If you are looking for a 125 kVA Cummins generator for a commercial building, factory, hospital, office, residential complex or other facility, the Cummins CI125D5P is one of the models worth examining.
The CI125D5P is a 125 kVA / 100 kW, three-phase, 50 Hz diesel generator set designed for prime-duty operation in India. Cummins lists it with the QSB4.5-G2 diesel engine, 415 V output, 174 A current and 1500 rpm operating speed. The model is listed for India and is part of Cummins’ CPCB IV+ generator range.
For the CI125D5P configuration covered by the Cummins specification sheet, the standard fuel tank is 275 litres, while the approximate wet weight of the enclosed generator set is 2,216 kg.
If your main questions are how much a 125 kVA Cummins generator costs, how much diesel it consumes, how large its fuel tank is, how much it weighs and what its specifications are, the detailed information below will help you evaluate the generator before requesting a quotation.
125 kVA Cummins Generator Price in India
The price of a 125 kVA Cummins generator in India is not a single fixed amount. The final quotation can vary significantly depending on the exact generator configuration, enclosure, control panel, accessories, installation requirements, transportation, taxes and supplier.
Recent online Indian listings show substantial variation. For example, one listing currently shows a 125 kVA Cummins DG set at approximately ₹7.48 lakh, while another listing shows a Cummins 125 kVA DG set at approximately ₹7.25 lakh. Other listings are considerably higher, demonstrating why an online advertised price should not automatically be treated as the final purchase price.
Therefore, a practical way to approach the 125 kVA Cummins generator price is to use online prices only as an initial reference and obtain a quotation for the exact configuration you require.
What can change the final price?
The quotation may depend on:
- Generator model and engine configuration
- CPCB IV+ compliance
- Sound-attenuated enclosure
- AMF/control panel
- ATS/changeover arrangement
- Fuel tank configuration
- Battery and battery charger
- Cabling and installation
- Exhaust arrangement
- Transportation
- Foundation and civil work
- Commissioning
- Warranty and service package
- GST and other applicable charges
Important: Prices displayed by dealers or marketplaces should not be interpreted as an official Cummins India price. Cummins’ product page provides a Request a Quote option rather than publishing a fixed retail price.
CI125D5P: 125 kVA Cummins Generator Specifications
The specific Cummins model relevant to this article is CI125D5P.
The manufacturer lists the model as a prime-duty generator with a rated output of 125 kVA / 100 kW, three-phase output, 415 V and 50 Hz frequency.
125 kVA Cummins Generator Specifications
Quick reference specifications for the Cummins CI125D5P diesel generator set. Figures are based primarily on Cummins specification documentation and product information.
| Specification | CI125D5P |
|---|---|
| Manufacturer | Cummins |
| Model | CI125D5P |
| Generator type | Diesel generator set |
| Duty | Prime |
| Prime rating | 125 kVA |
| Equivalent power | 100 kW |
| Number of phases | 3 Phase |
| Output voltage | 415 V |
| Frequency | 50 Hz |
| Power factor | 0.8 lagging |
| Rated current | 174 A |
| Speed | 1500 rpm |
| Engine | Cummins QSB4.5-G2 |
| Engine fuel | High Speed Diesel |
| Engine displacement | 4.5 litres |
| Cylinders | 4, inline |
| Cooling | Liquid cooled |
| Starting system | 24 V DC electric |
| Performance class | ISO 8528-5 G2 |
| Standard fuel tank | 275 litres |
| DEF tank | 60 litres |
| Approx. wet weight | 2,216 kg |
| Dimensions | 3500 × 1150 × 1850 mm |
| Emission certification | India CPCB IV+ |
Cummins QSB4.5-G2 Engine Used in the CI125D5P
One of the most important specifications to check when comparing generators is the engine.
The CI125D5P uses the Cummins QSB4.5-G2 diesel engine. The Cummins specification document identifies the engine as a four-cylinder, inline, liquid-cooled engine with a 4.5-litre displacement.
