PetrDubi

Hi everone,
yesterday I was upgrade FW in my Easun SMW 8k with patched FW 90.09 175V version and all is ok. With original FW was on PV input voltage 90V with current to 0,5A from panels and over 0,5A voltage going up. Now going voltage up from current 0,1A. Yesterday was the same weather as today (inversion). Yesterday was power from PV 30-40W with current 0,2-0,3A and today was power over 100W (yesterday was 100W peak 2x for all day) with current 0,2-0,3A.
Original FW was 46.05 and display 112.11. First I upgrade display to 112.19 (from download section in this forum) and then I upgrade 8kW.zip 175V version (thank you Georg).

I was firmware 46.0x in my Easun SMW 8 kW which I bought in february 2022. I flashed in autumn from initial firmware to firmware from this thread based on 90.06 (150V version). Now i use shadow management beta firmware from Georg594.

I using ESP32 with program in ESPhome for monitoring JBD BMS in Home Assistant and for a week ago I made connection to MAX 8k over CAN bus with protocol Soltaro (thank Coulomb and other users for information about this protocol). Function of connection is good, atfer some seconds flashing battery icon on inverter LCD and in information menu is new information about numbers of battery pack. One problem is with setting voltages because max charging voltage is setting for absorption voltage and for float voltage (boath is the same) in inverter. I was must made a small controling in ESP32 which change voltage from 55V after charge battery to 53,6V (and back tu 55V when battery is discharged) but this was not problem and all function verry well.

hello people 
first i would like to give  special thanks  to mr  colombos and  all  people in this  great  forum for thier support  and  togetherness 
 
today i carry to you all  guy success story  so please listen 
 
qmax 24vdc 3000 watt come in for repair   the  problem was 09 error
i opened the inverter  and  find the  previous  techncian  have  replaced all   h-bridge  and  rectifer igbts by  bad  quality igbts
the primary fets  and thier  drive  circuits cheked ok 
and i also find  few burned  zeners and  reisstors  in recctifier  igbts  gate  cicruits 
 
i assume  that  the  inverter   first come in  with onlyhbridge   igbts problem 
after technician  replace  all  igbts  with bad qualty one ,
he   introduced  another  failure   ,   since all  rectfier igbts  went bad
 
 
i started  by cleaning and replacing eevery  bad  zener  diode  reisstor  in rectifier  igbt   gate  circuits   ,
 
after i  finished i checked the  h bridge igbts  they seems all fine
 
i installed  new igbts  for  the  rectifier  igbts  and  fired the  units on 
 
error  09  appaer again and  one  igbt in the  h-bridge   shorted 
 
 
i felts that i  was  too  hasty  ,  i should  have checked the  busvoltage    dc   and  the pulse  drive  for the  hbridge igbts    before i turn  the device on 
 
 
so i desoldered  the  h-bridge  igbts  trun on device  and tested  the bus,   it was normal  at 370vdc  also  the   drive  gate   was ok   square  wave  , it stays for  about  3  seconds then the  device shutdown and report 53  error    
but i noticed that one drive is missing    i  shitdown   device and trace  back to find  47 ohm resistor  opened
 
i  solder new 47 ohm  in   fired the unit   again checked the  wave forms   they   all  check ok  ,   i have  feeling that with new  igbts  it should  work  fine 
 
 
 
true  enough  i installed  k50h60   and turn the  device on  it all worked  fine    i even lload  the   qmax   3k  inverter  with 60w  lamps   it  glowed   nicely 
 
i  cant  believe i did it    the gates  of the rectifer  igbts   have lots of  bad  reistors  and  zener     i did it i did it i am  happy   !
about 16  picture is loaded  for the repair  story you can easily  download the picture  to see    how  i did it 
each picture  has  number  follow the numbers from 1  to 16  to see how  i progressivly   repair the inverter 
.https://www.mediafire.com/file/axldufan39ufoqg/repair+story.rar/file
 

Hi Georg,
I install this FW two weeks ago (previously I was use your beta FW with MPPT patch to 175V).
This FW function quite good in cloudy weather and in sunny with shadow from tree on one string (afternoon) is power better then previous FW.
Bye Petr

Hi everone,
yesterday I was upgrade FW in my Easun SMW 8k with patched FW 90.09 175V version and all is ok. With original FW was on PV input voltage 90V with current to 0,5A from panels and over 0,5A voltage going up. Now going voltage up from current 0,1A. Yesterday was the same weather as today (inversion). Yesterday was power from PV 30-40W with current 0,2-0,3A and today was power over 100W (yesterday was 100W peak 2x for all day) with current 0,2-0,3A.
Original FW was 46.05 and display 112.11. First I upgrade display to 112.19 (from download section in this forum) and then I upgrade 8kW.zip 175V version (thank you Georg).