44 minutes ago, DM_UA said:

Здравствуйте, Coulomb!
У меня есть электростанция Ultra 11 кВт марки Sunmart с прошивкой версии 25.07. В режиме SBU при зарядке аккумуляторов или при перенаправлении питания от нагрузки к аккумулятору при уменьшении нагрузки возникают ошибки F17 (высокое смещение постоянного тока) и F11 (высокий инвертированный ток). Однако в режиме SUB она работает нормально. Функция Wi-Fi не работает "из коробки", что было исправлено обновлением прошивки от продавца (Sunmart). Работает с приложением "Solar of things" (только мониторинг, никаких настроек нет), теперь отображается в приложении Isolar. Отображается в Watchpower с ПК через порт RS232.
При зарядке аккумуляторов в режиме SUB отображается ошибка W11 (потеря связи), серый маленький экран и выключенные полосы на верхнем круглом экране. Может быть, у меня сбой в прошивке? Что вы думаете? Представитель продавца замолчал после всего этого сообщения. Сегодня связался с другим представителем продавца и снова отправил все данные.
HW 01.00
DSP: 25.07
MCU1: 08.08
MCU2: 60.03
LCD: 01.00

Hi. I had the same problem with these firmware versions. And the representatives couldn't provide me with anything. Try updating to the new version. The latest one. It worked for me. It works without any issues.

Hi. I had the same problem with these firmware versions. And the representatives couldn't provide me with anything. Try updating to the new version. The latest one. It worked for me. It works without any issues.

OK. Found all instructions in the files here. latest version it's 25.11 or 25.74 ? I found both here on forum.

By the way, the name of the update file, that seller sent me to use for the wifi fix - W71(2M)K11-v1.44.5_SolarV11_upgrade_Cc

Edited May 26May 26 by DM_UA

2 minutes ago, YRIIY said:

Here's the latest one. It works well for me. Give it a try.

27 minutes ago, DM_UA said:

Хорошо. Все инструкции найдены в файлах здесь. Последняя версия — 25.11 или 25.74? Обе я нашел здесь, на форуме.

Кстати, название файла обновления, который продавец мне прислал для исправления проблемы с Wi-Fi: W71(2M)K11-v1.44.5_SolarV11_upgrade_Cc

Can you share those files?

29 minutes ago, DM_UA said:

Хорошо. Все инструкции найдены в файлах здесь. Последняя версия — 25.11 или 25.74? Обе я нашел здесь, на форуме.

Кстати, название файла обновления, который продавец мне прислал для исправления проблемы с Wi-Fi: W71(2M)K11-v1.44.5_SolarV11_upgrade_

By the way, this version also works well. I installed it. Now I have installed this latest version.

9 minutes ago, YRIIY said:

Can you share those files?

Instruction from the seller to use it: Find the local ip address for your device.
Create the link that will look: http://your local ip address here/hide.html Connect to the same wifi with your inverter. open link in the browser. You'll get upload page. select file and upload. reboot the inverter.

W71(2M)K11-v1.44.5_SolarV11_upgrade_Cc.bin

8 minutes ago, YRIIY said:

By the way, this version also works well. I installed it. Now I have installed this latest version.

So the solution is to update both FW - DSP and MCU?
to 25.11 and 12.18 ?

Yes, try it. I had the same firmware as you. I had to dance with a tambourine near the inverter. I re-flashed it and forgot about it. One DSP 25.09 didn't work. It also started throwing errors with my settings. I reverted it back and forgot about it. I just wanted to research the firmware and choose a good one. Now I'm on 25.11 and everything is fine.

2 minutes ago, YRIIY said:

Yes, try it. I had the same firmware as you. I had to dance with a tambourine near the inverter. I re-flashed it and forgot about it. One DSP 25.09 didn't work. It also started throwing errors with my settings. I reverted it back and forgot about it. I just wanted to research the firmware and choose a good one. Now I'm on 25.11 and everything is fine.

Thanks!

11 minutes ago, DM_UA said:

Значит, решение состоит в обновлении прошивки — DSP и MCU —
до версий 25.11 и 12.18?

13 minutes ago, DM_UA said:

Инструкция от продавца по использованию: Найдите локальный IP-адрес вашего устройства.
Создайте ссылку, которая будет искать: http://ваш локальный IP-адрес здесь/hide.html. Подключитесь к той же сети Wi-Fi, что и ваш инвертор. Откройте ссылку в браузере. Вы попадете на страницу загрузки. Выберите файл и загрузите его. Перезагрузите инвертор.

<font dir="auto" style="vertical-align: inherit;"><font dir="auto" style="vertical-align: inherit;">W71(2M)K11-v1.44.5_SolarV11_upgrade_Cc.bin</font></font>

13 minutes ago, DM_UA said:

Инструкция от продавца по использованию: Найдите локальный IP-адрес вашего устройства.
Создайте ссылку, которая будет искать: http://ваш локальный IP-адрес здесь/hide.html. Подключитесь к той же сети Wi-Fi, что и ваш инвертор. Откройте ссылку в браузере. Вы попадете на страницу загрузки. Выберите файл и загрузите его. Перезагрузите инвертор.