According to the specification sheet, the engine has:
- 4 cylinders
- Inline cylinder arrangement
- 4.5-litre displacement
- 107 mm bore
- 124 mm stroke
- 17.3:1 compression ratio
- 161.6 hp certified power
- High Speed Diesel fuel
- Turbocharged, charge-air-cooled aspiration
- 24 V DC electric starting system
- ISO 8528-5 G2 performance class
These specifications are particularly relevant when comparing the CI125D5P with other 125 kVA generator configurations.
How Many kW Is a 125 kVA Cummins Generator?
A 125 kVA generator with a power factor of 0.8 corresponds to approximately 100 kW.
The basic calculation is:
kW = kVA × Power Factor
Therefore:
125 kVA × 0.8 = 100 kW
This is why Cummins lists the CI125D5P with a prime rating of 125 kVA / 100 kW.
It is important to understand that kVA and kW are not interchangeable terms. kVA represents apparent power, while kW represents real power.
125 kVA Cummins Generator Fuel Consumption
Fuel consumption is one of the most important factors when calculating the running cost of a diesel generator.
However, there is an important point to understand before comparing figures found online.
The fuel consumption of a diesel generator changes according to the electrical load, operating conditions, engine condition, ambient conditions and configuration.
Fuel consumption is normally measured in litres per hour (L/hr), but the actual consumption of a diesel generator changes according to the electrical load and operating conditions. If you want to understand how diesel generator fuel consumption is calculated and how to estimate fuel requirements, see our detailed guide on how to calculate diesel generator fuel consumption.
Therefore, there is no single litres-per-hour figure that should automatically be applied to every operating condition.
For the CI125D5P specification sheet used for this article, Cummins describes the QSB4.5-G2 engine and its fuel system but does not provide a load-by-load litres/hour consumption table in the specification sheet.
Can a Cummins Generator Run on Dual Fuel?
Diesel consumption is an important consideration when evaluating the operating cost of a generator. For applications where reducing diesel consumption or incorporating an alternative gaseous fuel is being considered, dual-fuel technology may be another option worth evaluating.
Cummins dual-fuel solutions are designed to introduce gaseous fuel alongside diesel under appropriate operating conditions. However, compatibility, installation requirements, fuel availability and the specific generator/engine configuration should be verified before considering such a system.
Learn more about Cummins Dual Fuel Kit and how dual-fuel technology can be used with compatible diesel engines.
Why you should be careful with online fuel-consumption figures
Some online listings quote approximately 30.35 litres/hour for a 125 kVA Cummins generator. However, the listing associated with that figure identifies a 6BTAA5.9-G13 engine rather than the QSB4.5-G2 engine used in the CI125D5P discussed here.
Therefore, that figure should not be presented as the official fuel consumption of the CI125D5P.
This is an important distinction when comparing generator quotations.
How to calculate actual fuel consumption
If the supplier provides the fuel-consumption figure at your expected load, you can calculate the approximate diesel requirement using:
Diesel required = Fuel consumption per hour × Operating hours
For example, if a particular configuration is documented to consume 25 litres/hour at a specified load:
25 × 10 hours = 250 litres
The actual fuel consumption figure should always be taken from the technical documentation for the exact generator configuration being purchased.
125 kVA Cummins Generator Fuel Tank Capacity
The Cummins specification sheet gives the standard fuel tank capacity for the CI125D5P as 275 litres.
This is an important distinction because online listings for 125 kVA Cummins generators sometimes show different tank capacities.
For example, some marketplace listings show a 290-litre tank, but such listings may represent a different generator configuration.
For the CI125D5P specification covered by the Cummins document used here:
Standard fuel tank capacity = 275 litres
The same specification also identifies a 60-litre DEF tank.
How long can 275 litres of diesel run a generator?
There is no single answer because runtime depends on load and actual fuel consumption.
