This circuit is used to measure the current from a solar panel. It has very low power loss for currents in the 0-10A range. It also works as a general purpose DC current meter. The circuit can be used on either the positive or negative side of a DC circuit. Solar Panel Current Meter Circuit Diagram Specifications Measured Current: 0-10 Amps DC, can be increased by changing the resistors. Circuit Voltage: Will work with DC circuits at any practical voltage. Accuracy: approximately 2% with a high quality meter movement. Theory The current to be measured flows through the 0.01 ohm resistor, this causes a small voltage drop across the resistor. 10 amps of current will produce a 100mV voltage across the resistor. The 100 microamp meter is wired in series with a 50 ohm fixed resistor and a 500 ohm variable calibration resistor so that it can measure the voltage drop. The 500 ohm variable resistor is used to adjust the meter's full scale reading. The 50 ohm resistor limits the maximum cur...