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This wouldn’t be possible using the built-in solar chargers on the Mayfly board. But it would be possible to have one separate main 6v-12v battery and solar panel (with appropriate external solar charge controller), and then you could just connect both Mayfly boards to that one battery via the Mayfly’s “External 4-12v” jack. Something like a 6v SLA battery with a small panel and controller would be pretty cheap and would have plenty of capacity to power two (or more) Mayfly boards.