Wire the MPPTs in series instead of having high current traces on solar sense.
Reduces parasitic impedance
Reduces the number of high current rated connectors and wires required.
Cheaper isolators
Current SPI isolators have a built-in power isolator as well, which is convenient but it’s more expensive than an external voltage isolator.
Ideally, the MPPT would power the isolated side directly from the array.
Use ADCs with SPI?
Only 1 type of isolator would be required.
Non-automotive relay?
Current relay is labelled on Digikey as “automotive”, but the datasheet doesn’t mention anything about automotive certifications.
There are much cheaper “non-automotive“ relays on Digikey that consume less power (as far as I know, the relay driver circuit on solar sense has not worked).
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