The basic calculation is:
Approximate runtime = Fuel tank capacity ÷ Fuel consumption per hour
For example, if a generator actually consumes 25 litres/hour under a particular operating condition:
275 ÷ 25 = 11 hours
This is only an example calculation. It should not be interpreted as the guaranteed runtime of the CI125D5P.
125 kVA Cummins Generator Weight
The approximate wet weight of the enclosed CI125D5P generator set is 2,216 kg, according to the Cummins specification sheet.
The document gives typical enclosed generator dimensions of:
- Length: 3500 mm
- Width: 1150 mm
- Height: 1850 mm
These figures are useful when planning:
- Generator room space
- Transportation
- Foundation
- Lifting arrangements
- Access routes
- Installation clearance
- Maintenance space
Because generator configurations can vary, the final dimensions and weight should be confirmed against the quotation and supplied configuration before arranging transportation or lifting equipment.
125 kVA Cummins Generator Dimensions
For the CI125D5P configuration covered by the Cummins specification sheet, the typical enclosed dimensions are approximately:
3500 mm × 1150 mm × 1850 mm
This means approximately:
3.5 metres long × 1.15 metres wide × 1.85 metres high.
When planning installation, do not use the generator’s physical dimensions alone.
You should also allow sufficient space for:
- Air intake
- Hot-air discharge
- Exhaust system
- Maintenance access
- Fuel filling
- DEF filling
- Electrical connections
- Battery access
- Servicing
- Safe operator movement
CPCB IV+ Compliance of the 125 kVA Cummins Generator
The CI125D5P is listed by Cummins as an India CPCB IV+ generator model. Cummins’ India CPCB IV+ product listing includes CI125D5P at 125 kVA / 100 kW and associates it with the QSB4.5 specification range.
This is particularly important for buyers in India because emission compliance is a major consideration when purchasing a new diesel generator.
The Cummins documentation also describes the acoustic enclosure as designed to meet stringent MoEF/CPCB requirements, including a stated 75 dBA at 1 metre at 75% load under free-field conditions.
Always verify the exact regulatory and installation requirements applicable to your project before purchasing.
Alternator and Electrical System
The generator’s alternator is another important component because it converts the mechanical energy produced by the engine into electrical energy.
The Cummins specification documentation identifies the alternator configuration for this range and provides electrical performance information for the generator set.
For the CI125D5P, the key electrical figures include:
- 125 kVA prime rating
- 100 kW
- 415 V
- 50 Hz
- 3 phase
- 0.8 lagging power factor
- 174 A
- 1500 rpm
These figures should be checked against the electrical requirements of the facility before finalising the generator size.
Cummins PowerStart Controller
The CI125D5P specification also includes the Cummins PowerStart PS0602 control system.
The controller provides generator monitoring and protection functions and is designed to provide information about important engine and alternator operating parameters. The documentation also describes functions such as remote start/stop, engine and alternator metering, protection functions and communication capabilities.
For a commercial or industrial installation, the controller is an important part of the overall generator package and should be considered when comparing quotations.
Is a 125 kVA Cummins Generator Suitable for Your Load?
A 125 kVA generator provides a nominal 100 kW at 0.8 power factor.
However, that does not mean you should simply add every electrical load in a building and select a 125 kVA generator.
Generator sizing should consider:
- Connected load
- Maximum demand
- Motor starting current
- Air-conditioning compressors
- Pumps
- Elevators
- Fire pumps
- Transformers
- UPS systems
- Harmonic-producing loads
- Future load growth
- Required starting sequence
Large motors can have substantially higher starting requirements than their normal running load.
Therefore, a proper load study is recommended before purchasing a generator.
Applications of a 125 kVA Cummins Generator
A generator in the 125 kVA class can be considered for a wide range of applications where dependable backup or prime power is required.
Potential applications include:
Commercial buildings
Offices, commercial complexes and other buildings can use generators in this capacity where the calculated backup load is within the generator’s capability.
Hospitals and healthcare facilities
Critical facilities require careful generator sizing because medical equipment, HVAC systems, pumps and other essential loads may need reliable backup power.
