Georg594

My House is also not ideal oriented....
 
This is my solution:
6x trina 400w 
 

My House is also not ideal oriented....
 
This is my solution:
6x trina 400w 
 

Today i got a new EASUN 8 KW
it comes with firmware 46.08 main and 12.21 secondary.
flash without any problems to 90.06 based firmware(90.09)
 
 

F90 is a " clone " detection but sometimes just a corrupt eeprom.
 
The firmware is based on 90.19 and shows this too.
It has F90 patch applied and mppt optimized like in my 8kw firmware ( these versions are nearly the same)

Hi
 
you are loosing power, not much, because your cloudy mppt voltage is near to 200V.
 
An example :               200V and 0,5A = 100W       
                                    190V and 0,6A = 114W      <<<< Best point
                                    180V and 0,6A = 108W
                                    170V and 0,6A  = 102W
 
The firmware is always searching for the best point, but here it wants to go a little bit under 200v but it cant .
 
made a 175V version , everything else is the same
 
 
can anybody confirm who uses any patched version the little 90 V step will become a 102v step when grid is available??
It seems the startup voltage from internal supply differs if grid is available or not .
8KW.zip

In the datasheet of the axpert 8kw there is explained that grid to battery charge is up to 120A and solar to battery up to 80A 
And there is a limit for each mppt of 4000w .

Today i got a new EASUN 8 KW
it comes with firmware 46.08 main and 12.21 secondary.
flash without any problems to 90.06 based firmware(90.09)
 
 

@Coulomb
I think the original code to reduce mppt voltage when current is below a limit is to archive if one or two modules get shade to pull down the voltage until the bypass diodes will get active and so the other modules can bring full power.....
 
But the code is so bad that there is no check if this routine makes it more worse .....
 
On professional Inverter it's shade management and really highly complex 
 
Maybe we can bring back this function but with intelligent logic 

Maybe a look in the datasheet of PV moduls will bring us more information.
Just have a look at the performance curve in correlation to sun power .....when you look there you will see voltage and MPPT point is always relative high
If you think mppt logic is surging not enough current open your PV string and Check idle voltage....dont do it under higher power levels.... dangerous DC sparks will occur.
 
Mppt calculates voltage X current= power ...and it plays with the voltage to archive maximum power .
 
Look at my Trina tsm graph
Maximum power is always at nearly the same voltage......
 

If the voltage is below 280v MPPT will stop surging current....
But if you look at his configuration of 10 Canadian moduls in series.... there will be a current below 0.1A if you are at 280v.... then it will fall down to ~90v of the hardware limit....
At this point there is everything "pressed" out of it .... solar power is so weak that it's just useless 
 
Mine jumps in the morning from 89v  to 380v when there is a current of more than 0.1A . In the evening the same but opposite.
 
 

INTRO:
Long ago i had the theory that Internal Supply of the inverter will cause currents on both mppts inputs which will interference with mppt regulation.
 
NOW IT'S PROVEN:
The simple solution is to pull of the plug on the supply pcb which is marked with "SOLAR".
The downside:   1. Loosing of Batteryless Operation .
                            2. Inverter will not start from PV inputs when its switched off by the button to charge the battery.
MPPT works now with a minimum current of 0.0002A    really   0.2mA   (first time i cant believe the measurement)
 
FIRMWARE Modification is still needed but just only a littlebit .....not so much as in the past.
 
@Coulomb
Only the subtraction value needs to be zero, no longer need to set the minimum MPPT voltage higher than 90V or reset mppt code. Maybe we can even lower this for maximum compatibility.(eg 60v like in the twin models)  
 
 
Here a picture of the disconnected plug (on the upper right)
The safest way is to completely disconnect your inverter from any powersource before pull of the plug .

 
RESULT :
 
I supply PV 2 input with a isolation tester which provide 250V
MPPT point found by the firmware at 168V and 0,000487A 
 
WOW this is 0,082 watts 😅
 
MAYBE IT CAN USE THE MOONLIGHT FOR SOLAR PRODUCTION??? I'll check
 

The " help" supply is using around 40 watts from solar when connected and pulls down the voltage so that mppt point cannot be used .
(that does not mean that the 40 watts are not consumed)
 
If you calculate the 40 watts in general and the higher voltage because of mppt point is now always found by firmware the diagram makes also sence to me.
 
@ Coulomb
Where do you see dramatic increase in power ? 
 
Did i miss something?
Biggest incress in watt is from 38watt to 137watt

F90 is a " clone " detection but sometimes just a corrupt eeprom.
 
The firmware is based on 90.19 and shows this too.
It has F90 patch applied and mppt optimized like in my 8kw firmware ( these versions are nearly the same)

Development is still going on and this is my next evolution step.
SHADOW MANAGEMENT
 
 
INTRO :
Why do we need a shadow management ???
If there is a shadow from example of a tree on 2 of 10 Solar modules all modules will just deliver so much current as the 2 without the direkt sun,
this will result in a massive loss of power .
How do we solve this ?
Fall the tree or try this firmware solution.

