Proper process for balancing two Dyness batteries

[wingnut771]

Yea imagine cable comes from inverter to first battery same lentgh cable goes from one battery to the next ?

That is double the distance

Engineers can try and solve the problem , end users will find a way

If anything, its the new battery with a longer cable and yet this is the one with the lower SOC leds.

 

[leon.davibe]

How do you do that?

Some inverters will show the cell voltages i think deye and sunsynk can do tjis

Not sure if they can few individual batteries though maybe just the master

What i would do if i was origjnal poster switch the system off

Disconnect the batteries

Swop the batteries put the one in the others spot

if the problem stays on the same position not battery then it is cable lentghs

If the problem follows the battery
Then it is battery

I think this is a cable piggy back problem

 

[denmendez65]

If anything, its the new battery with a longer cable and yet this is the one with the lower SOC leds.

Yeah, the one with the short leads to the inverter, the battery on the right, will supply the most current to the inverter and get charged the quickest.

The one on the left will get the least charge and supply the least current. Looks like a probable explanation as to why his 1st battery is fuller than the second one. I didn’t see the pics

 

[denmendez65]

Yeah, the one with the short leads to the inverter, the battery on the right, will supply the most current to the inverter and get charged the quickest.

The one on the left will get the least charge and supply the least current. Looks like a probable explanation as to why his 1st battery is fuller than the second one. I didn’t see the pics

 

[wingnut771]

View attachment 1861951

Busbars FTW!

 

[wingnut771]

Yeah, the one with the short leads to the inverter, the battery on the right, will supply the most current to the inverter and get charged the quickest.

The one on the left will get the least charge and supply the least current. Looks like a probable explanation as to why his 1st battery is fuller than the second one. I didn’t see the pics

This contradicts that.
Left battery:

Right battery:

 

[denmendez65]

Busbars FTW!

Yeah, even the diagonal method has been shown not to be the best. Still leads to imbalances, but it's way better than just doing positive to positive and negative to negative between batteries.

 

[denmendez65]

This contradicts that.
Left battery:
View attachment 1861952
Right battery:
View attachment 1861953

Whats the contradiction?

 

[wingnut771]

Whats the contradiction?

The one furtherest away from the inverter is supplying most of the current (which is why it has a lower soc).

 

[denmendez65]

The one furtherest away from the inverter is supplying most of the current (which is why it has a lower soc).

No. It is supplying the least. The lower SOC is because it also gets the least charge.

 

[leon.davibe]

View attachment 1861946

I would switch the system off

Disconnect the batteries and put the left one on the right and the right one on the left
(Will have to take a photo of dip switches and change to match position )

If the problem stays in the same position ie right battery still charges faster

Then the problem isn't battery related but cable distances

If the problem migrates with the battery then it
is battery related

 

[wingnut771]

No. It is supplying the least. The lower SOC is because it also gets the least charge.

but they both start at 100%.

 

[denmendez65]

The one furtherest away from the inverter is supplying most of the current (which is why it has a lower soc).

Straight from the Victron manual (Same principle for an battery bank)

 

[wingnut771]

I would switch the system off

Disconnect the batteries and put the left one on the right and the right one on the left

If the problem stays in the same position ie right battery still charges faster

Then the problem isn't battery related but cable distances

If the problem migrates with the battery then it
is battery related

Too much faf. I will just wash my hands of it and add another battery in (checks notes: 6000 divide 365) 16.43 years.

 

[leon.davibe]

View attachment 1861951

Yea it looks like he has diagonal connection

 

[wingnut771]

Straight from the Victron manual (Same principle for an battery bank)
View attachment 1861957

I'm aware, where is the inverter in the pic?

 

[denmendez65]

Too much faf. I will just wash my hands of it and add another battery in (checks notes: 6000 divide 365) 16.43 years.

Leons suggestion is the easiest method though. Just swap the batteries and see if the issue follows. They you can rule leads, etc completely if the problem doesnt migrate.

 

[denmendez65]

I'm aware, where is the inverter in the pic?

Bottom. It says "To the installation" so the bottom battery is the one closest to the inverter. In the OPs case, the one on the right which is being charged and discharged the most.

 

[wingnut771]

Leons suggestion is the easiest method though. Just swap the batteries and see if the issue follows. They you can rule leads, etc completely if the problem doesnt migrate.

 

[wingnut771]

Bottom. It says "To the installation" so the bottom battery is the one closest to the inverter. In the OPs case, the one on the right which is being charged and discharged the most.

Not your victron pic. Hannos pic.

The one on the right is getting discharged the least.