Hi,

I've installed this solar system (Axpert King II named WKS Evo II in belgium / France) 3 years ago, with 3 Pylontech US2000.

This summer, I wanted to add some 2 more batteries but there's no US2000 any more and the distributor sold me 2 US2000C version.

It didn't worked until I had to set soem 'user' parameters. Still, it doesn't work properly : the reported load percentage in Watchpower keeps beetween 20% and 50% even when the batteries are fuly loaded.

I couldn't get anymore support from WattuNeed, the distributor, absolutely no support from Voltronic which doesn't answer to their e-mail, and I don't speak chinese so I don't even understand the phone answering machine, then nobody there hang the phone...

Back to my setup : i have upgraded once the firmware to 71,94 version and I don't know were to find the latest one.
For 3 years, the system with only 3 Pylontech US2000 worked properly, connected to the master battery with a straight RJ45cord (RS485 port, DIP 1 to 9600 bauds)
 

Does somebody here have experienced the same problems and found a solution ?

Best regards, 

Gwendal
 

On 2023/10/16 at 6:48 AM, Solar56 said:

Axpert King II named WKS Evo II in Belgium / France)

Are you sure it's an Axpert King II? The removable display [ edit: in an adveertisement for a similarly named inverter that I saw ] is hard to the left, as I would expect for an Axpert VM III. Also, they don't mention paralleling at all on the blurb sheet, another clue that it's a VM III.

On 2023/10/16 at 6:48 AM, Solar56 said:

i have upgraded once the firmware to 71,94 version

? That's generally an Axpert King 1 firmware, though there are several overlaps.

Does your setup include solar, and does it work? If so, what is a typical PV voltage?

Does your inverter have setting 10, Operation Logic (options AUt / OnL / ECO)? That's a sure sign of a King, either King 1 or King II.

If you are running totally the wrong firmware, that could explain a lot.

Edited October 17, 20231 yr by Coulomb

7 hours ago, Solar56 said:

Does somebody here have experienced the same problems and found a solution ?

My observation: From the pic i noticed that you put US2000C as first and last. They should be first and second (1.us2000c,2.us2000c,3.us2000,4.us2000,5.us2000)

IMO Setting for User bulk, absorption, float 51.8v and charge current should not exceed 125amps for entire battery bank (25amps/batt)

FYI You can also try upgrading the firmware on all the batteries

If you have not already, you should update the firmware on the US2000 to the latest version.

PM me if you require the .bin file.

 

4 hours ago, Coulomb said:

Are you sure it's an Axpert King II? The removable display is hard to the left, as I would expect for an Axpert VM III. Also, they don't mention paralleling at all on the blurb sheet, another clue that it's a VM III.

? That's generally an Axpert King 1 firmware, though there are several overlaps.

As I remember when I processed the firmware upgrade, this is an Axpert King II  (3 years agos, Wattuneed sold WKS Evo and WKS Evo II, the one I bought).

Here under some pics of the product (with it's WiFi module option).

4 hours ago, Coulomb said:

Does your setup include solar, and does it work? If so, what is a typical PV voltage?

8 x 300 watts, groups of 2, 76 V typical voltage

4 hours ago, Coulomb said:

Does your inverter have setting 10, Operation Logic (options AUt / OnL / ECO)? That's a sure sign of a King, either King 1 or King II.

I'm not on the site to check that (7h to drive and back) before 1 on 2 weeks

4 hours ago, Coulomb said:

If you are running totally the wrong firmware, that could explain a lot.

The firmware was given by Julien MAWET, the head of Wattuneed, main distributor of Voltronic in Europe...

4 hours ago, SYC said:

My observation: From the pic i noticed that you put US2000C as first and last. They should be first and second (1.us2000c,2.us2000c,3.us2000,4.us2000,5.us2000)

IMO Setting for User bulk, absorption, float 51.8v and charge current should not exceed 125amps for entire battery bank (25amps/batt)

FYI You can also try upgrading the firmware on all the batteries

Thank you for this idea. I followed the suggestion of my seller.
I may change this setup next time I'll go there.
I'll also lower the float value as you recommand.

