# Using 12V battery with notecarrier

**URL:** <https://discuss.blues.com/t/using-12v-battery-with-notecarrier/2252>\
**Category:** Hardware\
**Created:** [July 26, 2024, 3:10am UTC](https://discuss.blues.com/t/using-12v-battery-with-notecarrier/2252 "2024-07-26T03:10:04Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![gomario2](https://avatars.discourse-cdn.com/v4/letter/g/dfb087/32.png) [@gomario2](https://discuss.blues.com/u/gomario2)\
**Post date:** [July 26, 2024, 3:10am UTC](https://discuss.blues.com/t/using-12v-battery-with-notecarrier/2252/1 "2024-07-26T03:10:04Z")

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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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<div class="post-metadata">

**Author:** ![gomario2](https://avatars.discourse-cdn.com/v4/letter/g/dfb087/32.png) [@gomario2](https://discuss.blues.com/u/gomario2)\
**Post date:** [July 27, 2024, 5:03pm UTC](https://discuss.blues.com/t/using-12v-battery-with-notecarrier/2252/2 "2024-07-27T17:03:58Z")

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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.