Using 12V battery with notecarrier

Hardware
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Hi – I have a solution that will need to be able to drive various sensors; power budget wise I can run the show using a 12V LiPO or AGM + 12v solar – I don’t want to use separate power supplies – as much as I love that the carrier cards have a solar and batt, but limited around 6v or so.

Not so much a blues question but I figure this setup is a common one. I can drop the 12v to voltage acceptable to the notecard but was losing ~6ma quiescent current ( LM7805 ) whilst the notecard is at a nice 10uA ; does blues have a reference design for this setup or a recommendation?

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Did some research. A decent solution with stated 100uA draw is a converter based on AP63357 from Diodes, aka “SparkFun 5V Buck Regulator” . This will get me 5V to run the notecard, plus a 12V7AH LiPo as source. But then I need to add a 12v solar charge circuit + panel.

Alternatively, A boost converter can bump the voltage up, my external device can run 5v - 12v input, the TPS61200 based converter at sparkfun has a 55uA cost. With this setup I can leverage the notecarrier batt and solar and add only 1 part.