you can get really small dc-dc converters that are suitable for the power draw of a pi. Take input of 12, 24, 36, 48VDC, whatever, convert it to 5VDC and power

you can get really small dc-dc converters that are suitable for the power draw of a pi. Take input of 12, 24, 36, 48VDC, whatever, convert it to 5VDC and power the header pins of a pi. take a look in some of the subsections here: https://www.pololu.com/category/131/step-down-voltage-regulators https://www.pololu.com/category/131/step-down-voltage-regula...