I ordered this to test with a BN series common negative charge controller - it works perfectly! It arrived pre-programmed with ESP-Link firmware, setup was as simple as connecting to the ESP wifi, browsing to the ESP's web interface on http://192.168.4.1 and setting the name and password for the network I wanted to connect it to. I'm using socat on linux to connect the virtual COM port and Colin's scripts to dump data into InfluxDB for graphing in Grafana.
This is a well designed solution and I look forward to purchasing more when they're available.
I'm using this on an Epever Triron 30amp N series. Make sure to watch the associated videos on YouTube. You will need a programmer to configure the ESP8266, though I just wired up a USB to TTL adapter (https://randomnerdtutorials.com/flashing-nodemcu-firmware-on-the-esp8266-using-windows/) and it worked fine. I had the best results with the commercial COM2TCP program by Astrogeeks, referenced in the video. I also found that I had to run the Epever monitor in supervisor mode for it to work properly. Once its all said and done, it works great.
Hi Michael, Thank you for the positive review. I've configured all ESP modules up with esplink prior to dispatch so it should have already had the firmware on. I was using 2.2.3 but have moved to the newer 3.x versions for the revised pcb design. Regarding the com2tcp if you checkout my later videos I've had great success with the free application HW Virtual Serial Port. I shall put this on the listing also with some more instructions also.