elman

Here are some schematics that I reverse engineered from Anern Victor Max 10.2kW inverter. Should be very similar to Axpert VM models. Of course, part references and connector pinouts are different. Also ADC and GPIO assignments do not match genuine Voltronic's.
The SCC board schematic is complete - PV boost circuit, voltage and current measurement, AC power supply and bus soft start circuit.
Then there's a schematic of the two power supplies on the main board - this inverter uses an auxillary 150V power supply to start from the battery.
Also a I attempted to trace the analog part of the control/DSP board. This was little bit harder as there were no printed part references on the board. But all op-amps are there, nothing important (for understanding the circuit function) should be missing. [15/Aug/2025 added the remaining "digital" part]
I think there will be some errors, so every feedback is appreciated. I can provide KiCad project files if anyone is interested.

Can you add DSP Board 2/2 Drawing also

Not yet. I'm still at the very beginning of drawing part 2/2, hopefully I'll be able to finish it later this year. But I do have the board on hand so I can provide some part values/pinouts if needed.

Looking forward for your drawings. In mean while can you share high resolution pictures of Main Board, MPPT Card and Controller card, either in full or in parts. Both sides of PCB's. Thanks

Here are some photos. Not great but I tried my best.
To avoid confusion, I have to note that I've made some modifications on the main board. I have three of these boards (got them as not-working) and all of them had signs of arcing around the drain of Q71 or TX9's primary winding. On this particular one, U10 and R255 was faulty. There were some unsuccessul repair attempts from the previous owner.
After replacing the parts (including Q71 which still measured OK), I decided to also remove R249/D64 and install the unpopulated RCD clamp to reduce the voltage spikes. Used 3.3nF capacitor for C143, 150k/3W resistor for R245 and some diode that I don't remember. That didn't work out, the same parts blew again after a few power ons (exactly when the soft start turned off and SPS_IN raised to the bus voltage). BUT most likely due to my mistake that I didn't check R253 which was already open-circuit. Wrongly suspecting the RCD clamp's diode to be too slow, I deciced to try an RC snubber instead, consisting of a 100pF/3kV MLCC capacitor and 33R/5W resistor, connected between source and drain of Q71. Only then, watching the waveforms on the oscilloscope, I realized that the duty cycle is constant 50% and the power supply keeps switching off and on by the optocoupler feedback. That lead me to the R253 1k resistor. After replacing it, everything works fine and the waveform on the drain of Q71 looks nice so I left the RC snubber there, not trying to revert to the RCD clamp. So that's the current state of the main board on the photo.
Also I swapped the DSP, the orignal one was TMS320F28062PZT, this one is TMS320F28066PZT (differs in memory size), but this is only related to my experiments, not a malfunction of the inverter.

is it safe to run the Main power supply without the RCD Snubber circuit? i got one inverter with failed UC3845... but the Q71 mosfet is not damaged. this is the first design that i see without RCD Snubber. Is this cost saving or something else?

Some more schematics here. These are from Easun SMW 8kW which is, I believe, identical to Axpert Max 8kW. In this case the control board did have part references printed so most of those in the schematic should be correct. It's a multilayer board but only power planes are on the inside layers so it's not that hard to trace. The main difference, compared to Anern, is that this board uses multiplexers for 8 of the ADC's inputs, increasing total number of available analog inputs to 24.
I also made a schematic of the SCR board and some fragments of the main board.
I'm not going to make schematics of any power supplies as these are already pretty obvious. Just note that the topology in this case is different from Anern's. There's no intermediate SPS_IN (150V+) branch. The main power supply and bus softstart are located on the main board and powered directly by the battery voltage through a diode. The grid/AC power supply and solar power supply are on a separate board, both of these output around 63-66V and also provide power to the main power supply through diodes. Unlike Anern's, this topology does not need a relay in the softstart circuit.
I made a note of some critical parts (MOSFET type, shunt resistor value and how they deal with voltage spikes):
main SPS: JCS86N25WT, 0.15R, RC snubber 2x47R (parallel), 2.2nF
softstart: SIF13N50C, 0.62R, RC snubber 2x22R (parallel), 220pF
grid SPS: SVF9N90F, 0.47R, RCD clamp 15k/5W, 10nF
solar SPS: SVF9N90F, 0.47R, RCD clamp 15k/5W, 10nF
Original KiCad files and PDF schematics are available on my GitHub: https://github.com/solar-pwr/axpert/
There will be errors as usual, so every feedback is appreciated.