Can Highstar LFP 314Ah Cells Handle 1C Continuous Discharge?

[zee123king]

Hi everyone,


I'm planning an ESS rack project and have to deal with Highstar LFP 314Ah prismatic cells. They look solid, but I'm scratching my head over the discharge specs in the datasheet (I'll attach it below for reference).


From what I can see, the max continuous discharge isn't explicitly stated in amps or C-rate. For a 314Ah cell, 1C would be around 314A, right? Is this safe for continuous use, or should I derate it to something lower like 0.5C to be safe? For my project, I may need a continuous discharge current of up to 230A (for a 60kW inverter), so I'd really appreciate advice on whether these cells can reliably handle that without issues.


Also, there's no mention of peak discharge current at all—anyone know what a reasonable peak might be for these cells (e.g., 2C or 3C burst)? I'd love to hear from folks who've tested or used Highstar cells in real setups.


Any insights, experiences, or recommendations for this would be awesome too. Thanks in advance!

 

[Korishan]

Looks like it's rated for 0.5C. Even tho this shows "P", I think it's a typo because the next graph shows "C" in that same spot.
Correction, that must be because it was originally show in Japanese and that's the letter they use

Source https://en.highstar.com/Batteries

Here's another datasheet entry:

Found it from here: https://diysolarforum.com/threads/continuous-discharging-current-of-highstar-314ah-cell.115579/

 

[zee123king]

View attachment 33718Looks like it's rated for 0.5C. Even tho this shows "P", I think it's a typo because the next graph shows "C" in that same spot.
Correction, that must be because it was originally show in Japanese and that's the letter they use

Source https://en.highstar.com/Batteries

Here's another datasheet entry:
View attachment 33719Found it from here: https://diysolarforum.com/threads/continuous-discharging-current-of-highstar-314ah-cell.115579/

Yes .. I see .. seems better running at 0.5C.. can't risk running at 1C even though it is explicitly mentioned.. Also cells from other manufacturer all rated at max. 0.5C

 

[Korishan]

This is what I posted on diysolarforum:

--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Here's my viewpoint on the document
Standard Discharge Current is referring to the continuous discharge current
Max Discharge Current is referring to the short bursts that usually lasts only a few seconds.

So, in 3.3.3 is says "Standard Discharge Current" is 0.5P, which would be 157A continuous
In 3.3.6 is says "Maximum Discharge Current" is 1.0P in most operating temperature ranges.

So with this, I would gather that the maximum current in bursts is 1C, or 315A for only a few seconds. Whereas continuous discharge would be around 0.5C, or 157A.
This is a pretty standard discharge rates for most lithium based cells.

I will say though that Highstar should be a little more descriptive in their explanation of what they are referring to in Maximum Discharge, time reference should really be listed as well.

Altho, what really confuses me is this part:

Why would we discharge to 3.65V and then wait 30mins?? 100% SOC is 3.65V. I wonder if they meant 2.65V as 2.5V is the bottom voltage in the datasheet.
Or, they just copied the text from the "Charging" section and didn't update to the discharge value, which is quite possible as well.

 

[zee123king]

This is what I posted on diysolarforum:

--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Here's my viewpoint on the document
Standard Discharge Current is referring to the continuous discharge current
Max Discharge Current is referring to the short bursts that usually lasts only a few seconds.

So, in 3.3.3 is says "Standard Discharge Current" is 0.5P, which would be 157A continuous
In 3.3.6 is says "Maximum Discharge Current" is 1.0P in most operating temperature ranges.

So with this, I would gather that the maximum current in bursts is 1C, or 315A for only a few seconds. Whereas continuous discharge would be around 0.5C, or 157A.
This is a pretty standard discharge rates for most lithium based cells.

I will say though that Highstar should be a little more descriptive in their explanation of what they are referring to in Maximum Discharge, time reference should really be listed as well.

Altho, what really confuses me is this part:
View attachment 33720

Why would we discharge to 3.65V and then wait 30mins?? 100% SOC is 3.65V. I wonder if they meant 2.65V as 2.5V is the bottom voltage in the datasheet.
Or, they just copied the text from the "Charging" section and didn't update to the discharge value, which is quite possible as well.

Yes.. they have been quite many mistakes in their datesheets.. some points have been concealed either intentionally or by mistake.. to create some confusion and boost sales... Not worth a shot for project failure

 

[Korishan]

yeah, if sketchy like that, better to go with a known brand. Eve, Calb, Goshin to name a few

I have the Goshin ones, and they've been spot on after their initial balancing. And I run them pretty hard at the top/bottom end for right now, squeeze every bit out of them. 2nd batch on the way, should be here by the end of next week I hope.

But I do only go to a max charge of 150A and they chugged along without issues

 

[zee123king]

yeah, if sketchy like that, better to go with a known brand. Eve, Calb, Goshin to name a few

I have the Goshin ones, and they've been spot on after their initial balancing. And I run them pretty hard at the top/bottom end for right now, squeeze every bit out of them. 2nd batch on the way, should be here by the end of next week I hope.

But I do only go to a max charge of 150A and they chugged along without issues

Yes thanks.. a good suggestion