Jamil Tulimat

Ad.1 I use APL too because keeps 0A charging battery from grid at bypass in SBU and "Solar only".
At UPS it is drawing  2.7A from grid(135W). It's stable 2.7A not cycled. It is 6kW model.
Inverter LCD panel do not show charging battery but BMS and clamp meter yes.
More... inverters grid usage do not measure it so it is big gap between load+battery charging and grid usage if inverter is in bypass at UPS+SBU+Solaronly combo.
Ad2 Yes but is very little noticable for me (noticed it after 2 month of use inverter) so do not bother me at all .I think is noticable more at low SoC of battery.

Thanks @Jamil Tulimat. You've given me the idea of testing the UPS mode. It hadn't occurred to me. I'll check how it behaves.
However, do any of you know or have measured whether your inverters behave in a similar way in 4Kw or 6Kw? As @Coulomb said, it seems reasonable that it uses reactive energy, but I'd like to compare with the rest of you, if any of you have the data, whether so much reactive energy is normal in these models, or is it a particular case of my inverter.

Hello. This morning I've been tinkering with the inverter. I've already had a chance to take a photo of it. I'm updating the screen firmware and testing its operation.
Below is a photo of the inverter and its label:
 
 
As I mentioned in a previous message, I have already updated the inverter to version 60.10, but the screen was still on version 25.12. Today I took the opportunity to update to version 25.15.
The update went well the first time and everything worked correctly. Tomorrow we will see if it has served to correct the problem of starting in 24V mode.

Regarding the other 2000W problem, which did not improve with the update to 60.10, I have tried to see the behavior by changing the "AC Input Range" parameter from APL "Appliance" to UPS. When changing to UPS, the consumption dropped radically to about 325VA.
So, with APL and the round metal button not pressed, the consumption from the grid is around 40W, with the round metal button pressed, the consumption rose to 2000VA.
Now, with UPS, with the round metal button not pressed, the inverter consumption from the grid is around 40W, with the round metal button pressed, the consumption increases to 325VA. And if I turn on the batteries in SBU mode, the consumption from the grid drops to 0W. This is the desired and expected behavior for me.
The software updates of the inverter have not affected this behavior, and I believe that the inverter works correctly at this point, and I am just discovering how the parameters affect the behavior of the inverter.
 
When I have more data on whether the screen update has positively affected the 26V start, I will continue to report.
 
 
 
 
 

No ofc it only happens when on inverter mode(sun and no sun), so no grid , no regulators. just pure chinese juice
all ratings seem fine the only thing i think about is that there is a problem in the output waveform , the only access to an osciloscope is in my college and they r not planning to lend me one 🥲 

1- The only thing similar to this that i noticed is when i put the inverter mode on UPS it repeatedly draws about 1Amps AC on and off and on the battery end at the same time it cycles between drawing 1.5A at 25v which is the normal no-load draw to 0.4A and then again to 1.5 and so on.... 
I changed it back to APL and it stopped doing those weird draw patterns.
 
2- A question for fellow 4kw VM-III owners : Do you guys notice  flickering on neon or incandescent lamps 
because some times the flickering becomes noticeable to an annoying level !
and by the way i tried with no-load , high-load and it's the same.
 

no it only goes down which is annoying if u skipped the setting u want you'll have to to go over again from the start🫠

That second sine wave is intense, I can just image how much hormonic distortion is on that signal. To be fair, having seen standard eskom power on an oscilloscope, it is not always a perfect sine wave, depending on what is running in your neighborhood. At uni we had large aircons running and there was quite a bit of distortion on the power line from eskom.

Those phase chopping dimmers are evil in mu opinion. I'm not surprised they upset many inverters.

Hello i have a question that have been on my mind for a while and i couldn't find much abt it
I have seen some people that argue abt the effect of resistive loads or induction cooktops that have a Dimming capabilities
some say its not recommended for the inverter and some say it'll affect the sinewave purity and affect other electrical equipment that are running off the inverter 
has anyone done some tests to see how different load types affect the output using an oscilloscope ??
 
" images attached are from a video i found that tested the output when using a common dimmer circuit on a resistive load this is the outcome : RIPPLES "

[ Edit: There is a problem with this patched firmware; DO NOT USE!
See here for the corrected version, now called x60.96, but still based on factory firmware version 60.95.
It may be that unpatched factory firmware version 60.95 has fixed the PV voltage stuck bug, and no patched firmware is needed at all, possibly other than 860.95 that fixes only the premature float bug. ]
 
Well, that was a bit ambitious; sorry for the delayed release. Since I'm not really closer to solving any of the charging bugs, here is the patched 60.95, just like 60.06, but with one other patched file that just has the premature float bug fixed (see below).
These are patched firmwares version 860.95, 260.95, 560.95, 160.95, and 960.95, all based on factory firmware version 60.95 for the Axpert VM III Twin 6kW and 4kW, and the Axpert VM IV Twin 6kW and 4kW. These patches implement most of Georg's MPPT "stuck at 90V" patches (here it would be "stuck at 60 V"), and fix the premature float bug. The only parts not applied are for the forward current constant, which doesn't seem to be changed based on solar voltage in any VM firmwares. The version number should display in full when using monitoring software, but will still show as 60.95 on the front panel display. Do not use with any other models, not even older VM III and VM IV models with power ratings like 5 kW or 3 kW, or non-twin models. Use at your own risk.
In the reflash tool, you may have to navigate to the folder with the patched files the first time it is run. Choose the hex file with the minimum MPPT voltage that you want:
860.95: float bug only
260.95: 200V min MPPT
560.95: 150V min MPPT
160.95: 100V min MPPT
960.95: 90V min MPPT
Use the 200 V variant if your PV panels are nearly always well above 200 V. Otherwise, use the 150 V version if your panels are almost always above 150 V. Use the 100 V version if your panels are particularly low in voltage. Try the 90 V version only if you have just 3 panels, the very bare minimum.
You can also of course choose the original factory firmware.
Firmware upload instructions.