Huawei Joy-IT Transceiver 3,3V/5V - Questions

[indie89]

Good Morning,
I controlled my Huawei PSU over a regular MCP2515/TJA1050 for 2 months now (but WITHOUT the 3,3V/5V mod). For I experience more and more problems (higher voltage on the GPIO Pins seems to impact WIFI of ESP32 and seems to slowly "destroy" it). So I tried the mod including soldering etc but it somehow failed (even though the connections seem to be correct, when I measured it).
So ultimately I ordered a Joy-IT SBC-CAN01 and will hopefully receive it this week. I'll then use a new ESP32 and hopefully will not destroy the ESP using the separate 3,3V/5V power supply pins.

So I took a look at the pin mapping example in the wiki (https://github.com/helgeerbe/OpenDTU-OnBattery/wiki/Huawei-AC-PSU) and was wondering, why the cs pin was mapped to "0"? Is this for a specific reason or does this pin_mapping.json only serves as a general example?

I don't want to destroy anything, so I better ask in advance ;-) Thanks!

[Manos1966]

Hallo @indie89

I am also very interested to learn about this!
Can you please post some pictures on the kind of box you used to put your Huawei inside?

[indie89]

Hello @Manos1966 , I don't use any special box to put the Huawei PSU inside. My initial question is about the CAN transceiver from joy-it which can be powered by 5V AND by 3,3V simultaneously and that I want to use to control the Huawei PSU. I probably didn't get your question right, but can you pls explain your issue that you need help with, again?

[Manos1966]

Thanks for the quick answer.
I have all the parts but, did not yet dare to activate the systen yet.

I have two issues that cause ne concerns:

1. In what kind of construction/box should I put the Huawei in order to protect the naked wires that have 230V from one side and up to 50A from the other side. And, ensure that there is sufficient ventilation.
2. As I am using a VICTRON MPPT as well (and I am verry happy with its performance) I wonder what the impact will be if both Victron and Huawei try to charge the battery at the same time. I presume, if I lock the Voltage on both Victron and Huawei at the same value, it should work without problems. But I have seen no confirmation about this until now.

[indie89]

As I saw, that you are also German, pls refer to this forum for diy battery projects(https://www.akkudoktor.net/forum/stell-dein-batterie-powerwall-projekt-vor/nulleinspeisung-25kwh-lfp/ this is e.g. my project report), so that we can keep these posts/topics here as specific as possible. thanks!

[indie89]

Answered in #485 . I close the question.

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