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ChanCafun is right, you definitely don’t want to connect any panel to the Mayfly’s SOLAR jack that has a voltage higher than 6 volts. I wrote a post about solar panel options earlier this year: https://envirodiy.org/topic/dying-batteries-in-winter/#post-2051
Since that post, we’ve released the Mayfly v0.5 that has the option for directly connecting up to 16v on the External Power input pins. But unless you’re leaving the logger on continuously and powering some current-hungry sensors, you should be fine with a 3.7v Lipo paired with a 3.5W, 6W, or 9W panel, keeping in mind that anything over 3W is unnecessary if you’re in direct sunlight (see my explanation in the post above).