------------------------------------------------------------------------------------------------------------------------------------
 
What problem is solved with this Version ?
The 90V problem is solved (changes from tweaked firmware from my mppt improvement thread are into it ,nothing new )
LED BAR IS DISABLED NOW IN FIRMWARE.( no more noise,mine does something like fast switching electronics )
NEW is Shadow Management (if you had no shadows on your PV modules there is no improvement)
 
 
This is how it works:

Every solar panel has bypass diodes into it, often more than one.
This firmware version can "activate" them so that the current is not limited by the shaded PV modules
and the moduls with sun can bring full power.
The new logic in the firmware checks if the pv input current is lower than 1,5A ,
when this condition holds on for 10 Minutes ,
The voltage is reduced to 125V to activate the bypass diodes,
then the mppt algorithm searches the new mppt point without the "deactivatet" pv moduls.
 
 

 
 
Because of the firmware doesnt know if it is sunny or cloudy there will be a minimal loss of pv power in following conditions:
Cloudy, foggy, rainy, weak sun (just every situation with a current below the 1,5A)
The reduction of power is just for a few seconds of every 10 minutes when the voltage is lower than the real mppt point.
 
 

The new working conditions:
90v Fix applied
MPPT range from 115V to 450V
shade management regulates every 10 minutes if the current is below 1,5A
No more signals to led bar are send
named this version to 90.21
Tested and runs on Axpert 8KW & EASUN (must be compatible with 90.06)
THIS IS STILL FIRST BETA RELEASE
 
Reflash-8kw-shade_managment-9021.rar

Development is still going on and this is my next evolution step.
SHADOW MANAGEMENT
 
 
INTRO :
Why do we need a shadow management ???
If there is a shadow from example of a tree on 2 of 10 Solar modules all modules will just deliver so much current as the 2 without the direkt sun,
this will result in a massive loss of power .
How do we solve this ?
Fall the tree or try this firmware solution.

------------------------------------------------------------------------------------------------------------------------------------
 
What problem is solved with this Version ?
The 90V problem is solved (changes from tweaked firmware from my mppt improvement thread are into it ,nothing new )
LED BAR IS DISABLED NOW IN FIRMWARE.( no more noise,mine does something like fast switching electronics )
NEW is Shadow Management (if you had no shadows on your PV modules there is no improvement)
 
 
This is how it works:

Every solar panel has bypass diodes into it, often more than one.
This firmware version can "activate" them so that the current is not limited by the shaded PV modules
and the moduls with sun can bring full power.
The new logic in the firmware checks if the pv input current is lower than 1,5A ,
when this condition holds on for 10 Minutes ,
The voltage is reduced to 125V to activate the bypass diodes,
then the mppt algorithm searches the new mppt point without the "deactivatet" pv moduls.
 
 

 
 
Because of the firmware doesnt know if it is sunny or cloudy there will be a minimal loss of pv power in following conditions:
Cloudy, foggy, rainy, weak sun (just every situation with a current below the 1,5A)
The reduction of power is just for a few seconds of every 10 minutes when the voltage is lower than the real mppt point.
 
 

The new working conditions:
90v Fix applied
MPPT range from 115V to 450V
shade management regulates every 10 minutes if the current is below 1,5A
No more signals to led bar are send
named this version to 90.21
Tested and runs on Axpert 8KW & EASUN (must be compatible with 90.06)
THIS IS STILL FIRST BETA RELEASE
 
Reflash-8kw-shade_managment-9021.rar

I disassembled my inverter today and did some measurements.
Hope i got it right 😉.
 
 
 
for testing i disconnct all plugs from help supply pcb and everything worked fine .....this made me suspicious
then i made a few measurements:
 
if only battery is available as power source this complete pcb is useless & main supply draws 0,45A from battery.(with 230V output active but no load  it is 1,75A)
if Grid is available the help pcb will provide 60V to main supply , battery is not used in this condition for feeding the logic
if Solar is available Grid will be ignored but will also it provide 60V to main supply , battery is also not used in this condition for feeding the logic
if you just pull off the SOLAR plug on help supply pcb then power comes from grid(if available) for all the logic (49w measured)
(this could result in 50 watts being permanently drawn from the grid)
 
 
 
 
it seems if you had a big battery (i got 1250AH 😉) it could make sense to disable the help pcb ,
and in this condion the "bug" to load battery with 2 amps when solar input is weak and grid is available makes now sence to prevent battery diacharge.
(disadvantage is inverter starts only when button is pressend , if it runs already it stays on )
 

 
 
 
 
 
 
 
MPPT pcb
there is a 12 wire connection to dsp pcb
maybe this could be the folloing signals
TEMP Heatsink           
TEMP of Air
PV1 Voltage
PV2 Voltage
PV1 Current
PV2 Current
PWM signal MPPT 1
PWM signal MPPT 2
GND
+12V from main supply
-12V from main supply
??? named O/P on pcb
 
 

 

PV1 side west (only 4 trina 400w in series)
I think this is what we all want to see😋

 
 
Gate drivers supply & Logic are independent of the power input of the pv inputs.
 
