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Parts: 1pc Current sensor (SEN0098) 1pc Voltage divider (ST0430X5) 2pcs 5v regulator* (B06W54L3XK) 1pc Arduino Teensy 3.6 1pc LCD I2C 20x4 (B07PWWTB94) 1pc Push to make switch (CLW1078) 2pcs Resistors 2.7k

*Follow wiring diagram. Do not use a single voltage regulator as this will result in the current sensor failing.

Download Teensyduino to program teensy board: https://www.pjrc.com/teensy/td_download.html

Code info -Set time and date for time of turning on logger (not compile time) -Current sensor and voltage sensor must be calibrated using offset and multiplier values. -SD card can be removed to load data to PC at anytime. However, if the hour value changes, a log will be missed. So it's best to remove the SD card a few minutes into an hour and return within the hour. -The data log text layout is (Hour:Minute; Day/Month/Year; Volts, Watts, totalWattHours).

Calibrate Voltage Sensor

  • Read the raw volt value with no current draw, this is the offset value.
  • Apply a know current draw (measured from external wattmeter or charge controller).
  • Divide the reading by the known current draw, this is the multiplier.

Calibrate Current Sensor

  • Read the raw amp value with no current draw, this is the offset value.
  • Apply a know current draw (measured from external wattmeter or charge controller).
  • Divide the reading by the known current draw, this is the multiplier.