Embedded Files
System Block Diagram
System Block Diagram
Overall the power management system is fairly straight forward. Once the Arduino boots up, it begins to take readings from the three sensors. It then performs a window average on for both the current senors and stores those values for runtime calculations. The runtime is calculated based off the current in and out, and the voltage of the battery. From there all this information is displayed on the LCD. If there is an issue with the system the user can restart the Arduino using the restart switch on the main control panel.
Overall the power management system is fairly straight forward. Once the Arduino boots up, it begins to take readings from the three sensors. It then performs a window average on for both the current senors and stores those values for runtime calculations. The runtime is calculated based off the current in and out, and the voltage of the battery. From there all this information is displayed on the LCD. If there is an issue with the system the user can restart the Arduino using the restart switch on the main control panel.
Window Average
Window Average
A window average, averages data over a specified range. The range in this case is 100 readings or numReadings. The totalOUT is all the points in the array for the output current sensor. The last value in the array is subtracted from the total. The current sensor is read again, then the new reading is added to the total points in the array. The index value is then incremented to properly move the array forward by one place. Then the total points are divided by the number of readings in order to determine the windowed averaged output current, and the process repeats itself.
A window average, averages data over a specified range. The range in this case is 100 readings or numReadings. The totalOUT is all the points in the array for the output current sensor. The last value in the array is subtracted from the total. The current sensor is read again, then the new reading is added to the total points in the array. The index value is then incremented to properly move the array forward by one place. Then the total points are divided by the number of readings in order to determine the windowed averaged output current, and the process repeats itself.
Run Time Calculation
Run Time Calculation
The run time calculation tells the user how much longer they can use the TOP at the given load. First the measured voltage, vin, is subtracted by the minimum battery voltage or battmin. The minimum battery voltage is 9 volts. If the battery goes below 9 volts the battery bank will be permanently damaged depending on how low the voltage goes, and it will not hold as much charge again. The value from Vin minus battmin is then multiplied by the amps per volt. The amps per volt of the battery bank is 28.88 A/v. The battery has 100 usabel amps and has a usable voltage range form 12.6 to 9 volts, so 100 / 3.6 = 28.8. From there, the incoming amps, AmpsIN, are added to the amps in the battery and the amps leaving, AmpsOUT, are subtracted. Finally we are left with the the number of hours you can run a given load.
The run time calculation tells the user how much longer they can use the TOP at the given load. First the measured voltage, vin, is subtracted by the minimum battery voltage or battmin. The minimum battery voltage is 9 volts. If the battery goes below 9 volts the battery bank will be permanently damaged depending on how low the voltage goes, and it will not hold as much charge again. The value from Vin minus battmin is then multiplied by the amps per volt. The amps per volt of the battery bank is 28.88 A/v. The battery has 100 usabel amps and has a usable voltage range form 12.6 to 9 volts, so 100 / 3.6 = 28.8. From there, the incoming amps, AmpsIN, are added to the amps in the battery and the amps leaving, AmpsOUT, are subtracted. Finally we are left with the the number of hours you can run a given load.
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