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On solar sense, there is an MPPT_Interface schematic sheet. I think it would make sense to move the isolated components to the MPPT (the buffer could be removed in that case).
Here’s some research that was done previously: DIY MPPT
Other pages to be aware of in regards to Nomura MPPT Testing:
Nomura SPI Testing Nov 19/20 2019
Nomura MPPT - Documentation for Nomura MPPT and SPV1020 IC
MPPT Testing - Testing done in 2017 by Taiping
Solar Collector System Analysis Workterm Report - Work term report about Solar (including MPPTs)