14 hours ago, bratpit said:

Blue circle indicates zone when inverter switches to float state.

But the battery voltage continues to rise above 54.0 V, and arrives at about 54.9 V, which I assume is your bulk/absorb voltage.

Are you saying that the charge LED stopped flashing at about 10:10-10:35 that day?

As far as I can tell, your inverter is operating as expected, with the possible exception of the charge LED. I would have to see beyond 13:00 to see if it actually switched to the float setting (I assume that's 54.0 V) after a suitable time in the absorb charge stage.

Edit: Maybe what's happening at about 10:30 is that the spike in battery voltage (it could be more than shown on the graph because the graph only gets battery voltage samples every so often) could have flipped the inverter from bulk stage to "bulk/absorb" stage internally. I'd have to check what the charge LED is supposed to do in this stage, but maybe that's why the LED stopped blinking (if I even got that right). Bulk/absorb stage is not significantly different from bulk stage; it's still targeting the CV/bulk/absorb voltage setting.

Edited January 20, 20251 yr by Coulomb

4 hours ago, Coulomb said:

But the battery voltage continues to rise above 54.0 V, and arrives at about 54.9 V, which I assume is your bulk/absorb voltage.

My settings:

26- 55.5V

27- 54.9V

Yes. Charging (current not stop and do not change too)do not stop until reach settings 27 (float voltage) but never goes to 26(bulk) if it is above 27. 

Practicaly inverter bulk settings is ignored and always equals  float .Side effect: premature bug  as if it didn't exist.

I think for LFP is not a big issue.

 

4 hours ago, Coulomb said:

Are you saying that the charge LED stopped flashing at about 10:10-10:35 that day?

Yes. Something triggers that diode stop blinking so early.

5 hours ago, bratpit said:

Something triggers that diode stop blinking so early.

I somehow got the idea that you have a VM IV with the round display, and could not find the LED control logic. Then I realised that these models don't HAVE a charge LED.

So you have a VM III with the removable display?

Does it have 6 push buttons or 4 touch buttons?

1 hour ago, Coulomb said:

I somehow got the idea that you have a VM IV with the round display, and could not find the LED control logic. Then I realised that these models don't HAVE a charge LED.

So you have a VM III with the removable display?

Does it have 6 push buttons or 4 touch buttons?

I bought it in SP24 Italy in 2022. They claimed it is an Axpert.Maybe early models  they were unfinished or it is some kind of clone but apart from that issue it works OK.

Edited January 20, 20251 yr by bratpit

15 hours ago, bratpit said:

They claimed it is an Axpert.

It looks genuine to me; I've seen that brand before.

22 hours ago, bratpit said:

Yes. Something triggers that diode stop blinking so early.

I've finally tracked down what causes that CHG LED to misbehave. If you have display firmware version 25.xx, it is expecting the flag that says that float stage is reached in a three-digit field right at the end of the QPIGS command. All three 60.xx firmwares that I've looked at simply don't send this field. It's a wonder that the LED works at all.

So for now, we know that we can't rely on that LED to tell us whether the inverter is in the float stage; this is most unfortunate.

I see your battery voltage flattening out at 54.9 V, which I assumed was your bulk voltage setting, but in fact it's your float voltage setting. Exactly as if the premature float bug was in effect. So I'll have to go back and check my work.

Thanks for being patient and answering all my questions.

On 2024/05/29 at 5:18 PM, Tarek Yag said:

So, you have understanding of firmware upgrades for the non-twin inverters? I'm looking for the firmware upgrades for the VMIII 5K-48. Do you know where I can find these? They are not on the Voltronic page.

 

On 2024/07/27 at 8:26 AM, Coulomb said:

I don't have version 56.72, but the main Solar Charge code in 84.00 is the same as that in 56.11 and 56.97.

But there could well be other differences; 56.xx is nominally a VM III firmware according to the reflash file names, while 84.00 doesn't seem to say.

Dear friends, I am sharing with you the firmware update for the Axpert VM TWIN, version 60.95.

Does this update work on the Axpert VM III TWIN and Axpert VM IV TWIN TWIN?

Is it only for 4 kW?

Or does it also work on 4.2 kW, 6 kW, and 6.2 kW power levels?

Please share for the benefit of all.

VM TWIN_Ver60.95.7z

6 hours ago, kafaa group said:

Does this update work on the Axpert VM III TWIN and Axpert VM IV TWIN?

I believe that it does, yes.

6 hours ago, kafaa group said:

Is it only for 4 kW?

No, it works for three power levels: 6.0kW, 4.0kW, and 1.5kW.

6 hours ago, kafaa group said:

Or does it also work on 4.2 kW, 6 kW, and 6.2 kW power levels?

