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A transport refrigeration system having one or more compressors forming part of a refrigeration circuit for cooling an interior compartment of a container or refrigerated trailer; and one or more fans powered by direct current (DC) power, the one or more fans being at least one of an evaporator fan,

A transport refrigeration system having one or more compressors forming part of a refrigeration circuit for cooling an interior compartment of a container or refrigerated trailer; and one or more fans powered by direct current (DC) power, the one or more fans being at least one of an evaporator fan, a condenser fan and a ventilation fan.

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1. A transport refrigeration system comprising: one or more compressors forming part of a refrigeration circuit configured to cool an interior compartment of a container or refrigerated trailer;one or more fans configured to be powered by direct current (DC) power, the one or more fans being at leas

1. A transport refrigeration system comprising: one or more compressors forming part of a refrigeration circuit configured to cool an interior compartment of a container or refrigerated trailer;one or more fans configured to be powered by direct current (DC) power, the one or more fans being at least one of an evaporator fan, a condenser fan and a ventilation fan;a battery, the battery configured to provide DC power to the one or more fans;an auxiliary power source, the auxiliary power source configured to provide DC power to charge the battery, the auxiliary power source selected from the group consisting of an axle mounted generator and a regenerative brake mounted to the container or refrigerated trailer. 2. The transport refrigeration system of claim 1 further comprising: an engine; andan alternator operably coupled to the engine, the alternator configured to provide the DC power to the one or more fans. 3. The transport refrigeration system of claim 2 wherein: the engine directly drives the compressor through a mechanical coupling. 4. The transport refrigeration system of claim 2 further comprising: an AC or DC generator operably coupled to the engine;the AC or DC generator configured to provide AC or DC power to the compressor. 5. The transport refrigeration system of claim 1 further comprising: an engine; andan alternator operably coupled to the engine, the alternator configured to provide the DC power to the one or more fans and charge the battery. 6. The transport refrigeration system of claim 5 further comprising: a controller configured to monitor voltage at the battery, the controller configured to start the engine when the voltage at the battery drops below a threshold. 7. The transport refrigeration system of claim 1 further comprising: a DC to DC converter configured to adjust DC power from the battery and configured to provide adjusted DC power to the one or more fans. 8. The transport refrigeration system of claim 7 further comprising: an inverter configured to convert DC power from the battery to AC power;the inverter configured to provide AC power to the compressor. 9. The transport refrigeration system of claim 8 wherein: the inverter is configured to provide AC power to the one or more fans. 10. A transport refrigeration system comprising: one or more compressors forming part of a refrigeration circuit configured to cool an interior compartment of a container or refrigerated trailer;one or more fans configured to be powered by direct current (DC) power, the one or more fans being at least one of an evaporator fan, a condenser fan and a ventilation fan;a battery, the battery configured to provide DC power to the one or more fans;an auxiliary power source, the auxiliary power source configured to provide DC power to charge the battery, the auxiliary power source selected from the group consisting of an axle mounted generator and a regenerative brake mounted to the container or refrigerated trailer: a DC to DC converter for configured to adjust DC power from the battery and configured to provide adjusted DC power to the one or more fans; anda controller coupled to the DC to DC converter, the controller configured to provide a command signal to the DC to DC converter to control power to the one or more fans in response to an operational mode of the compressor. 11. The transport refrigeration system of claim 10 wherein: the controller is configured to command the DC to DC converter to reduce DC power to the one or more fans when the compressor is off. 12. A transport refrigeration system comprising: one or more compressors forming part of a refrigeration circuit configured to cool an interior compartment of a container or refrigerated trailer; one or more fans configured to be powered by direct current (DC) power, the one or more fans being at least one of an evaporator fan, a condenser fan and a ventilation fan;a battery;an auxiliary power source, the auxiliary power source configured to provide DC power to charge the battery, the auxiliary power source selected from the group consisting of an axle mounted generator and a regenerative brake mounted to the container or refrigerated trailer;an engine;an alternator operably coupled to the engine, the alternator configured to charge the battery;an AC or DC generator operably coupled to the engine;the AC or DC generator configured to provide AC or DC power to the compressor;a controller configured to monitor voltage at the battery, the controller configured to start the engine when the voltage at the battery drops below a threshold;a DC to DC converter configured to adjust DC power from the battery and configured to provide adjusted DC power to the one or more fans;the controller coupled to the DC to DC converter, the controller configured to provide a command signal to the DC to DC converter in response to an operational mode of the compressor, wherein the controller is configured to command the DC to DC converter to reduce DC power to the one or more fans when the compressor is off.