR THE HELP ALL! *** problem solved

[yachtdr22]

Greetings all,
I have a 20kW Panel system into a Paralleled pair of Sol-Ark 15kW
with 5) 48v x 100a ReBel batteries. (2mos old)
I need another 200a of battery and ReBel are not available.
I am kinda BMS ignorant and have been reading up.
I wanted to add 2) of another brand but have been told that I can not mix BMS's ??
I am thinking my only choice now is to cut apart one of the batteries (I already had to bust one open for a failed Bluetooth switch which disabled the battery)
to identify the exact cells and get the same BMS ?
Suggestions?
Thanks in advance,
Drew

 

[Supervstech]

Same battery chemistry and same module size shouldn’t be an issue with different brands, IF all are tied to a common bussbar appropriately sized and fused.

 

[fratermus]

to identify the exact cells and get the same BMS ?

I don't know about the 48v ones but Rebel uses JBD on other batteries. Including a 48v test run of rackmounts.

Perhaps @ashelby can chime in, as the datasheet for the 48v hasn't been posted yet.

 

[yachtdr22]

I don't know about the 48v ones but Rebel uses JBD on other batteries. Including a 48v test run of rackmounts.

Perhaps @ashelby can chime in, as the datasheet for the 48v hasn't been posted yet.

It has taken Aric 2 weeks to respond and he has said they have no more in stock and no more on order.
I know this is the BMS because of a failed Switch.

 

[yachtdr22]

Same battery chemistry and same module size shouldn’t be an issue with different brands, IF all are tied to a common bussbar appropriately sized and fused.

I am not sure of the battery chemistry. yes, all bussbar connected. w/ 100a protection for each battery
I think today project will be to dissect the one already opened up for cell identification

 

[Supervstech]

LiFePO4 is a chemistry.
LiNMC is a chemistry
Lead acid
AGM
NiFe
Etc…

 

[Nobodybusiness]

It has taken Aric 2 weeks to respond and he has said they have no more in stock and no more on order.
I know this is the BMS because of a failed Switch.

That’s a JBD BMS.
Did you have those batteries connected to master inverter?


You do not have to run all batteries closed loop with a cable from battery to BMS.

You can use any LIFEPO4 48V battery and run Voltage control from inverter if you can’t get them to communicate Closes loop.

 

[yachtdr22]

LiFePO4 is a chemistry.
LiNMC is a chemistry
Lead acid
AGM
NiFe
Etc…

They say they are LiFePO4
are there different versions of LiFePO4 chemistry?
I do appreciate the info....

 

[yachtdr22]

That’s a JBD BMS.
Did you have those batteries connected to master inverter?

5x 48v / 100a to bussbar (Paralleling the bank) out to both Sol-Ark inverters as per their diagrams.

You do not have to run all batteries closed loop with a cable from battery to BMS.

Please explain? The Rebel batteries have only BT connection, no communication to inverter

You can use any LIFEPO4 48V battery and run Voltage control from inverter if you can get them to communicate Closes loop.

 

[yachtdr22]

I wanted to just drop 2) EG4's into the system but was told they are not compatible?

https://signaturesolar.com/eg4-lifepower4-lithium-battery-48v-100ah/

 

[Nobodybusiness]

5x 48v / 100a to bussbar (Paralleling the bank) out to both Sol-Ark inverters as per their diagrams.

Please explain? The Rebel batteries have only BT connection, no communication to inverter

Then you have nothing to worry about. Just get another 48v 200ah battery from like Trophy and put it in parallel with the others.

Sound like you are using voltage control now since you don’t have batteries connected to the inverters via Can or 485.

 

[Nobodybusiness]

I wanted to just drop 2) EG4's into the system but was told they are not compatible?

https://signaturesolar.com/eg4-lifepower4-lithium-battery-48v-100ah/

The BMS might not be compatible but apparently you are not using them for Current control so it won’t matter.

The BMS control each individual battery and they CAN talk to inverter to control charge current BUT you said they are NOT communicating with your inverter currently.

 

[Nobodybusiness]

It has taken Aric 2 weeks to respond and he has said they have no more in stock and no more on order.
I know this is the BMS because of a failed Switch.

Look at your battery settings in your Master inverter.

Does is have BMS checked or not?

Does it have battery Voltage checked?

 

[yachtdr22]

Look at your battery settings in your Master inverter.

Does is have BMS checked or not?

Does it have battery Voltage checked?

I am NOT using BMS communications. I am using the Voltage & % of charge.

 

[Nobodybusiness]

I am NOT using BMS communications. I am using the Voltage & % of charge.

It’s usually one or the other. % or voltage.
Only one can be checked in the inverter.

You should be ok to add another battery in parallel then.

 

[yachtdr22]

It’s usually one or the other. % or voltage.
Only one can be checked in the inverter.

You should be ok to add another battery in parallel then.

thanks!

 

[Nobodybusiness]

thanks!

YW..

 

[yachtdr22]

Thanks for the help all!
This was a miscommunication about BMS compatabilities. Whew! Mischief Managed!