Issue to retrieve datas from inverter HM300 with openDTU+nrf24l01+

[mat2lille]

Hello
I tried for 2 weeks to connect my esp32vroom + NRF24L01+ including openDTU firmware + device profile ahoyDTU but after several times, still impossible to retrieve datas from inverter HM300 hoymiles.

I can see the interface but the status of the inverter stay in red, datas displayed to zero.

Here is an extract of logs from console:
RX Period End 10:03:45.991 > All missing 10:03:45.991 > Nothing received, resend whole request 10:03:45.991 > TX AlarmData Channel: 61 --> 15 81 63 98 71 80 16 07 76 80 11 00 67 94 A8 EC 00 00 00 00 00 00 00 00 C5 3C 26 10:03:46.841 > RX Period End 10:03:46.841 > All missing 10:03:46.841 > Nothing received, resend whole request 10:03:46.841 > TX AlarmData Channel: 75 --> 15 81 63 98 71 80 16 07 76 80 11 00 67 94 A8 EC 00 00 00 00 00 00 00 00 C5 3C 26 10:03:47.637 > RX Period End 10:03:47.638 > All missing 10:03:47.638 > Nothing received, resend whole request 10:03:47.638 > TX AlarmData Channel: 3 --> 15 81 63 98 71 80 16 07 76 80 11 00 67 94 A8 EC 00 00 00 00 00 00 00 00 C5 3C 26 10:03:48.462 > RX Period End 10:03:48.462 > All missing 10:03:48.462 > Nothing received, resend count exeeded

Any advise ?

I've also tried to put a 10uf capacitor, no changes.

Pins have been set up as required in the standard configuration.

My esp32 vroom has been flashed directly online with openDTU flash tool.

I use also a power supply with 2A, seems to be ok also.

Inverter is correctly connected with green led

Thank you in advance

[schneeer]

You operate the NRF24L01+ with an adapter.

AZ-Delivery writes:
"The AZDelivery adapter board for the NRF24L01 8-pin wireless transceiver module can be used with the NRF24L01 radio module.
The AMS1117 integrated DC-DC voltage regulator regulates the voltages in the range from 4.8V to 12V, down to a stable 3.3V, which is required for the operation of the NRF24L01+ module."

You run it with 3.3V, that might not be enough, you should run the adapter with 5V.

[mat2lille]

Ok thanks for the answer, will try and revert. 👌

[mat2lille]

Ok for the moment nothing change, same informations in the console. But i assume it is normal during the night. Will try again tomorrow morning

[mat2lille]

Hello again... Same as yesterday, nothing changes. All is ok on the configuration... Can it be an issue on the inverter ?

[mat2lille]

For the serial number, you confirm I have to use this one ?

[mat2lille]

Ok... I finally found the issue. It works but need to have the nRF24 module really close to the inverter... Perhaps have to switch to a cmt2300a module

[schneeer]

OK. But at least it works now.

You have to stick with the NRF24L01+ radio module, the CMT2300A is for the HMSxxxx inverters, that doesn't work for you.
You can increase the transmission strength of the NRF24L01+ in the OpenDTU settings. But that will hardly achieve anything; This does not change anything in terms of reception and has no influence on the reception and transmission power of the inverter.

You can try to influence the antenna properties.
Someone here and here has already thought about it.
The 2nd link is about the CMTxxxx, but the topic can also apply to the NRFxxxx.

Furthermore, the cables to the NRFxxxx radio module should not be too long and an electrolytic capacitor with around 100µF at the operating voltage near the NRFxxxx radio module is always useful.

[mat2lille]

Yes you're right. thanks for reply, i think i will set up the esp32/nRF24 close to the inverter.