Cummins C30D6 30kW Enclosed Diesel Generator 120/240V Single Phase | Tank Options

Cummins C30D6 30kW Enclosed Diesel Generator

Protect your home, farm, business or light-commercial facility with the Cummins C30D6 30kW Enclosed Diesel Generator. This heavy-duty standby generator delivers dependable 120/240V single-phase power and is available in two factory-configured options:

• A063P964: Sound Level 1 enclosed generator without a fuel tank
• A063P963: Sound Level 1 enclosed generator with a 74-gallon basic sub-base fuel tank

Both configurations provide 30kW of standby power and 27kW of prime power. The C30D6 combines a Cummins 3.3-liter industrial diesel engine, brushless four-pole alternator, PowerCommand 1.1 electronic controls, a 150-amp main circuit breaker and a weather-protective aluminum enclosure in a complete stationary power package.

Available Configurations

A063P964 — Enclosed Generator Without Fuel Tank

Cummins part number A063P964 includes the complete C30D6 generator set with a Sound Level 1 weather-protective enclosure but does not include a diesel fuel tank.

This option is appropriate when the installation will use an existing external diesel tank, a separately selected fuel-storage system or a custom fuel arrangement designed for the required runtime and local codes.

• 30kW standby output
• 120/240V single-phase power
• Sound Level 1 aluminum enclosure
• 150-amp circuit breaker
• No integrated or sub-base fuel tank
• External fuel system required
• Approximate dimensions: 93.8 × 34 × 45.5 inches
• Approximate weight: 1,282 pounds

A063P963 — Enclosed Generator With 24-Hour Basic Tank

Cummins part number A063P963 includes the enclosed C30D6 generator mounted on a 74-gallon basic sub-base diesel fuel tank.

The tank is commonly identified as a 24-hour basic tank because its capacity supports approximately one day of operation under heavy generator loading. Published data indicates approximately 45.6 hours of runtime at 50% load. Actual runtime varies according to electrical demand, fuel level, ambient conditions and generator condition.

• 30kW standby output
• 120/240V single-phase power
• Sound Level 1 aluminum enclosure
• 150-amp circuit breaker
• 74-gallon metal sub-base diesel tank
• Approximately 24 hours of runtime under heavy loading
• Up to approximately 45.6 hours at 50% load
• Approximate dimensions: 93.8 × 34 × 60.5 inches
• Approximate weight: 1,738 pounds

30kW Standby Power for Residential and Light-Commercial Applications

The Cummins C30D6 is designed to supply dependable backup power when utility service fails. When connected to a properly selected automatic transfer switch, the generator can automatically start, accept the approved electrical load and continue operating until utility power is restored.

Its 120/240V single-phase output makes it suitable for larger homes, farms, workshops, small businesses, offices, rural properties and other facilities with single-phase electrical service.

Key Features

• 30kW emergency standby rating
• 27kW prime rating
• 120/240V single-phase output
• 60 Hz operating frequency
• 125 amps at the 30kW standby rating
• 150-amp main circuit breaker
• Cummins 3.3-liter industrial diesel engine
• 1,800 RPM engine operation
• PowerCommand 1.1 electronic control system
• Automatic remote-start and stop capability
• Flexible generator exercise scheduling
• Integrated diagnostics and fault protection
• Brushless four-pole alternator
• Less than 5% total harmonic distortion
• Sound Level 1 weather-protective enclosure
• Aluminum enclosure construction
• Approximately 69.7 dB(A) at 23 feet
• Coolant heater for improved cold-weather starting
• Available with or without a sub-base fuel tank

Cummins 3.3-Liter Diesel Engine

The C30D6 is powered by a Cummins 4BT3.3-G5 industrial diesel engine. This rugged four-cycle engine is designed for stationary power-generation applications and provides quick response when electrical loads start or change.