Not for 4.2 or 6.2 kW.

This firmware is from January 2024 (per the date stamp on the hex file). Versions 60.87 (Feb 2024) and 60.10 (June 2024) are later.

19 hours ago, Coulomb said:

I believe that it does, yes.

No, it works for three power levels: 6.0kW, 4.0kW, and 1.5kW.

Not for 4.2 or 6.2 kW.

This firmware is from January 2024 (per the date stamp on the hex file). Versions 60.87 (Feb 2024) and 60.10 (June 2024) are later.

Thanks for the note.

On 10‏/12‏/2024 at 14:24, Coulomb said:

بالنسبة لأولئك الذين ينتظرون تحديث إصدار البرامج الثابتة VM III رقم 60.10، فهو هنا.

هذه هي التحديثات البرمجية المُرقعة x60.10، المستندة إلى التحديث الأصلي 60.10 لأنظمة Axpert VM III Twin بقدرات 6 كيلوواط، 4 كيلوواط، و1.5 كيلوواط، وAxpert VM IV Twin بقدرات 6 كيلوواط، 4 كيلوواط، و1.5 كيلوواط. تُطبّق هذه التحديثات معظم تحديثات Georg لأنظمة MPPT "التوقف عند 90 فولت" (هنا يكون التوقف عند 60 فولت)، وتُصلح خطأ التعويم المبكر. التحديثات الوحيدة غير المُطبّقة هي لثابت التيار الأمامي، والذي يبدو أنه لا يتغير بناءً على جهد الطاقة الشمسية في أيٍّ من تحديثات أنظمة VM. يجب أن يظهر رقم الإصدار كاملاً عند استخدام برنامج المراقبة، ولكنه سيظل يظهر 60.06 على شاشة اللوحة الأمامية. لا يُستخدم مع أي طرازات أخرى، ولا حتى طرازات VM III وVM IV القديمة بقدرات 5 كيلوواط أو 3 كيلوواط، أو الطرازات غير التوأمية. الاستخدام على مسؤوليتك الخاصة.

في أداة إعادة التحميل، قد تحتاج إلى الانتقال إلى المجلد الذي يحتوي على الملفات المُرقعة عند تشغيلها لأول مرة. اختر ملف hex بأقل جهد MPPT تريده: 90، 100، 150، أو 200 فولت، أو اختر الملف الذي لا يحتوي على أي ترقيات MPPT (انظر أدناه). استخدم جهد MPPT أدنى نادرًا ما تنخفض عنه ألواحك إلا في الظلام الشديد الذي لا يوفر طاقة شمسية كافية. يعتمد هذا على عدد الألواح ونوعها، وقد يكون مفيدًا للتجربة.

يحتوي 960.10 على جهد MPPT أدنى يبلغ 90 فولت. استخدم هذا إذا كان لديك الحد الأدنى لعدد الألواح (على سبيل المثال 4 ألواح مكونة من 72 خلية).

1 60.10 لديه الحد الأدنى من جهد MPPT 1 00 فولت.

5 60.10 لديه الحد الأدنى من جهد MPPT 1 5 0 فولت.

2 60.10 لديه الحد الأدنى من جهد MPPT 2 00 فولت.

لا يحتوي الإصدار 860.10 على تصحيحات MPPT على الإطلاق، فقط تصحيح التعويم المبكر.

dsp_original.hex هو إصدار البرنامج الثابت الأصلي غير المصحح (المصنع) 60.10، في حالة رغبتك في الرجوع إلى الإصدار الأصلي.

 

تعليمات تحميل البرامج الثابتة  للطرازات ذات الشاشة القابلة للإزالة أو المستديرة.

<font style="vertical-align: inherit;"><font style="vertical-align: inherit;">dsp x60.10_patched.zip</font></font>

تعديل يناير ٢٠٢٥: في بعض برامج VM المُرقعة، استخدمتُ كودًا بسيطًا، للأسف، لم يصل إلى مرحلة التعويم. هذا البرنامج المُرقّع لا يعاني من هذه المشكلة، وعلى حد علمي لم يصل إليها أبدًا. كانت إصدارات x60.06 المُرقعة السابقة تعاني من خطأ التعويم المبكر.

Is this version 60.10 compatible with this device? Are there any problems with it? Note: I have seen here versions numbered 70.00 and 71.03. What is your advice? Thank you.

7 hours ago, ala syria said:

Is this version 60.10 compatible with this device?

I believe so.

7 hours ago, ala syria said:

Are there any problems with it?

Actual users would have to answer this. I just patch the firmware, I can't actually run any of these.

7 hours ago, ala syria said:

Note: I have seen here versions numbered 70.00 and 71.03.

