Battery advice

[Bruceg]

Hi,
I have 3 pylontech us3000 batteries in my system, do I add one more or replace them with a Dyness 14,3 kw battery
Have 2 us3000 and 1 us3000c

 

[Speedster]

Hi,
I have 3 pylontech us3000 batteries in my system, do I add one more or replace them with a Dyness 14,3 kw battery
Have 2 us3000 and 1 us3000c

How old are the Pylons? Cheapest will obviously be adding just the one more.

 

[wingnut771]

Add another pylon but make new battery the master. @AchmatK has 6 I think.

 

[wingnut771]

How old are the Pylons? Cheapest will obviously be adding just the one more.

Does it matter?

 

[Speedster]

Does it matter?

Well, kind of. If the SoH of the older batteries is say 80%, I'd strongly consider replacing them.

 

[Bruceg]

Soh is 99% less than 400 cycles, us 300 around 4 yrs old, us3000c about 2 years old

 

[Speedster]

Soh is 99% less than 400 cycles, us 300 around 4 yrs old, us3000c about 2 years old

Then I'd definitely just add another one.

 

[wingnut771]

Well, kind of. If the SoH of the older batteries is say 80%, I'd strongly consider replacing them.

Why?

 

[Speedster]

Why?

Internal resistance issues

 

[wingnut771]

Internal resistance issues

Why is that an issue? The new battery will have the lower resistance so will take load away from old batteries. One of the reasons why you rotate the new battery in as the master.