The liquid-cooled engine operates at 1,800 RPM and uses heavy-duty components designed to support reliable standby operation. A spin-on oil filter with a pressure-relief valve simplifies routine maintenance, while an engine-driven battery-charging alternator helps maintain the starting system during generator operation.

Engine Features

• Cummins 4BT3.3-G5 industrial diesel engine
• 3.3-liter displacement
• Four-cycle engine design
• Liquid-cooled operation
• 1,800 RPM rated speed
• Heavy-duty construction
• Fast response to changing loads
• Spin-on oil filter with pressure-relief valve
• Engine-driven battery-charging alternator
• Designed for stationary standby and approved prime applications

PowerCommand 1.1 Electronic Controls

The integrated Cummins PowerCommand 1.1 control system coordinates the engine, alternator and generator-protection functions. It supports automatic operation when connected to compatible transfer equipment and provides digital monitoring, regulation and diagnostics.

PowerCommand Features

• Automatic remote starting and stopping
• Precise voltage regulation
• Precise frequency regulation
• Generator output metering
• Engine and generator status monitoring
• Alarm and status-message display
• Automatic fault shutdown
• Integrated generator protection
• Self-diagnostic capabilities
• Two-wire remote-start control
• Flexible generator exercise scheduling
• NFPA 110 Level 1 control capability

Sound Level 1 Weather-Protective Enclosure

Both A063P964 and A063P963 include a factory-installed Sound Level 1 aluminum enclosure. The enclosure protects the generator from normal outdoor weather exposure while helping reduce operating noise.

Published sound data lists operation as low as approximately 69.7 dB(A) at 23 feet, depending on load, installation, surroundings and measurement conditions.

Enclosure Benefits

• Weather protection for outdoor installation
• Aluminum construction for corrosion resistance
• Reduced operating sound compared with an open generator
• Integrated ventilation and cooling-air pathways
• Service-access panels
• Compact factory-engineered design

Brushless Alternator Performance

The C30D6 uses a brushless four-pole alternator with automatic voltage regulation. Low-reactance 2/3-pitch windings help provide stable electrical output, dependable motor-starting performance and low waveform distortion.

Alternator Features

• Brushless four-pole design
• Drip-proof revolving field
• Low-reactance 2/3-pitch windings
• Automatic voltage regulation
• Less than 5% total harmonic distortion
• Less than 3% distortion for any single harmonic
• Short-circuit fault-clearing capability
• Direct-drive centrifugal cooling blower
• Selectable motor-starting capability

High-Ambient Cooling System

The set-mounted radiator and liquid-cooling system are designed to support operation in ambient temperatures up to 50°C or 122°F under applicable Cummins rating and derating conditions.

The installation must provide the required airflow and clearances around the enclosure. Landscaping, walls, fences, debris and other obstructions can restrict cooling air or trap hot exhaust air around the generator.

Common Applications

• Large residential homes
• Farms and rural properties
• Small businesses
• Retail locations
• Professional offices
• Workshops and equipment buildings
• Small warehouses
• Communications equipment
• Water and well systems
• Refrigeration equipment
• Light agricultural loads
• Emergency lighting and security systems
• Critical residential electrical systems
• Light-commercial standby power

What Can a 30kW Generator Power?

A properly sized 30kW generator may support a large residential electrical system or selected light-commercial loads. Potential loads may include:

• Central air-conditioning equipment
• Refrigerators and freezers
• Well and water pumps
• Lighting and receptacle circuits
• Security and communication systems
• Office electronics
• Garage or shop equipment
• Selected electric appliances
• Small commercial refrigeration
• Essential business equipment

The generator must be sized using actual electrical loads. Motor-starting current, electric heat, water heaters, pumps, air conditioners, compressors and other high-demand equipment can significantly affect generator capacity.

Fuel Consumption and Runtime

Fuel-consumption and runtime figures are approximate. Actual results vary with electrical demand, fuel level, ambient temperature, elevation, fuel quality, maintenance condition and installation.