As I've said elsewhere, the VM III and VM IV firmware numbering is very chaotic. That's most of the reason for this topic, and it only focuses on the Twin models. 60.10 from June 2024 is the latest of the 60.xx, 70.00, and 71.03 firmwares.

Hello,

i have Axpert VM III TWIN 4KW and felicity lithium 7.5 KW 24V

when put the setting in inverter to LIB to link BMS battery to inverter i got Fault 04 and inverter shutdown

so there any update can fix this bugs ? and decrease then fan noise also

Thank You

4 hours ago, Abdelrazak said:

when put the setting in inverter to LIB to link BMS battery to inverter i got Fault 04 and inverter shutdown

Fault code 04 is battery voltage too low. Is this happening only after charging the battery?

60.10 is the latest 60.xx firmware that I'm aware of.

60.95 available from the link below is about 5 months older, but is supposed to quieten down the fans (too quiet for operation in Syria, according to one poster). Perhaps worth a try.

If that doesn't fix the fault code 04, then you could always run that battery with battery type USE, and not attempt to connect to the battery's BMS.

The only 57.xx display firmware I have is 57.16.

43 minutes ago, Coulomb said:

Fault code 04 is battery voltage too low. Is this happening only after charging the battery?

60.10 is the latest 60.xx firmware that I'm aware of.

60.95 available from the link below is about 5 months older, but is supposed to quieten down the fans (too quiet for operation in Syria, according to one poster). Perhaps worth a try.

If that doesn't fix the fault code 04, then you could always run that battery with battery type USE, and not attempt to connect to the battery's BMS.

The only 57.xx display firmware I have is 57.16.

First i receive warning 61 while charging battery in 92%

the company agent replace the inverter with new one and still same issue

after company changed BMS battery after changing BMS i got this Fault anytime when put battery type to LIB

On 2024/09/21 at 1:08 PM, esmail-kassir said:

Feel free to message me or whatsapp if you need any help.

what is you whatsapp number to contact you i have problem with my inverter

On 2025/04/28 at 10:20 PM, Abdelrazak said:

First I receive warning 61 while charging battery at 92% [ SOC ]

Warning code 61 is "communications lost" (to the battery's BMS). Why that would happen only at a highish State of Charge I don't know.

On 2025/04/28 at 10:20 PM, Abdelrazak said:

after company changed BMS battery after changing BMS i got this Fault anytime when put battery type to LIB

That sounds like something weird is going on with the BMS to me. Is it possible to update the firmware in the BMS itself?

It could be worth asking you inverter supplier for the latest (if any) firmware for the display, which also handles BMS communications. Per a manual I happened to have open, in the section describing warning code 61: "After 10 minutes, inverter will stop charging and discharging to lithium battery." In other words, after 10 minutes of warning code 61, the battery will disconnect, so that explains the fault code 04. Though I though that these models could operate batteryless, in which case I'd expect it to continue powering loads via AC-in or PV if there is sufficient PV power available, and instead merely flash the BP (Battery not Present) warning.

Some users have 4.2 kW units. The unit type is winged.

The following versions are available:

U1: 68.06

U2: 28.01

What is the appropriate update for these devices?

16 hours ago, Coulomb said:

That sounds like something weird is going on with the BMS to me. Is it possible to update the firmware in the BMS itself?

Thank you for your reply

My inverter firmware version

U1:00060.10

U2:00057.16

warning 61 i received only when charging battery and in 95% and 98% and Before changing battery BMS supplier update the BMS and still issue not solved he replace the inverter with a new one still the same issue then he updated the inverter to latest version and changed the BMS the issue now It got worse, direct when i put battery type to LIB i received Fault 04 in charging and discharging

now i fond in this thread how to fix this issue by putting battery type to pylon and i changed the DIP switch on the battery to just leave 1 on and it's working fine to me

but still i face issue in battery after supplier changed the BMS with SOC % it's not accurate with voltage and decrease very fast to 1% while the voltage still 26.4 and this make a problem with inverter it's shutdown and cut electricity because the battery cut-off capacity set to 20

Edited April 30, 20251 yr by Abdelrazak

11 hours ago, ahmad almawal said:

The following versions are available:

U1: 68.06

U2: 28.01

That's outside my area of knowledge. I only have 68.04, presumably older than 68.06, and 68.04 is indeed for a 4.2 kW model (as well as 1.5kw and 6.0 kW 48V). My guess is that this is a hacked firmware, and the hardware may not safely handle 4.2 kW continuously. So sorry, I have no upgrade path for this.

The 28.01 display firmware is even more mysterious. My notes say that the only 28.xx display firmwares I have seen are for ESS (batteries)!

So sorry, I've struck out on both counts. You'll have to ask your supplier for updates.