2 hours ago, FixAMess said:

If you have not already, you should update the firmware on the US2000 to the latest version.

PM me if you require the .bin file.

 

I never updated any firmware on the batteries and, yes, I may consider this option too.
Is it this file ?

Is there another one for the previous version of the batteries and the process explained somewhere ?

Thank you all guys !

5 hours ago, Coulomb said:

 

Does your inverter have setting 10, Operation Logic (options AUt / OnL / ECO)? That's a sure sign of a King, either King 1 or King II.

If you are running totally the wrong firmware, that could explain a lot.

I just got the information : yes it has the 3 options you mentioned

Thank you for your support !

Edited October 16, 20231 yr by Solar56

19 hours ago, Solar56 said:

Here under some pics of the product

The display is in the correct position for a King.

19 hours ago, Solar56 said:

8 x 300 watts, groups of 2, 76 V typical voltage

Definitely a King 1 then.

19 hours ago, Solar56 said:

The firmware was given by Julien MAWET, the head of Wattuneed,

It's a King 1 firmware then. 71.94 (for Kings) is relatively recent; my notes say that it's the one where probably they had just fixed some PV dip and freeze issues.

Battery BMS problems are the domain of the display (U2) firmware; I don't think you mentioned it. After fixing up the battery configuration, if it still isn't working, consider updating to display firmware 02.83.

18 hours ago, Solar56 said:

I just got the information : yes it has the 3 options you mentioned

Ok, another confirmation that you have a King. Sorry, Google must have brought me to the wrong page, or the advertiser had the wrong specs and/or photo.

It helps us to help you when we know exactly what model of inverter you have.

Edited October 17, 20231 yr by Coulomb

6 hours ago, Coulomb said:

Battery BMS problems are the domain of the display (U2) firmware; I don't think you mentioned it. After fixing up the battery configuration, if it still isn't working, consider updating to display firmware 02.83.

By "fixing up the battery configuration", you mean following the SYS's recommendation to set the 'C' version in first and second place ?

14 hours ago, Solar56 said:

By "fixing up the battery configuration", you mean following the SYC's recommendation to set the 'C' version in first and second place ?

Yes.

Plus any other recommendations from packaged battery owners; I'm not one.

Edited October 18, 20231 yr by Coulomb

Hi back !

I updated the AXPERT KING a few days ago and waited for some good weather to reach the 100% load and equilibration.

Here's results so far while WatchPower displays:

Is this behavior normal?

 

Hi guys,

I'm on the site for a few days.

As I only had an USB cord last time I came in November, I only updated the DSP.

Today, I tried the MCU update.

There is a WiFi module linked to it, so I had to disconnect it to link the USB to RS232 serial cord (https://www.vtop.shop/products/u2rj45-c)

While I did that, the screen of the MCU turned black and re-worked after a while.

But here's a screenshot of the MCU's reflashing attempt.
What do you think about that ?

And, by the way, merry Christmas!
 

 

Edited December 25, 20231 yr by Solar56

16 hours ago, Solar56 said:

While I did that, the screen of the MCU turned black and re-worked after a while.

Ouch! I think you shorted some power supplies or similar.

16 hours ago, Solar56 said:

What do you think about that ?

You should not use any USB adapter that ends in RJ-45; it will have the wrong pinout as Axperts use a non-standard pinout. You have to use one with a D9 connector, and use the white (light grey?) cable that came with the inverter. At least the D9 connection is standard.

I've never used an adapter that was USB-C at the USB end, but there should be no problem with that.

I think you were lucky not to damage the display. It's even possible that you have blown one of the 3-4 SMD fuses that are inside there.

You might be able to buy a short RJ-45 extension lead (male to female), cut it open and re-arrange the wires to adapt the wiring. The required wiring from a D9 connector is here; hopefully in the instructions is says what the RJ-45 connections are with your adapter. If not, it may be this standard: https://www.zytrax.com/tech/layer_1/cables/tech_rs232.htm#rj45 .