Tank Selection Guidance

Choose A063P964 Without a Tank When:

• The property already has an approved external diesel tank
• A larger custom tank is required for extended runtime
• Local codes require a specific tank arrangement
• The installer will provide a remote fuel system
• The generator must be mounted independently of the tank

Choose A063P963 With the Basic Tank When:

• A compact generator-and-tank package is preferred
• Approximately one day of heavy-load runtime is sufficient
• Up to approximately 45.6 hours at 50% load is useful
• A factory-matched 74-gallon sub-base tank simplifies planning
• Local codes permit the basic sub-base tank configuration

Automatic Transfer Switch Not Included

An automatic transfer switch is not included with either generator option. A properly selected transfer switch is required for automatic backup of a building or electrical service.

The transfer switch must match the 120/240V single-phase service, required amperage, service-entrance arrangement, grounding method and applicable electrical codes.

Never connect the generator directly to utility-supplied wiring without approved transfer equipment.

Starting Battery Required

A properly sized starting battery is required but is not included unless specifically stated on the final sales order. Battery cables, an external battery charger and cold-weather accessories may also be required depending on the installation.

Cummins C30D6 Specifications

Variant Comparison

What Is Included With Both Options

• Cummins C30D6 diesel generator set
• Cummins 3.3-liter industrial diesel engine
• 120/240V single-phase alternator
• PowerCommand 1.1 electronic control system
• 150-amp main circuit breaker
• Sound Level 1 aluminum enclosure
• Set-mounted radiator and cooling system
• Coolant heater
• Factory generator base
• Cummins manufacturer documentation

Additional Equipment Included With A063P963

• 74-gallon basic sub-base diesel fuel tank
• Factory-matched elevated generator mounting arrangement
• Standard tank equipment associated with A063P963

What Is Not Included

• Automatic transfer switch
• Starting battery
• Battery cables or external battery charger unless listed
• Concrete generator pad or engineered foundation
• External fuel tank for A063P964
• External fuel piping and installation
• Electrical wiring and installation materials
• Permits, engineering or site preparation
• Forklift, crane or unloading services
• Startup or commissioning unless purchased separately

Professional Installation Required

The Cummins C30D6 must be installed by qualified generator, electrical, exhaust and fuel-system professionals. Installation must comply with Cummins requirements and all applicable national, state and local electrical, fire, fuel, emissions, environmental and building codes.

Site planning should address:

• Complete electrical-load analysis
• Motor-starting requirements
• Automatic transfer-switch sizing
• Foundation and structural support
• Required enclosure clearances
• Cooling-air intake and hot-air discharge
• Exhaust clearances
• Fuel storage and containment
• Tank venting and filling access
• Grounding and electrical protection
• Starting battery and battery charging
• Maintenance and service access

Freight Shipping and Delivery

This enclosed diesel generator ships by freight. The customer must provide a delivery location accessible to a full-size freight carrier and arrange equipment capable of safely unloading the selected configuration.

A properly rated forklift, crane or other lifting equipment may be required. Standard liftgate service may not be sufficient for either configuration.

Residential delivery, limited-access delivery, appointment service, storage, redelivery, reconsignment and other special freight services may result in additional charges.

Inspect the generator and packaging before signing the delivery receipt. Any visible damage, missing components or packaging concerns must be clearly documented on the carrier's delivery receipt at delivery.

Cummins Limited Warranty

The Cummins C30D6 is covered by the applicable Cummins two-year limited generator-set warranty. Extended warranty options may be available depending on the application and purchase terms.

Warranty coverage is subject to Cummins application requirements, operating-hour limits, maintenance requirements and exclusions. Product registration, authorized startup or documented maintenance may be required.

Refer to the Cummins warranty statement supplied with the generator for the complete and controlling warranty terms.

Frequently Asked Questions

What is the difference between A063P964 and A063P963?

Both are enclosed Cummins C30D6 generators with 30kW standby output and 120/240V single-phase power. A063P964 does not include a fuel tank. A063P963 includes a 74-gallon basic sub-base tank.

