Br999

no I have not tried to return the fans, I have already added 3 fans 120 mm above the inverter which pushes the air in with a substantial air filter because the original filters were getting clogged quickly. With this at 10 kW solar, I manage to stay below 55 degrees after several hours, but I would have liked to further improve the air flow.
for the moment the device is under warranty I don't want to take it apart too much. on this model you can remove the top cover without touching the warranty label
I also redid the connection cover at the bottom of the inverter so that the air comes out better.
so to keep it reliable and simple, you should not try too hard to put a more powerful fan

Hello, I have had an AXPERT MAX II TWIN 11Kw inverter for a few months, and I am faced with the problem of the 90V of the MPPT controller during low sunlight, which can considerably reduce solar production.
I found a solution (apparently effective) simple and without modifying the inverter, to avoid this "sticking" at 90V. Maybe someone has already proposed this solution I did not look too much on the forum.
I noticed that when the photovoltaic panels are disconnected from the inverter and then reconnect the inverter, this releases 90 V and the mppt resumes normal operation.
My solution is to add a contactor in my case an ABB AF16ZB-40-00-22, an esp8266 D1 mini, an ACS758LCB-050B-PFF-T Current Sensor Module, a 2Mohms divider bridge and an ads1015.
The contactor is used to isolate the solar panels at night to avoid any overvoltage due to a night storm (my panels are 40 meters from the inverter = large antenna for EM lightning waves).
I also added a rule:
if Amperes > 0.7A and Volt between 80 and 100V for more than 2 minutes = disconnection of the solar panels then 15 seconds later reconnection.
The inverter goes back to 275v, in my case (2x8 panels in series/parallel for the moment) then the mppt controller resumes its normal work. (see picture)
Because in cloudy weather below 1.5/2A this remained at 90v as long as the sun did not hit the panels directly or the intensity did not rise higher.
 
With this modification it allows me to produce more than 2.5x more during low light(on my installation).

Hello, I have had an AXPERT MAX II TWIN 11Kw inverter for a few months, and I am faced with the problem of the 90V of the MPPT controller during low sunlight, which can considerably reduce solar production.
I found a solution (apparently effective) simple and without modifying the inverter, to avoid this "sticking" at 90V. Maybe someone has already proposed this solution I did not look too much on the forum.
I noticed that when the photovoltaic panels are disconnected from the inverter and then reconnect the inverter, this releases 90 V and the mppt resumes normal operation.
My solution is to add a contactor in my case an ABB AF16ZB-40-00-22, an esp8266 D1 mini, an ACS758LCB-050B-PFF-T Current Sensor Module, a 2Mohms divider bridge and an ads1015.
The contactor is used to isolate the solar panels at night to avoid any overvoltage due to a night storm (my panels are 40 meters from the inverter = large antenna for EM lightning waves).
I also added a rule:
if Amperes > 0.7A and Volt between 80 and 100V for more than 2 minutes = disconnection of the solar panels then 15 seconds later reconnection.
The inverter goes back to 275v, in my case (2x8 panels in series/parallel for the moment) then the mppt controller resumes its normal work. (see picture)
Because in cloudy weather below 1.5/2A this remained at 90v as long as the sun did not hit the panels directly or the intensity did not rise higher.
 
With this modification it allows me to produce more than 2.5x more during low light(on my installation).

Hello, I have had an AXPERT MAX II TWIN 11Kw inverter for a few months, and I am faced with the problem of the 90V of the MPPT controller during low sunlight, which can considerably reduce solar production.
I found a solution (apparently effective) simple and without modifying the inverter, to avoid this "sticking" at 90V. Maybe someone has already proposed this solution I did not look too much on the forum.
I noticed that when the photovoltaic panels are disconnected from the inverter and then reconnect the inverter, this releases 90 V and the mppt resumes normal operation.
My solution is to add a contactor in my case an ABB AF16ZB-40-00-22, an esp8266 D1 mini, an ACS758LCB-050B-PFF-T Current Sensor Module, a 2Mohms divider bridge and an ads1015.
The contactor is used to isolate the solar panels at night to avoid any overvoltage due to a night storm (my panels are 40 meters from the inverter = large antenna for EM lightning waves).
I also added a rule:
if Amperes > 0.7A and Volt between 80 and 100V for more than 2 minutes = disconnection of the solar panels then 15 seconds later reconnection.
The inverter goes back to 275v, in my case (2x8 panels in series/parallel for the moment) then the mppt controller resumes its normal work. (see picture)
Because in cloudy weather below 1.5/2A this remained at 90v as long as the sun did not hit the panels directly or the intensity did not rise higher.
 
With this modification it allows me to produce more than 2.5x more during low light(on my installation).

Hello, I have had an AXPERT MAX II TWIN 11Kw inverter for a few months, and I am faced with the problem of the 90V of the MPPT controller during low sunlight, which can considerably reduce solar production.
I found a solution (apparently effective) simple and without modifying the inverter, to avoid this "sticking" at 90V. Maybe someone has already proposed this solution I did not look too much on the forum.
I noticed that when the photovoltaic panels are disconnected from the inverter and then reconnect the inverter, this releases 90 V and the mppt resumes normal operation.
My solution is to add a contactor in my case an ABB AF16ZB-40-00-22, an esp8266 D1 mini, an ACS758LCB-050B-PFF-T Current Sensor Module, a 2Mohms divider bridge and an ads1015.
The contactor is used to isolate the solar panels at night to avoid any overvoltage due to a night storm (my panels are 40 meters from the inverter = large antenna for EM lightning waves).
I also added a rule:
if Amperes > 0.7A and Volt between 80 and 100V for more than 2 minutes = disconnection of the solar panels then 15 seconds later reconnection.
The inverter goes back to 275v, in my case (2x8 panels in series/parallel for the moment) then the mppt controller resumes its normal work. (see picture)
Because in cloudy weather below 1.5/2A this remained at 90v as long as the sun did not hit the panels directly or the intensity did not rise higher.
 
With this modification it allows me to produce more than 2.5x more during low light(on my installation).