Quote

And, by the way, merry Christmas!

Thanks, and a happy new year to you! Sorry I can't be the bearer of better news.

Edit: Be happy that your misadventures led to an improvement to the upload instructions, which now feature this image:

Edited December 26, 20231 yr by Coulomb

@Solar56

I have checked your pictures and noticed that dip switches on the batteries may not be properly set. Check user manual because the position of dip switches is inverted from US2000 to US2000C.

According to manufacturer recomendations, the master battery should be the one with most recent firmware version

On 2023/12/28 at 5:26 PM, Mauritius B said:

@Solar56

I have checked your pictures and noticed that dip switches on the batteries may not be properly set. Check user manual because the position of dip switches is inverted from US2000 to US2000C.

According to manufacturer recomendations, the master battery should be the one with most recent firmware version

Thank you !

I can confirm that the hardware setup is ok.

The MCU is also updated with the latest firmware for one month now...

Still the display says 65% while we have 6 green LEDs on the batteries.

I'm on the site now.

The seller asked me to set the total power of the batteries to 250 Ah.

I don't know if the Axpert King let this choice opened to user ?

Any ideas?

5 hours ago, Solar56 said:

Still the display says 65% while we have 6 green LEDs on the batteries.

Is the battery icon flashing? If not, then it's not talking to the battery's BMS that this explains the huge discrepancy. The battery type setting should be PYL, and the cable between the master battery and the inverter should be in place. Cable in the BMS port at the inverter end.

5 hours ago, Solar56 said:

The seller asked me to set the total power of the batteries to 250 Ah.

Perhaps he meant that the total maximum charge current should be no more than 250 A; 250 Ah is an energy value, not a power value. Your 5 battery modules comes to over 6000 Ah, so 250 Ah makes no sense. But 250 A is an average of 50 A per module, and generally 25 A each is recommended. Plus, a single Axpert King can only charge at some 140 A anyway. 

10 hours ago, Solar56 said:

Thank you !

I can confirm that the hardware setup is ok.

Can you post a picture of the batteries showing current connections and configs?

On 2024/02/08 at 6:22 AM, Coulomb said:

Is the battery icon flashing? If not, then it's not talking to the battery's BMS that this explains the huge discrepancy. The battery type setting should be PYL, and the cable between the master battery and the inverter should be in place. Cable in the BMS port at the inverter end.

Perhaps he meant that the total maximum charge current should be no more than 250 A; 250 Ah is an energy value, not a power value. Your 5 battery modules comes to over 6000 Ah, so 250 Ah makes no sense. But 250 A is an average of 50 A per module, and generally 25 A each is recommended. Plus, a single Axpert King can only charge at some 140 A anyway. 

Hello,

As I was on the site in february, I tried an idea : stetting back the parameters to Pylontech again !
(Before the last firmaware update, the installation didn't worked with other setings than 'user' with the mix of batteries versions).
Miracle, since then, we could get a nearly normal displaying.

One last thing disapoint me : while charging and reaching 100%, WatchPower shows a 53V+ value (that is ok).
But as soon as there is no more sun to charge or feed / or if there is more consumption than entering power, the voltage is displayed at 50V ?!

3 volts offset between the two states ?  really ?

Do you think it's a normal behaviour or should I keep resolve something ?

Regards and thank you so much for all the help already provided !

 

13 hours ago, Solar56 said:

One last thing disapoint me : while charging and reaching 100%, WatchPower shows a 53V+ value (that is ok).
But as soon as there is no more sun to charge or feed / or if there is more consumption than entering power, the voltage is displayed at 50V ?!

3 volts offset between the two states ?  really ?

This is normal. When charging, the cells are at over 3.5V per cell, and when resting or lightly discharging, they are at 3.33V per cell. These correspond to 53V and 50V respectively for a 15S LFP battery like the Pylontechs. 

Ok so we can consider it's all good now.

I wouldn't have succeeded without your help !

❤️