Keeps my power bank alive when powering most low-powered devices I tried. Easy to assemble (provided you can solder and can read resistor colour bands) and the optional case fits perfectly. I might recommend adding a marking on the pcb to differentiate the male and female usb connectors, as one could solder them in the wrong positions. I figured it out by looking at the photo. Maybe I missed something? But this only took two minutes to figure out.
Dec. 13, 2020
The Keep Alive Timer kept my powerbank alive as described.
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.
Response from Colin Hickey | Oct. 30, 2018
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.