December 25, 20223 yr Hello to all hardware hackers and software reversers from this forum. In the rush for cheap inverters, I bought a clone inverter of the Infinisolar V2 Daxtronm BGH-5KW. (looks exactly like Easun SV2 (Infinisolar V2) - a model very popular now in my country. The only difference / problem that I noticed is that it does not work without batteries connected. If I have only AC IN connected, as soon as I turn ON the AC out from the power switch it shows error 09 - bus soft start failed. It does not go into bypass mode. I had a look on the schematic diagram (many thanks @Coulomb- great work there), i also did a side by side comparison with EASUN SV2 (Infinisolar V2) and I noticed that U11 is missing from the Daxtronm PCB board (please see 4th photo). I also noticed that on the EASUN SV2 when in bypass mode, voltage on PV input (no PV's connected) rises to ~41...48[V] and on Daxtronm is only to 10...12[V] Any ideas how to make it work without batteries? (like EASUN SV2 does?) Could this missing U11 be the issue? Any thoughts/ideas would be greatly appreciated! Main DSP is TMS 320F2809P7A, FW ver: U1 52 20.
December 26, 20223 yr 19 hours ago, sethmad said: Could this missing U11 be the issue? Perhaps. I've never noticed that AC_ON input in any firmware, but then I've never had a need to find it. Looks like you'll need a through-hole U6 as well, unless there is an SMD U6 under the board. This seems like penny pinching in the extreme. Or perhaps chip shortage in the extreme.
July 9, 2025Jul 9 Author after more inspection(repair) of other inverters, I noticed that the mainboard is actually from an offgrid inverter, this is why it is missing the U6. However, it works good and is reliable for 2 years now.
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