Fan 12V With Current Sensor and 20x4LCD Arduino PowerSupply 12V3A Power Cost in SAR

#include <Wire.h>
#include <Adafruit_INA219.h>
#include <LiquidCrystal_I2C.h>

float cost_per_kWh = 0.18; // in SAR Residential is 18 Hallala/kWh
Adafruit_INA219 ina219;
LiquidCrystal_I2C lcd(0x27, 20, 4);

void setup() {
  Serial.begin(9600);
  lcd.init();
  lcd.init();
  lcd.backlight();
  // Initialize the INA219.
  if (! ina219.begin())
  {
    Serial.println("Failed to find INA219 chip");
    while (1) {
      delay(10);
    }
  }
  // To use a slightly lower 32V, 1A range (higher precision on amps):
  //ina219.setCalibration_32V_1A();
  // Or to use a lower 16V, 400mA range, call:
  //ina219.setCalibration_16V_400mA();
  Serial.println("Measuring voltage, current, and power with INA219 ...");
}

void loop() {
  float shuntvoltage  = 0;
  float busvoltage    = 0;
  float current_mA    = 0;
  float loadvoltage   = 0;
  float power_mW      = 0;
  float cost_SAR      = 0;

  shuntvoltage  = ina219.getShuntVoltage_mV();
  busvoltage    = ina219.getBusVoltage_V();
  current_mA    = ina219.getCurrent_mA();
  power_mW      = ina219.getPower_mW();
  loadvoltage   = busvoltage + (shuntvoltage / 1000);
  cost_SAR      = ((power_mW * cost_per_kWh / 1000) / 1000)*30;

  Serial.print("Bus Voltage:   "); Serial.print(busvoltage); Serial.println(" V");
  Serial.print("Shunt Voltage: "); Serial.print(shuntvoltage); Serial.println(" mV");
  Serial.print("Load Voltage:  "); Serial.print(loadvoltage); Serial.println(" V");
  Serial.print("Current:       "); Serial.print(current_mA); Serial.println(" mA");
  Serial.print("Power:         "); Serial.print(power_mW); Serial.println(" mW");
  Serial.println("");

  lcd.setCursor(0, 0);
  lcd.print("V = ");
  lcd.print(loadvoltage);
  lcd.print(" V");
  lcd.setCursor(0, 1);
  lcd.print("I = ");
  lcd.print(current_mA);
  lcd.print(" mA");
  lcd.setCursor(0, 2);
  lcd.print("P = ");
  lcd.print(power_mW);
  lcd.print("mW");
  lcd.setCursor(0, 3);
  lcd.print("$ = ");
  lcd.print(cost_SAR);
  lcd.print(" SAR");
  delay(1000);
}