<font dir="auto" style="vertical-align: inherit;"><font dir="auto" style="vertical-align: inherit;">W71(2M)K11-v1.44.5_SolarV11_upgrade_Cc.bin</font></font>

As far as I remember, when I go to its local lp address, it asks for a password. And I couldn't find it anywhere.

28 minutes ago, YRIIY said:

As far as I remember, when I go to its local lp address, it asks for a password. And I couldn't find it anywhere.

user and pass the most secret in the world: admin/admin. Ah, before the update you need to remove the device from the monitoring software account. After the update - you need to add it again with BLE

Edited May 26May 26 by DM_UA

I also tried the same secret password: admin.admin. It's loading forever.

1 hour ago, DM_UA said:

Инструкция от продавца по использованию: Найдите локальный IP-адрес вашего устройства.
Создайте ссылку, которая будет искать: http://ваш локальный IP-адрес здесь/hide.html. Подключитесь к той же сети Wi-Fi, что и ваш инвертор. Откройте ссылку в браузере. Вы попадете на страницу загрузки. Выберите файл и загрузите его. Перезагрузите инвертор.

<font dir="auto" style="vertical-align: inherit;"><font dir="auto" style="vertical-align: inherit;">W71(2M)K11-v1.44.5_SolarV11_upgrade_Cc.bin</font></font>

Firmware Upgrade Utility укр.pdf

I get it. I updated Bluetooth using a different method. It didn't help. There are no settings in the app. And the battery level doesn't show, but the charge level is still showing.

Firmware Upgrade Utility укр.pdf

Yes, the settings are missing. It's how it is. The wifi connection is for monitoring only. I have Solar Assistant and it's the only way to have the remote control with these models. Don't know why they limited that in Solar of Things app.

Yes, I also monitor Solarassistent. But now it can connect to the inverter via Wi-Fi. But it doesn't connect to this one. But it does connect to the Voltronic MAX II 11000W. And I want to install a Solar Vampir, too, and I need another RS-232 port. Now I'm wondering how to solve this.

I wanted to throw away the Wi-Fi and just connect the Solar Vampir instead. But it has a different protocol than the MAX II. I'm currently talking to the Vampir admin. I want to get this whole thing working.

F17 for ultra model the update firmware

Suntex service

Axpert_ultra_11K_ver 25.68.7z

On 2026/05/27 at 11:47 PM, Bassemubid said:

F17 for ultra model the update firmware

Suntex service

Axpert_ultra_11K_ver 25.68.7z

Is this firmware made for Axpert Ultra 11Kw to fix F17 Fault?

Edited yesterday at 03:061 day by DM_UA

6 hours ago, DM_UA said:

Предназначена ли эта прошивка для Axpert Ultra 11Kw для устранения ошибки F17?

Hello everyone. You just need to try. It won't flash with incompatible firmware.

25.68 helped a bit. At first everything was fine, but then - again

After flashing 25.68, initially everything was fine:

- SBU mode, charging batteries from solar at 30A with no AC load — no problem

- Connected AC output, 2.5 kW load, then disconnected — no problem

- Pulsing load 1.4 kW (coffee machine, brewing a few espressos) — no problem

However, as soon as battery charging occurred simultaneously with AC consumption — problems started and the same F17 High DC Offset fault appeared.

More specifically: AC load was no more than 1.5 kW. Batteries had reached 100% SOC. PV output was insufficient to cover the load, so the inverter was drawing from the batteries. The fault occurred at the exact moment when the inverter switched from discharging the batteries to charging them from solar.

Setup:

- Inverter: Sunmart Ultra 11kW (Axpert Ultra)

- Battery: 3 × 48V 100Ah LiFePO4 in parallel, 15S, user-defined battery type

- Bulk: 51.7V, Float: 51.0V, Back to battery: 51.0V

- DSP firmware: 25.68

- Mode: SBU

- F17 High DC Offset fault happens specifically at the transition moment from battery discharge to solar charge, at 100% SOC, under AC load. Charging from AC has no problem. Maybe there might be some physical fault on the PV input side (condensers, drossels, etc)?

I am attaching a chart from today (2026-06-07). The inverter was in SUB mode until 13:00. At 13:00 I flashed DSP 25.68 and switched to SBU mode. The fault occurred around 14:00 — visible as a sharp spike on all three parameters (PV2 Power, AC Output, Feed Network Power) followed by data cutoff when the inverter shut down due to F17.

What I don't understand also why I have data on Feed Network Power chart, if feed to grid has been disabled?

Edited 3 hours ago3 hr by DM_UA

And did you try to check the voltage indicators of the inerto and the battery. Measure with a tester. What is the difference between them? Maybe you need to calibrate the inverter. Adjust it to the battery indicator.