Reply To: How to determine battery and power supply

If you’ve got 4 heated sensors that require constant 12 volts, then I don’t think the Mayfly and the standard “battery/solar panel combo” is going to be sufficient.  It would be a struggle for the Mayfly to supply the necessary continuous 100ma at 12v for the heaters, in addition to powering the various sensors intermittently.  You could have a separate 12v battery with it’s own 12v solar panel and charge controller to power the sensor heaters, and then use a 12v-to-5v converter to power the Mayfly via the USB jack.  Then you wouldn’t have to worry about the smaller Mayfly battery and solar panel, and the bigger battery/panel combination should be sufficient for powering your whole setup.