“Seems to do the job. I initially had problems with the PI rebooting every 6 hours or so. Checking the low voltage history ( vcgencmd get_throttled ) I could see there was an under-voltage problem. Output of the UPS was 5.1v but the 5v rail on the pi was 4.2v. The problem was a voltage drop on the sprung pin that connects the UPS to the Pi and it turned out that both contacts needed a good clean (Also recommend doing the same to GND too )”
“The HAT functions exactly as you could expect. It maintains power to the PI when mains is interrupted. It's worth mentioning that alignment can be a bit finicky while making sure the pogo pins are correctly positioned as you screw together the HAT and the Pi. So be prepared for that. I can recommend doing this on a flat table to ensure you don't have to use two pairs of hands to align them.
Great bit of kit and essential if you want to keep your Pi online no matter what.”
“I use the Rasspberry Pi for my smarthome system. Due to the hazard of a possible damage of the SD-card file system an uninterruptible power supply is in my opinion indispensable.
The method of mounting the UPS HAT makes ti possible, to keep the smarthome hat on it's place.
A perfect solution - in my mind
Thanks for providing this great product”
“With modified script this can turn off itself at desired %.
Main biggest issue I encountered is trickle charge. Battery would stay ~90% and current constantly going between positive to negative. This will kill the battery life very quick unless I've done something wrong or mine is faulty.”
“Make sure to follow the instructions for installing the unit, but one installed worked perfectly. I also found a HACS add-on for Home Assistant to monitor the attributes of the board over I2S, and perform automation based on that data if needed (e.g. perform safe shut down if on battery and remaining power gets too low). See: https://github.com/mykhailog/hacs_waveshare_ups_hat”
“Class, I have it set up on a pi running as a NAS. I edited the supplied python script that monitors the battery level to turn off the pi should the power go too low to save my files from corruption. It's a great purchase!”
