HELP !! arduino solar panel battery and 2 motor servo

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can i make a voltmeter just with an arduino?

yes, even a 6 channel voltmeter, looks like

//
//    FILE: Voltmeter.pde
//  AUTHOR: Rob Tillaart
//    DATE: 2012-12-27
//
// PUPROSE: 6 channel voltmeter
//
int pin[] = { A0,A1,A2,A3,A4,A5 };

void setup()
{
  Serial.begin(115200);
}

void loop()
{
  for (int i=0; i<6; i++)
  {
    analogRead(pin[i]);  
    float voltage = analogRead(pin[i])*5.0/1023;
    Serial.print(voltage, 3);
    Serial.print("\t");
  }
  Serial.println();
  // delay(100);
}

Output can easily be copied into Excel or so.