What’s inside a REAL maximum power point tracking charge controller. The guts are fairly standard for a simple low end MPPT controller. The brains of the unit consist of a PIC16F88 microcontroller. An LMC6484 quad operational amplifier is used for the current sense and temperature sense signal processing. There are also an LMC7660 potential inverting charge pump driver (which I THINK is used as a negative potential supply for the LMC6484) and an IRS2183 integrated driver MOSFET half bridge (which is probably used as a driver for the buck converter switching MOSFET).
If any of you watching this are BZ Products engineers and want to elaborate on the specific functions of anything, feel free to do so.
And yes, the black box in this one really is a relay.
One of the advantages of something not made in China (this was made in St. Louis, MO).