I had a very cheap solar panel + controller where the controller died. To cheaply replace it I was going to build my own using some parts I had laying around and use a step-down (LM2596) to limit voltage from the solar panel into a battery and out to a XL6009E1 to boost battery voltage up to 5 volts to an esp cam. Super simple circuit diagram as follows:
Solar panel == LM2596 == battery == XL6009E1 == ESPcam
while testing this circuit out on my bench power supply, before hooking the ESPcam up or battery, I noticed that at about 3.9 volts input on the LM2596 I am seeing 19 volts output on the XL6009E1! Checking on the output of the LM2596 I am seeing 3.2 volts.
Bench Power Supply == LM2596 == battery holder (no battery) == XL6009E1 == multimeter
Is this some limitation of the XL6009E1?
When I increase the voltage to >5V everything seems to smooth out, but will a dying battery fry my espcam?