Are both options enclosed?

Yes. Both configurations include a Sound Level 1 weather-protective aluminum enclosure.

Is A063P964 an open generator?

No. A063P964 includes the enclosure. It is described as “no tank” because it does not include a diesel fuel tank.

Does A063P963 include a fuel tank?

Yes. It includes a 74-gallon metal sub-base diesel tank.

Why is A063P963 called a 24-hour tank?

The tank is sized to provide approximately one day of operation under heavy loading. Published specifications indicate about 26 hours at full load and approximately 45.6 hours at 50% load.

How much power does the C30D6 produce?

The generator is rated for 30kW standby and 27kW prime power.

What voltage does it produce?

These configurations produce 120/240V single-phase, 60 Hz power.

How many amps does it produce?

The 30kW rating corresponds to approximately 125 amps at 240V single phase.

What size circuit breaker is included?

Both configurations are listed with a 150-amp main circuit breaker.

What engine is used?

The C30D6 uses a Cummins 4BT3.3-G5 3.3-liter industrial diesel engine operating at 1,800 RPM.

Is an automatic transfer switch included?

No. A compatible transfer switch must be purchased separately.

Is a starting battery included?

No. A properly sized starting battery is required but not included unless specifically listed on the sales order.

Can the generator be installed outdoors?

Yes. Both options include a weather-protective enclosure, but all Cummins clearance, foundation, airflow and exhaust requirements must be followed.

How loud is the C30D6?

Published specifications list approximately 69.7 dB(A) at 23 feet. Actual sound varies with load, surroundings and installation.

Can it power an entire home?

It may power a large portion or all of some homes, but suitability depends on the actual load, air-conditioning equipment, electric heat, water heating, pumps and motor-starting requirements.

Can it be used for a business?

Yes. It is designed for residential and light-commercial applications, provided the generator is properly sized for the connected loads.

Can A063P964 be connected to a large external tank?

Yes, provided the fuel system is professionally designed and complies with Cummins requirements and applicable codes.

Can the tank on A063P963 provide more than 24 hours?

Yes. At approximately 50% load, published data indicates about 45.6 hours of runtime. Runtime decreases as electrical load increases.

Is the tank double-wall?

The configuration is identified as a basic 74-gallon sub-base tank. Confirm tank construction, containment, alarms and local-code compliance from the order-specific Cummins tank submittal before purchasing.

Does the generator have clean power for electronics?

The alternator is listed with less than 5% total harmonic distortion under linear loads, making it suitable for many common electronic loads when properly installed.

Is professional installation required?

Yes. Professional generator, electrical, exhaust and fuel-system installation is required.

Which option should I choose?

Choose A063P964 when using an external or custom fuel system. Choose A063P963 when a compact factory-matched generator and 74-gallon sub-base tank package is preferred.

Important Ordering Information

Before ordering, confirm:

• Cummins model C30D6
• 30kW standby output
• 120/240V single-phase configuration
• 150-amp circuit breaker
• A063P964 without a fuel tank or A063P963 with a 74-gallon basic tank
• Sound Level 1 enclosure
• Required automatic transfer switch
• Starting-battery requirements
• Local fuel-tank and emissions requirements
• Current production lead time
• Final factory-installed options
• Freight and unloading requirements
• Cancellation and return restrictions

Manufacturer: Cummins Power Generation
Model: C30D6
Standby Rating: 30kW
Prime Rating: 27kW
Voltage: 120/240V
Phase: Single phase
Frequency: 60 Hz
Fuel: Diesel
Enclosure: Sound Level 1 aluminum enclosure
No-Tank Option: A063P964
24-Hour Basic-Tank Option: A063P963

Specifications, availability and included factory equipment are subject to change. Product images may display optional equipment or representative configurations. The final Cummins order acknowledgment and order-specific submittal documents determine the exact equipment supplied.