Operation of vehicle accessories based on predicted runtime of a primary system

1. A method for efficient power management of a finite power storage unit that provides a finite amount of power to a vehicle accessory, the method comprising:

receiving an input parameter, wherein the input parameter includes one of a desired runtime for the vehicle accessory and a desired condition setting for the vehicle accessory;

receiving an environment data;

a processor determining an output parameter based on the input parameter and the environment data, wherein the output parameter includes one of an acceptable condition setting for the vehicle accessory to achieve the desired runtime and a predicted runtime for the vehicle accessory at the desired condition setting when powered by the finite power storage unit;

providing the output parameter to a display for displaying the output parameter; and

the processor controlling operation of the vehicle accessory based on the output parameter.

2. The method of claim 1 , wherein the vehicle accessory includes a heating, ventilation, air conditioning or refrigeration (HVACR) system and the finite power storage unit is an auxiliary power unit (APU).

3. The method of claim 1 , wherein the vehicle accessory includes a transport refrigeration unit.

4. The method of claim 1 , wherein receiving the environment data includes receiving weather data from a server.

5. The method of claim 4 , wherein the weather data includes a solar load forecast.

6. The method of claim 1 , wherein the finite power storage unit includes one or more batteries, and

wherein the environment data includes a state of charge of each of the one or more batteries.

7. The method of claim 6 , wherein determining the state of charge of each of the one or more batteries includes:

connecting one of the one or more batteries to a load;

measuring a current draw and a voltage drop across the one of the one or more batteries; and

determining the state of charge of the one of the one or more batteries based on the current draw and the voltage drop across the one of the one or more batteries.

8. The method of claim 6 , wherein determining the state of charge of the one or more batteries includes:

measuring a voltage of each of the one or more batteries;

engaging at least one of the one or more batteries with a load;

measuring a current draw and a voltage drop across the at least one of the one or more batteries;

disengaging the at least one of the one or more batteries from the load;

measuring an open circuit voltage of the at least one of the one or more batteries; and

determining the state of charge of the at least one of the one or more batteries based on the open circuit voltage of the at least one of the one or more batteries.

9. The method of claim 1 , further comprising:

storing the output parameter in a memory;

updating the environment data;

determining an updated output parameter using the updated environment data;

determining a deviation of the updated output parameter from a stored value of the output parameter that is stored in the memory; and

providing an alert regarding a change to the output parameter.

10. The method of claim 1 , wherein determining the output parameter includes:

entering the environment data into a model correlating vehicle accessory condition setting and runtime;

entering the input parameter into the model correlating vehicle accessory condition setting and runtime; and

determining the output parameter based on the model correlating vehicle accessory condition setting and runtime.

11. A finite power storage unit and vehicle accessory system, comprising:

a vehicle accessory;

a finite power storage unit that provides a finite amount of power to the vehicle accessory;

an input device that receives an input parameter, wherein the input parameter includes one of a desired runtime for the vehicle accessory and a desired condition setting for the vehicle accessory; and

a processor that:

receives an environment data,

determines an output parameter based on the input parameter and the environment data, and

controls operation of the vehicle accessory based on the output parameter,

wherein the output parameter includes one of an acceptable condition setting for the vehicle accessory to achieve the desired runtime and a predicted runtime for the vehicle accessory at the desired condition setting when powered by the finite power storage unit, and

wherein the processor provides the output parameter to a display for displaying the output parameter.

12. The vehicle accessory and power source system of claim 11 , further comprising a communications link for receiving environment data.

13. The vehicle accessory and power source system of claim 11 , wherein the vehicle accessory includes a heating, ventilation, air conditioning or refrigeration (HVACR) system and the finite power storage unit is an auxiliary power unit.

14. The vehicle accessory and power source system of claim 11 , wherein the vehicle accessory includes a transport refrigeration unit.

15. The vehicle accessory and power system of claim 11 , further comprising:

a memory storing a model associating a vehicle accessory condition setting with a system runtime based on the input parameter and the environment data,

wherein the processor determines the output parameter based on the input parameter, the environment data and the model.

16. A user interface for a vehicle accessory powered by a finite power storage unit, comprising:

a condition setting display showing a condition setting of the vehicle accessory;

a condition setting control allowing a user to input a desired condition setting of the vehicle accessory;

a runtime display showing a runtime of the vehicle accessory when powered by the finite power storage unit; and

a runtime control allowing the user to input a desired runtime for the vehicle accessory,

wherein, when the user inputs the desired condition setting of the vehicle accessory on the condition setting control, the runtime display is automatically updated based on the desired condition setting to display a predicted runtime of the vehicle accessory to achieve the desired condition setting of the vehicle accessory when powered by the finite power storage unit, and

wherein, when the user inputs the desired runtime of the vehicle accessory on the runtime control, the condition setting display is automatically updated based on the desired runtime to display an acceptable condition setting of the vehicle accessory to achieve the desired runtime of the vehicle accessory.

17. The user interface of claim 16 , further comprising an operating mode selection allowing selection of an operating mode for the vehicle accessory.

18. The user interface of claim 16 , further comprising:

an additional vehicle accessories display that displays a list of one or more additional vehicle accessories on the finite power storage unit; and

an additional vehicle accessories control allowing the user to input one or more desired additional vehicle accessories for operation,

wherein, when the user inputs one or more desired additional vehicle accessory accessories for operation, at least one of:

the condition setting display is automatically updated based on the inputted one or more desired additional vehicle accessories for operation and the desired runtime to display an acceptable condition setting of the vehicle accessory, and

the runtime display is automatically updated based on the inputted one or more desired additional vehicle accessories for operation and the desired condition setting to display the predicted runtime of the vehicle accessory.