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  • 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 or an MPPT with I2C?

    • 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).

  • If the PCB is smaller, it might be cheaper to have a 4 layer PCB, rather than a 2 layer PCB with 2 oz copper.

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