Battery Life setting for Pylontech5000C setup

DIY
, ,
1

Hi to all,

I have a Multiplus II 48V with a Pylontech 5000C setup which works well. Now with the starting fall I realized that having configured in ESS Optimized “with BatteryLife” ends up in an Active SOC Limit of 50% which means that the discharging process ends up very fast. Changing the mode to Optimized “without BatteryLife” will solve this issue. However I am wondering if this will do any harm to my Pylontech US5000C battery pack. Minimum SOC I adjusted to 25%.

Thanks.

2

Most Pylontech’s can be discharged 95%, so 5% SOC
However i would not recommend to keep it that empty during fall/winter

My own system have pylontechs with battery life activated and my standard minimum SOC is 40% to keep some backup power

so it will slowly increase the minimum SOC during fall/winter, im just leaving it like that works for me

1 Like
3

Hello Marc,

I have a question about the minimum 5% SOC on Pylontech US5000. Whenever the charge goes below 10% (happens if min. 5% SOC set), I get low voltage alert from the system so I keep the minimum at 10%. Have you ever experienced a similar issue with your Pylontechs?

Regards

4

Hi @danger365
As long as you don’t go below 20% SOC, you’ll be fine.
Maximum life is given for 25*C operating temperature and max. 80% DOD.

5

LFP batteries will live longer (have a high state of health) in the following cases:

  1. You do not charge/discharge them on high current, ideally no higher than half their maximum current allowed. If you have 100A maximum current keep it around 50A or less. Based on this larger batteries banks has less load than one-two batteries setup
  2. You do not fully discharge them
  3. You balance the battery from time to time by charging it to 100%
2 Likes
6

Pylontech us series have a 6000cycle min for max 95% discharge

7

Hi i have never had them below about 25% so dont know :blush:

1 Like
8

95% - 800
80% - 6000

:slight_smile:

1
1496×301 18.4 KB

9

Thats not what the manuals says, its even 95% @ 8000 cycles…

They even give warranty on that for 10 years

10

I may be wrong and you may be right…

The above graph is the performance test of the Pylontech’s PF25N pouch cell.
Who knows, maybe they’ve improved the chemistry and/or manufacturing process.

Still, if you extrapolate the above graph for 8000 cycles, it can be concluded that if you stop the discharge at 75% DOD (25% SOC), you can hit easily hit 8000 cycles.

The manual states that recommended maximum depth of discharge is 95%.
Then, on a separate line, it states that it can have over 8000 cycles at 25*C.
But for sure those 8000 cycles are not at maximum 95% DOD.

At least this is in the current manual for US5000 from the Pylontech site.

11

They do have become better then previous versions! Pylontech keeps improving them

The discharge is recently changed from former 90% to 95%

Cycles used to be >6000 and is now >8000

Warranty is extended from 3 to 10 years

Design life is now +15 years

Maybe we are both right and wrong :wink:

1 Like
12

Maybe we should ask pylontech what te current “warranty” is :blush:

13

:+1:
You’re right!
Let’s enjoy them without discharging then below 25% and hope they will last more than 10 years!
Now that Victron pamper them with a variable CVL charging algorithm, for sure they will last that long!

1 Like