KS Energy battery info

[rupert]

yes on a few occasions, but not this time as I'm confident voltage is in the same ball park

 

[Ditcha]

How can 11.8V be 64% SOC ? Our Fogster parameters say 13.08 for 20% SOC.
It may not be identical but 11.88v is flat surely?

View attachment 752289

10.6v is normally empty.

 

[irnbru]

What does the voltmeter say

Edit....maybe worth disconnecting and completely discharging and then fully charging ?
Stupid question but you do.have the right app don't you..I downloaded the wrong one at first and had to download the one for the "compact range" or summat. Version 2 I think. It does say which on the online instructions.

How can 11.8V be 64% SOC ? Our Fogster parameters say 13.08 for 20% SOC.
It may not be identical but 11.88v is flat surely?

View attachment 752289

Exactly my point!

 

[Vansflyer]

10.6v is normally empty.

Is the the KS figure? Fogster say 11.2V so I guess there must be some difference in the BMS ?

 

[Vansflyer]

Exactly my point!

So do KS give a chart with what the voltages should be at different SOC?

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[Ditcha]

Is the the KS figure? Fogster say 11.2V so I guess there must be some difference in the BMS ?

Not sure about KS as I think they are cylindrical cells, with prismatic cells as you have with fogstar you can take them down to 2.65v per cell 10.6v combined, fogstar must have the BMS set to 2.8v per cell 11.2v combined given you roughly about 5% discharge floor.

 

[Vansflyer]

Not sure about KS as I think they are cylindrical cells, with prismatic cells as you have with fogstar you can take them down to 2.65v per cell 10.6v combined, fogstar must have the BMS set to 2.8v per cell 11.2v combined given you roughly about 5% discharge floor.

Thanks for the info, appreciate it.

 

[Bustup15]

The most difference is one cell by 0.01 .

What discharges the battery to 64%? You seem to be moving regularly and often with EHU on the Aires.

 

[peterc10]

I'm booked in for a bit of upgrading in a few weeks and part of that is dropping in a couple 125ah KS compacts.

I know they have the bluetooth feature so I presume you download an app and you can use that to find all the info. What information does it tell you? Is it accurate? Any screenshots?

The reason I ask is because I bought a couple Victron battery smart sense units before my old batteries went duff. Is there any point sticking them on during install?

I like the Victron connect app for readings from my shunt and MPPT but will it all be a bit redundant now with the KS app?

I have 2 x 120Ah KS batteries. For historical and practical reasons I have a mixture of Victron and Votronic charging and monitoring gear. A Votronic solar regulator for part of my solar array and a Victron regulator for the rest, a Votronic B2B, a Victron IP22 mains charger and a Victron BMV700.

I use the KS app to monitor each individual battery. I use the Victron BM 700 to monitor the overall system. Also look occasionally at the what the Victron solar charger is doing and can interperlate what the other regulator is doing. I rarely have the mains charger on and, of course, when the B2B is on I am driving so don't do any monitoring.

Works OK for me.

 

[rupert]

What discharges the battery to 64%? You seem to be moving regularly and often with EHU on the Aires.

Hi Neil. discharge was deliberate. KS asked me to charge fully and send screen shot.
After I did that (again) I isolated the battery from charge and discharged for 4 hours at 20amp then10amp for about 4 hours to flat
ie. bms stopped discharge at 10.6 v
then charged with onboard charger + solar giving around 20amp... SOC reached 27% then jumped up to 100%
KS have now said they will send returns label for when I get home to send battery back for testing.
I'm just hoping I still got original box for packaging
I'll keep you updated.... Alan

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[MichaelT]

And by 10.24 we are at zeroView attachment 752249

Click the little badge in top right corner to see if any protection by BMS.

 

[irnbru]

Click the little badge in top right corner to see if any protection by BMS.

There isn’t any badge there. Maybe your app is the number 2 version which didn’t show anything for us at all.

 

[MichaelT]

There isn’t any badge there. Maybe your app is the number 2 version which didn’t show anything for us at all.

Yes No 2 version is the correct one.

 

[irnbru]

Yes No 2 version is the correct one.

Maybe for you but the app states it’s only for the bluetooth compact series and just doesn’t read any figures at all. We need to use version 1

 

[peterc10]

Yes No 2 version is the correct one.

It depends upon which battery you have. The instructions KS provide for each battery will tell you whether you should be using Version 1 or Version 2 of the app. Mine requires version 2, which has the badge, which takes you to the protection record screen. Mind you I don't understand what it is showing when I do go there.

