you can just use the handy INA219B chip on this breakout to both measure both the high side voltage and DC current draw over I2C with 1% precision.

Most current-measuring devices such as our current panel meter are only good for low side measuring. That means that unless you want to get a battery involved, you have to stick the measurement resistor between the target ground and true ground. This can cause problems with circuits since electronics tend to not like it when the ground references change and move with varying current draw. This chip is much smarter - it can handle high side current measuring, up to +26VDC, even though it is powered with 3 or 5V. It will also report back that high side voltage, which is great for tracking battery life or solar panels.

Specification:

3-5v power 12 bit ADC Uses the INA219B chip 0.1 ohm 1% 2W current sense resistor Up to +26V target voltage Up to ±3.2A current measurement, with ±0.8mA resolution if you change the resistor (0.01 ohm to measure up 32 Amps with a resolution of 8mA) This board/chip uses I2C 7-bit addresses 0x40, 0x41, 0x44, 0x45, selectable with jumpers

the current sense resistor is between the screw terminals (possibly also the vin+- on the pin headder)

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