R3plic8

Thanks for the advice, It is a used unit from a friend that changed system. so its a 15 tube system, with 10 used tubes(with vacuum) and 20 new tubes  in boxes.

He managed to contact the people who installed it, they said that it would run fine at 400Kpa as long as the heat pipes are used in the excavated tubes instead of running your water through the tubes which would do on a low pressure geyser where the tubes fit into the geyser above it. He says the header manifold should be able to handle 600kpa. So im hoping that is correct.



 

Yes, you do not want to be using the power pin from the axpert RS232, unless you using some sort of buck converter which i wouldn't recommend doing, unless you know whats going on.

Sorry i Also Forgot about the nodes limitations on hosting a USB to UART.. This is not Implemented in the ESP32, But has been mention of it possibly in futureversions.
From my side the RS232 is perfect and via node gives me the outputs i need to pass via HA with out the extra added cost of a pi.

But yes, IF you do not know what you doing, i'd rather suggest sticking to a easier solution. Otherwise reading up on all the threads and documentation

This part is important.  The ESP, Arduino, STM32, etc. all use TTL level RS232, so 3.3v or 5v.  If you connect it directly to an Axpert inverter it will fry the RS232 port or the ESP/Arduino/etc.
That won't work.  Axpert inverters doesn't use UART over USB converter.  They expose the device as a USB HID device.  It is also exposed as a device, not a host.  So you need a USB host (if you don't know what this means, stop now because it is going to get much, much harder and more complex).  This is non-trivial to implement, or maybe it has been implemented already for ESP32.  Considering that RS232 is more reliable and is a synchronous protocol (USB as asynchronous), highly recommend sticking to RS232 when possible