Manufacturing and industrial facilities
Industrial applications may involve motors, pumps, compressors and machinery that require special attention to starting characteristics.
Residential and mixed-use buildings
A properly sized generator can provide backup power to selected common services and essential building loads.
Educational institutions
Schools, colleges and training facilities may use generators to support lighting, IT equipment, security systems and other essential services.
Advantages of the CI125D5P
The CI125D5P offers several characteristics that make it worth considering in the 125 kVA class.
1. 125 kVA prime rating
The generator provides a rated prime output of 125 kVA / 100 kW.
2. Cummins QSB4.5-G2 engine
The QSB4.5-G2 is a four-cylinder, 4.5-litre diesel engine used for this generator configuration.
3. CPCB IV+ configuration
The CI125D5P is listed by Cummins as an India CPCB IV+ generator model.
4. 275-litre standard fuel tank
The manufacturer specification gives a standard 275-litre fuel tank for the configuration covered by the specification sheet.
5. Sound-attenuated enclosure
The Cummins documentation describes an acoustic enclosure designed for applicable noise and environmental requirements.
6. Cummins control system
The PowerStart controller provides monitoring and protection functions for the generator set.
What Should You Check Before Buying a 125 kVA Cummins Generator?
Do not select a generator based only on the kVA rating or advertised price.
Before purchasing, ask the supplier for the following:
- Exact model number
- Engine model
- Prime and standby rating
- CPCB compliance documentation
- Fuel-consumption data at different loads
- Fuel tank capacity
- Generator-set weight
- Generator dimensions
- Alternator make and model
- Controller model
- AMF panel details
- ATS requirements
- Battery and charger specifications
- Warranty terms
- Installation charges
- Transportation charges
- Service and maintenance arrangements
- Availability of genuine spare parts
- Commissioning procedure
- Final GST-inclusive quotation
This checklist can prevent a seemingly inexpensive quotation from becoming considerably more expensive after installation.
125 kVA Cummins Generator vs 100 kVA Generator
If your calculated requirement is close to the upper limit of a 100 kVA generator, moving to 125 kVA may provide additional capacity.
Cummins lists the CI100D5P at 100 kVA / 80 kW and the CI125D5P at 125 kVA / 100 kW within the same QSB4.5 series.
However, selecting the larger generator simply for extra capacity is not always the best approach.
A generator should operate within an appropriate load range rather than being substantially oversized for the actual requirement.
The right choice depends on your present load, starting loads and expected future demand.
125 kVA Cummins Generator Specifications PDF
If you are looking for the Cummins 125 kVA generator specifications PDF, the most useful document is the Cummins QSB4.5 Series specification sheet covering the 82.5–140 kVA range.
The document includes the CI125D5P and provides technical information such as:
- Generator rating
- Voltage
- Frequency
- Current
- RPM
- Engine model
- Engine specifications
- Dimensions
- Weight
- Fuel tank information
- DEF tank information
- Acoustic enclosure information
- Control system information
The specification document should be treated as a technical reference rather than a substitute for the final configuration supplied with a quotation. Cummins notes that specifications are subject to change.
125 kVA Cummins Generator Fuel Cost Calculation
Fuel is usually one of the largest operating expenses associated with a diesel generator.
To estimate the fuel cost, use:
Fuel cost per hour = Fuel consumption per hour × Diesel price per litre
For example, if the actual documented fuel consumption for your specific configuration and load is 25 litres/hour and diesel costs ₹90 per litre:
25 × ₹90 = ₹2,250 per hour
For 100 operating hours:
₹2,250 × 100 = ₹2,25,000
This is only an example calculation. Replace the fuel consumption and diesel price with your actual figures.
For accurate budgeting, calculate fuel consumption at the load at which the generator is expected to operate most frequently.
Frequently Asked Questions About a 125 kVA Cummins Generator
What is the price of a 125 kVA Cummins generator in India?