1 hour ago, Abdelrazak said:

now i fond in this thread how to fix this issue by putting battery type to pylon

My only suggestion is to change the battery type to USE, set appropriate limits for float, bulk/absorb, and cut-off voltages, and ignore the SoC% reading on the inverter (it guesses based on voltage, as if the battery being lead acid). Hopefully the battery itself gives some indication of its true state of charge.

3 hours ago, Coulomb said:

My only suggestion is to change the battery type to USE, set appropriate limits for float, bulk/absorb, and cut-off voltages, and ignore the SoC% reading on the inverter (it guesses based on voltage, as if the battery being lead acid). Hopefully the battery itself gives some indication of its true state of charge.

i contact the supplier and he asking now felicity company what the issue to solve it thank you

Hi everyone,
I’m currently using a Maxpower PV5000Pro inverter system and facing a couple of confusing and frustrating issues that I’m hoping someone here might be able to help me with. The system was installed by a technician, and the software version currently running on the inverter is:
5kPro latest VM TWIN_60.76
Below are the two main issues I’m struggling with:

🔧 Issue 1: Inverter Not Sharing Load Between Solar and Grid (in SUB Mode)
•
I have set the Output Source Priority to SUB mode, which means:
Solar → Utility → Battery
This setting should prioritize solar power first. If solar is not enough, then it should use the grid (utility), and finally the battery.
•
However, the actual behavior is very different:
•
Even when solar is producing full power (e.g., during peak sunlight), as soon as I enable the grid connection, the inverter completely stops using solar.
•
It transfers all the load directly to the grid — no matter if it's peak solar hours or if I have sufficient solar power.
•
This completely defeats the purpose of using solar energy efficiently. It also increases my electricity bill unnecessarily.
•
I have tested this multiple times under different conditions, but the problem remains.

⚠️ Issue 2: APL Mode Does Not Work as Expected
•
The inverter allows switching between two AC input modes:
1.
UPS Mode – Usually meant for sensitive electronic devices, with a narrow voltage input range.
2.
APL Mode – Should allow a wider input voltage range, and should be more tolerant of low/high voltages.
•
The problem is:
•
Whether I set it to UPS or APL, the inverter switches to battery mode as soon as the grid voltage drops below 170V.
•
In my understanding, APL mode is supposed to continue using grid power even at lower voltages (maybe down to 90V or 100V), but that is not happening.
•
So, in areas with weak or fluctuating voltage (like mine), the inverter keeps switching unnecessarily to battery mode, which is not ideal.

❓ My Questions:
1.
Is this kind of behavior normal for the Maxpower PV5000Pro?
2.
Is this possibly a firmware/software issue with version VM TWIN_60.76?
3.
Has anyone faced a similar issue with SUB mode not prioritizing solar?
4.
How can I make the inverter properly share load between solar and grid instead of shifting everything to the grid?
5.
Why is APL mode not behaving differently from UPS mode? Is there a fix or setting I’m missing?
6.
Would downgrading/upgrading the firmware help?

Any help, suggestions, or shared experiences would be extremely appreciated. I’m trying to make the most of my solar setup, and these issues are really limiting its efficiency.
Thanks in advance to everyone!

On 2025/05/27 at 3:37 PM, Hamid__ said:

My Questions:

Sorry, I can't answer most of your questions, not being a user of this model, or of the Axpert VM IV that it may be a variant of, or a copy of. I see no sticker on the right hand side of photos, so my guess is that it's a clone using Voltronic firmware (whether licensed or stolen).

I can tell you that Voltronic firmware version 60.76 is two years old; the latest available 60.xx firmware (60.10) is 11 months old as I type. It could be worth updating the firmware.

Voltronic firmware version 60.10 is available here:

It looks like 60.76 which you have now is available here, in hex file only, in case you need to go back for whatever reason (and assuming that your inverter uses unmodified Voltronic firmware):

It's possibly worth reading the above post, as the author states that they are happy with that version.

Edited May 31, 20251 yr by Coulomb
Added links to firmware

On 2025/05/27 at 8:37 AM, Hamid__ said:

❓ My Questions:
1.
Is this kind of behavior normal for the Maxpower PV5000Pro?
2.
Is this possibly a firmware/software issue with version VM TWIN_60.76?
3.
Has anyone faced a similar issue with SUB mode not prioritizing solar?
4.
How can I make the inverter properly share load between solar and grid instead of shifting everything to the grid?
5.
Why is APL mode not behaving differently from UPS mode? Is there a fix or setting I’m missing?
6.
Would downgrading/upgrading the firmware help?

My MPPSolar does the same thing
It does it on every firmware I've tried
Both with SUB mode and with APL range (my problem is the higher threshold tho, my grid is basically unusable now with 260-270V all the time)

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