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Dyness BX51100 - is the BMS faulty


Douw Gerber
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Hi all

I just recently had a system installed with a Dyness BX51100 battery

I am running SolarAsssitant to monitor things.

The battery info is giving really weird results - could the BMS of the battery be faulty? See the reading on pack 1.

image.png.bf6abe43bf620d86480086f3167396ed.png

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You have two of these batteries?
Are the dip switches set correctly?
The 400A by itself with zero voltage and zero Watts is an indication of some sort of comms issue. Yes, it could be the BMS, but it could also be the comms connection to the inverter or dip switches not set correctly.
Have you tried disconnecting the comms cable from the battery, then manually set your inverter in USE mode or non Li mode and set all voltages according to battery specs. Reboot the system and batteries and see if the battery readings in SA change afterwards. 

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2 minutes ago, Douw Gerber said:

Hi all

I had to upgrade to a beta release of the SolarAssist software.  All seems fine now excep that it reads the battery as 50Ah. But capacity SOC and Voltage readings look normal now at least.

image.thumb.png.58f7d222c5176614efa3258501966f2e.png

Hownare the batteries connected to the inverter and Solar Assistant? Only asking because I have some challenges getting the SA connection going on my end

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Posted (edited)
20 hours ago, mzezman said:

Hownare the batteries connected to the inverter and Solar Assistant? Only asking because I have some challenges getting the SA connection going on my end

Via a cable I ordered from SolarAssistant - Rasberry PI USB to Battery RS485 port

 

Edited by Douw Gerber
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20 hours ago, Douw Gerber said:

Hi all

I had to upgrade to a beta release of the SolarAssist software.  All seems fine now excep that it reads the battery as 50Ah. But capacity SOC and Voltage readings look normal now at least.

image.thumb.png.58f7d222c5176614efa3258501966f2e.png

SA got back to me to confirm that the Dyness reports 50AH but they are working on a fix for this.  Its doesn't affect the battery runtime.

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Aaah ok, then thats the issue i have. Will disconnect that one and use the SA one and see how thay goes.

How does the inverter then know how to manage the battery though with the bms 'disconnected' for lack of a better word

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On 2022/08/07 at 11:25 AM, mzezman said:

Aaah ok, then thats the issue i have. Will disconnect that one and use the SA one and see how thay goes.

How does the inverter then know how to manage the battery though with the bms 'disconnected' for lack of a better word

The battery is pretty much managed by SA using the automatic power management features. 

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