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[Hoovie]

This KS Energy battery malarky sounds like owners have a full-time hobby just messing around with the battery

(I have a friend with one and he never has a real idea what the battery SOC is, the way it bounces around and turns itself off under minimal load. He actually leaves his inverter switched on just to keep a bit of load on the battery so it stays awake )

 

[MichaelT]

This KS Energy battery malarky sounds like owners have a full-time hobby just messing around with the battery

(I have a friend with one and he never has a real idea what the battery SOC is, the way it bounces around and turns itself off under minimal load. He actually leaves his inverter switched on just to keep a bit of load on the battery so it stays awake )

We've had ours for 18 months and never had an issue. Always seems to show correct readings based on usage. We only have the battery fitted no other victron or b2b stuff and only use the app to see.

 

[MichaelT]

Maybe for you but the app states it’s only for the bluetooth compact series and just doesn’t read any figures at all. We need to use version 1

Well ours is the underseat one and version 1 did not work as it showed loads of cells instead of 4 and readings were weird if I remember.

 

[peterc10]

Well ours is the underseat one and version 1 did not work as it showed loads of cells instead of 4 and readings were weird if I remember.

The underseat ones are the compact versions, which is why you have to use Version 2 of the app.

 

[Ditcha]

The underseat ones are the compact versions, which is why you have to use Version 2 of the app.

Different apps working with different batteries suggest to me different BMS in their batteries or at least different Bluetooth comms.

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[Tombola]

We've had ours for 18 months and never had an issue. Always seems to show correct readings based on usage. We only have the battery fitted no other victron or b2b stuff and only use the app to see.

Same tbh though as everything lithium these things are dropping in price all the time

 

[Raul]

Ok these first ones were taken at 10.09am

View attachment 752246 View attachment 752247

That tells me you battery is nearly empty, under 12v you haven’t got much before low cell disconnect will cut off discharge. You need to fully charge and long saturate your battery to help balance the cells and reset to 100% SOC. cells balanced at very top counts, anything other than that is meaningless.

 

[irnbru]

That tells me you battery is nearly empty, under 12v you haven’t got much before low cell disconnect will cut off discharge. You need to fully charge and long saturate your battery to help balance the cells and reset to 100% SOC. cells balanced at very top counts, anything other than that is meaningless.

Thanks but when it gets to 14.4v the bus kicks in and stops it charging.

 

[Raul]

What brings it to 14.4v? The solar? The b2b? Or ehu?
I don’t know what you mean by bus.

 

[irnbru]

Sorry, predictive text, should’ve read BMS .

It’s got to 100 percent a few times via the EHU and solar at other times along with b2b when travelling. Been monitoring it for past few weeks.

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[Hoovie]

Thanks but when it gets to 14.4v the bms kicks in and stops it charging.

The various Lithiums I have had, by the time the charge voltage has got to 14.4V, the battery is fully charged.
In fact, by the time the voltage gets to 14.2V, they are full (I have my VSDR configured to disconnect my Lithiums when the voltage hits 14.2V as best not to leave them at float).

 

[Raul]

Sorry, predictive text, should’ve read BMS .

It’s got to 100 percent a few times via the EHU and solar at other times along with b2b when travelling. Been monitoring it for past few weeks.

Ok, when it reaches 14.4v, the bms cuts out due to high cell voltage. One of the cells it’s activating the HVD and cuts charging. The bms monitors the pack at cell voltage, not pack voltage; the 14.4v means 3.65v per cell, only when the battery is balanced. When one cell reaches 3.65v, regardless of pack voltage, it will cut out the charge. Hence depleting quick, you need to see the cell voltageges exactly when battery reaches 14-14v, before it disconnects.

 

[Raul]

The various Lithiums I have had, by the time the charge voltage has got to 14.4V, the battery is fully charged.
In fact, by the time the voltage gets to 14.2V, they are full (I have my VSDR configured to disconnect my Lithiums when the voltage hits 14.2V as best not to leave them at float).

If it’s been partially cycled, it can be unbalanced. One cell will dictate capacity. Op here complains about SOC.

 

[irnbru]

Ok I will try that, just plugged it back in to EHU
It’s currently 94 percent and cells are3.39 each

 

[Raul]

After 3.45v it will raise fast. If bms cuts out, means your charger has CV to high set. And has no time to absorb or balance.

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