DSN-VC288 Voltmeter-Amperemeter quality issues

[Tronx]

Do some of you use these chinese Vm Am modules which are a bit inaccurate for Ampere measurements, but quite ok for voltage, and have experienced total loss?

I'm running these modules connected via a 7805 to a solar panel. So they get 5V Vin, and when the sun shines, they turn on, and if the solar panel voltage is too low, they turn off.

I had 2 of them fail (completely dead, no LEDs, only the voltage regulator still gives 3.3V), and I fear more to come. It seems that these modules die from undervoltage in some conditions where the voltage slowly decreases.

I did not find this out myself, but they say this in a german forum and their explanation seems plausible.

My modules have chips with the STM8 pinout. I suppose that they are chinese copies with flaws.

Does anyone have the same issues with these modules, or other products where chinese microcontroller clones fail similarly?

 

[maxpower]

Electronic circuits are not always tolerant to continuous brownouts Chinese or otherwise. One should also consider adding transient suppression to devices connected across solar panels.