Proper process for balancing two Dyness batteries

Hanno Labuschagne said:
Cannot seem to find a way to view the individual voltages on the batteries on the Deye, but I may also just be stupid. Will post some photos for reference.
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In the words of our esteemed geyser and lpg generator guy
eda7de7d55c046488e0961ff4078a025
 
Seems minimum Deye will allow me to go is 11% but I know a lot of the management is done BMS side, so will see. Dropping down to minimum know and will charge up to 100% and hold there for a bit to see if it sorts out of the issue.

But thanks a lot for the assistance, really helps put one's mind at ease.
 
Hanno Labuschagne said:
Seems minimum Deye will allow me to go is 11% but I know a lot of the management is done BMS side, so will see. Dropping down to minimum know and will charge up to 100% and hold there for a bit to see if it sorts out of the issue.

But thanks a lot for the assistance, really helps put one's mind at ease.
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I would try AGM mode on the deye so inverter will only look at voltage. Maybe "11%" is incorrect because the BMS is SOC is out. What is the voltage at 11%?
 
Hanno Labuschagne said:
Been having dreams about one of those.
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Just buy a cheapie it will be accurate enough for the information you need.

If those lights are correct the battery probably lost a cell and you need to send it in for repair. A multimeter will give you a better idea if its something you need to worry about or not.
 
B-1 said:
Just buy a cheapie it will be accurate enough for the information you need.

If those lights are correct the battery probably lost a cell and you need to send it in for repair. A multimeter will give you a better idea if its something you need to worry about or not.
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1762592642124.png
 
Are the cables equal length? Or connected in an arrangement that allows equal charging and discharging?

It’s true in parallel that they should self balance but remember that if you are discharging the batteries, the one with the longest length cable gets discharged the least. And even with charging, one will charge up quicker than the other and the inverter will stop charging the bank.

I am coming from a LA background though. So not sure if the comms from the bms to inverter takes care of whoch batteries has its charge stopped and which one won’t.

Will powess did a video using lithium batteries and he showed that this phenomenon in a big problem also for multiple batteries in parallel with lithium also.
 
Just set your battery reserves to 100% and leave it for 24h hours.

You don’t need to do anything more than that.

If you have a Sunsynk or Deye inverter you can also tick the “Activate Battery” option while doing this.

IMG_2432.jpeg
 
The new battery might be faulty.

When I added a third Dyness ( same as yours ), it just never charged up fully no matter how many times the installer came.

Tried all things listed in this thread.

In the end the installer luckily replaced the battery and all 3 are now in sync
 
denmendez65 said:
Are the cables equal length? Or connected in an arrangement that allows equal charging and discharging?

It’s true in parallel that they should self balance but remember that if you are discharging the batteries, the one with the longest length cable gets discharged the least. And even with charging, one will charge up quicker than the other and the inverter will stop charging the bank.

I am coming from a LA background though. So not sure if the comms from the bms to inverter takes care of whoch batteries has its charge stopped and which one won’t.

Will powess did a video using lithium batteries and he showed that this phenomenon in a big problem also for multiple batteries in parallel with lithium also.
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Its not a big problem as they all get to zero % at the same time at the end of the day. The BMS (only monitors voltage, current and temp) has zero effect on the paralleling behaviour. This is all happens automagically due to the resistance. Even with cables of different lengths, they will still bottom out together and top out together, its inbetween where they will be different.
 
Hanno Labuschagne said:
Seems minimum Deye will allow me to go is 11% but I know a lot of the management is done BMS side, so will see. Dropping down to minimum know and will charge up to 100% and hold there for a bit to see if it sorts out of the issue.

But thanks a lot for the assistance, really helps put one's mind at ease.
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You are overthinking all of this.

Leave it on Lithium and set all your service mode schedules to 100% and then toggle Activate battery.

Leave it for 24H.

Then turn off Activate Battery and set your schedules as you prefer.

How do I know? I had 3 x Dyness batteries and then added a forth a year later.
 
SauRoNZA said:
You are overthinking all of this.

Leave it on Lithium and set all your service mode schedules to 100% and then toggle Activate battery.

Leave it for 24H.

Then turn off Activate Battery and set your schedules as you prefer.

How do I know? I had 3 x Dyness batteries and then added a forth a year later.
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Both batteries report 100% SOC when at 100% for 2 hours per day though? How does "activate battery" reset soc counter on dyness BMS?
1762595723260.png
 
wingnut771 said:
Both batteries report 100% SOC when at 100% for 2 hours per day though? How does "activate battery" reset soc counter on dyness BMS?
View attachment 1861771
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No idea how it works exactly, but it’s the recommended process when adding a new battery.

I think it just locks out any discharging and then pumps it to 100% from grid/solar and keeps it there.

The BMS then sorts itself out when all the batteries are completely 100% and balanced out.

Otherwise the collective array reports 100% too early and before all batteries are actually at that level and the inverter starts using it.

Had this exact same problem when I added my 4th battery.

Activate battery I seem to recall also forces the inverter itself not to be powered from the batteries.
 
SauRoNZA said:
Potentially a warranty out the window if you do that and it discharges beyond BMS limits.
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denmendez65 said:
Even then. The inverter will kill the charge before all the batteries are full
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That's why I posted this from the dyness specs:
1762599752362.png

They will have a tough time explaining the void warranty when the voltages never went out of this range.
 
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