I vote SQLite even half awake half sleep since Google & Apple does:Google & Apple engineers has higher IQ than industry averageGoogle & Apple engineers get higher pay than industry averageGoogle & Apple has more resource
ThanksThat would be an option but as I mentioned, everything is placed inside a box, and installed in machines placed in industrial companies, so the USB chargers would very easy to steal or unplugged. That's the reason because I want a iternal power supply. The fact is that isn't easy to find one with specifications similar to the USB chargers.
I vote Apple iPhone power adapter here.
...Keep in mind that the Mean Well supply you're looking at is a component, not a finished power supply system. Unlike wall-wart supplies, or power supply bricks, it's just one part of a finished system. It is still your responsibility to enclose it properly, provide proper wiring and fusing, and prevent accidental contact with the supply conductors.
...The 80 mV ripple doesn't bother me too much, it's 1.6% of the output voltage, and less than the 2% regulation specification. If the ripple worries you, add an output filter capacitor - put it on the custom board near the VIN pin. The module CrossRoads recommends has double the ripple on the output (150 mV.)...