There is no single fixed market price. Recent online listings show prices varying considerably depending on configuration and supplier. Examples I found include approximately ₹7.25 lakh and ₹7.48 lakh, while other listings are significantly higher. Therefore, buyers should obtain a quotation for the exact CI125D5P configuration, including applicable taxes, accessories, installation and transportation.
How many kW is a 125 kVA Cummins generator?
At a 0.8 power factor, 125 kVA corresponds to 100 kW. Cummins lists the CI125D5P at 125 kVA / 100 kW prime rating.
What engine is used in the CI125D5P?
The CI125D5P uses the Cummins QSB4.5-G2 diesel engine.
What is the fuel tank capacity of the CI125D5P?
The Cummins specification sheet gives a 275-litre standard fuel tank for the CI125D5P configuration covered by the document.
What is the weight of a 125 kVA Cummins generator?
The Cummins specification gives an approximate wet weight of 2,216 kg for the enclosed CI125D5P configuration.
What are the dimensions of the CI125D5P?
The typical enclosed dimensions given in the Cummins specification are approximately 3500 × 1150 × 1850 mm.
What is the fuel consumption of a 125 kVA Cummins generator?
Fuel consumption depends on load and operating conditions. The Cummins CI125D5P specification sheet does not provide a load-wise litres-per-hour consumption table, so a specific fuel-consumption figure should be obtained from the technical documentation for the exact supplied configuration.
Is the CI125D5P CPCB IV+ compliant?
The Cummins CI125D5P is listed with India CPCB IV+ emission certification, making emission compliance an important consideration when evaluating this generator for use in India.
CPCB IV+ covers more than just exhaust-emission limits. It also includes requirements related to Type Approval, Conformity of Production (CoP), testing, emission-control systems and other compliance requirements.
For a detailed explanation of the applicable standards, testing procedures, emission limits and certification requirements, read our complete guide to CPCB IV+ emission norms for DG sets.
What voltage does the CI125D5P generate?
The Cummins specification lists 415 V, 50 Hz, three-phase output.
What is the rated current of the CI125D5P?
The specification lists the rated current as 174 A.
What is the speed of the CI125D5P?
The generator operates at 1500 rpm for its 50 Hz configuration.
Is a 125 kVA generator suitable for a factory?
It can be suitable for a factory if the calculated demand, motor-starting requirements and other electrical characteristics fall within the generator’s capability. Industrial loads should be assessed by a qualified electrical professional before selecting the generator.
Final Verdict: Is the CI125D5P a Good 125 kVA Generator?
The Cummins CI125D5P is a 125 kVA / 100 kW prime-rated diesel generator designed for the Indian market and listed by Cummins with CPCB IV+ compliance. Its QSB4.5-G2 engine, 415 V three-phase output, 1500 rpm operating speed, 275-litre standard fuel tank and approximately 2,216 kg enclosed wet weight make it a substantial generator package for commercial and industrial applications.
The most important point when comparing prices is to compare like-for-like configurations. A low advertised price may not include the same enclosure, control panel, accessories, installation, transportation, taxes or service package as another quotation.
Likewise, fuel consumption should be compared using the same engine, load condition and test basis rather than simply comparing one litres-per-hour number from different suppliers.
If your requirement is around the 125 kVA range, the CI125D5P is worth considering — but the final generator size and configuration should be based on a proper load assessment and the latest manufacturer documentation.
Technical Information and Source Note
This article has been prepared using Cummins manufacturer documentation for the CI125D5P/QSB4.5 series together with current Indian-market listings and independent market information.
Manufacturer specifications, prices, availability, configurations and regulatory requirements can change. Always verify the latest technical specification, quotation, warranty, compliance documentation and supplied configuration with Cummins or an authorised supplier before purchasing.
Disclaimer: Cummins®, CI125D5P, QSB4.5 and related product names, specifications, images and trademarks belong to their respective owners. This article is an independent informational guide and is not an official Cummins publication or endorsement. Product specifications, prices and availability may change. Manufacturer information should be verified before making a purchase decision.