I need to boost 4.2V (out of MPPT/ 18650 battery charge) to 5V (input for ESP8266.) To accomplish that I've bought this item, a 2.0 - 24V boost converter, which supports 2A.
But when trying to do so - though voltage is converted as needed and does not drop during boot - the MCU does not power up.
I tried to add 100 microfarad capacitor at input and output of the converter. No luck.
Is there a way to "fix" this converter to power an MCU?
If not, what type of converter would be suited for the job?