But also i had to correct myself of the Firmware changes :
Two changes are minimum to get it work,the subtraction value set to zero  &  the compare with 0,5A (value 50) set to 1 .
 
I made an BETA Firmware based on 90.06 with just this two changes (named to 9007).
(MPPT RANGE IS ORIGINAL 90-450V )
testet on EASUN & Axpert Max I 8KW
 
@Coulomb
i would be happy if you patch other files if there is a request .
Reflash.zip

INTRO:
Long ago i had the theory that Internal Supply of the inverter will cause currents on both mppts inputs which will interference with mppt regulation.
 
NOW IT'S PROVEN:
The simple solution is to pull of the plug on the supply pcb which is marked with "SOLAR".
The downside:   1. Loosing of Batteryless Operation .
                            2. Inverter will not start from PV inputs when its switched off by the button to charge the battery.
MPPT works now with a minimum current of 0.0002A    really   0.2mA   (first time i cant believe the measurement)
 
FIRMWARE Modification is still needed but just only a littlebit .....not so much as in the past.
 
@Coulomb
Only the subtraction value needs to be zero, no longer need to set the minimum MPPT voltage higher than 90V or reset mppt code. Maybe we can even lower this for maximum compatibility.(eg 60v like in the twin models)  
 
 
Here a picture of the disconnected plug (on the upper right)
The safest way is to completely disconnect your inverter from any powersource before pull of the plug .

 
RESULT :
 
I supply PV 2 input with a isolation tester which provide 250V
MPPT point found by the firmware at 168V and 0,000487A 
 
WOW this is 0,082 watts 😅
 
MAYBE IT CAN USE THE MOONLIGHT FOR SOLAR PRODUCTION??? I'll check
 

@Coulomb checked your changes and everything looks perfect.
 
@mjmx8k
Do you have a dc clamp meter for measuring the real pv input current? 
(Beware of using normal series current measurements with multimeter because of the non isolated dc bus )
My axpert inverter has an offset of 0.12A until 0.16A on both mppts.
If my inverter shows 0.2A the real measurements are 0.34A .
 
Maybe this could be the answer 🙂😂

With Patched firmware 90.06  it looks like this (0.2A is the magic point)
 
 
 

Second  BETA  release
still untested
 
changes : mppt min voltage 100V
7.2KW.zip

BETA FIRMWARE for Axpert max 7,2KW  (with removable Display )
 
(Based on  90.19).
(This Firmware is not testet !!!!!!!!!!!!! )
If you have a clone be careful (Error F90 is active in this release)
 
MPPT minimum Voltage is now 200V (if someone need this limit lower >>> let me know)
Most improvments are in low light and startup without direct sun (90V limit &  Power reduction below 0,6A MPPT input current)
 
if someone succesfully test this version please report here.
 
Use at your own risk
7.2KW.zip

BETA FIRMWARE for Axpert max 7,2KW  (with removable Display )
 
(Based on  90.19).
(This Firmware is not testet !!!!!!!!!!!!! )
If you have a clone be careful (Error F90 is active in this release)
 
MPPT minimum Voltage is now 200V (if someone need this limit lower >>> let me know)
Most improvments are in low light and startup without direct sun (90V limit &  Power reduction below 0,6A MPPT input current)
 
if someone succesfully test this version please report here.
 
Use at your own risk
7.2KW.zip

First Release for Axpert max 8KW  (with removable Display )
(Based on stable 90.06).
This Firmware is testet on original Axpert max 8KW from Solarpower24 and works great.
If you have a clone be careful (Error F90 is active in this release)
 
 
MPPT minimum Voltage is now 200V (if someone need this limit lower >>> let me know)
(if someone need individual MPPT minimum Limits for PV1 or PV2 inputs eg. 150V &250V  >>>let me know)
 
Most improvments are in low light and startup without direct sun (90V limit &  Power reduction below 0,6A MPPT input current)
There is another ~90v limit build in the Hardware,the current is very low (<0,2A) ,but maybe you will notice ( Internal power Supply will start to work ).
 
 
If there is something i missed, please report here
 
Use at your own risk
8KW.zip

First Release for Axpert max 8KW  (with removable Display )
(Based on stable 90.06).
This Firmware is testet on original Axpert max 8KW from Solarpower24 and works great.
If you have a clone be careful (Error F90 is active in this release)
 
 
MPPT minimum Voltage is now 200V (if someone need this limit lower >>> let me know)
(if someone need individual MPPT minimum Limits for PV1 or PV2 inputs eg. 150V &250V  >>>let me know)
 
Most improvments are in low light and startup without direct sun (90V limit &  Power reduction below 0,6A MPPT input current)
There is another ~90v limit build in the Hardware,the current is very low (<0,2A) ,but maybe you will notice ( Internal power Supply will start to work ).
 
 
If there is something i missed, please report here
 
Use at your own risk
8KW.zip