Choosing a solar EPC company is an important decision for any business in Chennai.
Whether you run a manufacturing unit in Sriperumbudur, a warehouse in Oragadam, a commercial building in Ambattur, or an industrial facility elsewhere in Tamil Nadu, installing solar is a long-term investment. The quality of the engineering, equipment, installation and after-sales support can influence the system’s performance for many years.
Many businesses make the mistake of comparing solar EPC companies mainly on the price per kW.
Price matters, but it should not be the only factor.
A lower quotation may not always represent a lower total cost over the life of the project. Differences in panel quality, inverter selection, system design, installation practices, warranties, monitoring and maintenance can have a significant impact on the actual value of the project.
Before signing a solar EPC contract, Chennai businesses should ask detailed questions and make sure the answers are clearly documented.
Here are five important questions to ask.
1. What Exactly Is Included in Your Solar EPC Proposal?
The first question should be simple:
“What exactly am I getting for the quoted price?”
EPC stands for Engineering, Procurement and Construction. In a solar project, an EPC company is generally responsible for designing the system, procuring the required equipment and carrying out installation and commissioning.
However, the scope can vary considerably between companies.
One quotation might include almost everything required for a complete installation, while another may exclude certain civil, electrical, approval or commissioning costs.
Ask the EPC company to clearly specify:
- Solar module make and model
- Inverter make and model
- Mounting structure specifications
- DC and AC cables
- DCDB and ACDB
- Earthing system
- Lightning protection
- Monitoring system
- Installation and commissioning
- Civil works
- Electrical works
- Testing and inspection
- Metering-related work
- Grid-connection requirements
- Applicable approvals
- Transportation
- Insurance during installation
- Operations and maintenance
This is especially important for industrial projects.
A factory may have complex electrical infrastructure, multiple distribution panels, transformers and high-capacity equipment. The solar plant needs to be properly integrated into that existing electrical system.
Don’t compare only the final price
Suppose Company A quotes ₹X per kW and Company B quotes ₹X + 8%.
At first glance, Company A appears cheaper.
But if Company B includes better equipment, monitoring, stronger mounting structures, more comprehensive commissioning and a longer maintenance package, the difference may not be as large as it initially appears.
Compare the complete scope, not just the quotation total.
2. How Did You Calculate the Expected Solar Generation?
The second question is perhaps the most important:
“How much electricity do you realistically expect this system to generate?”
A professional EPC company should be able to explain the assumptions behind its generation estimate.
For example, a proposal may state:
Installed capacity: 500 kW
and
Expected annual generation: X lakh units
But the important question is:
How was that number calculated?
Solar generation depends on several factors, including:
- Location
- Solar irradiation
- Panel orientation
- Panel tilt
- Shading
- Module efficiency
- Inverter efficiency
- Temperature
- System losses
- Cable losses
- Soiling
- Equipment availability
- Weather conditions
- System degradation
For Chennai and Tamil Nadu businesses, the local climate and site conditions should be incorporated into the assessment.
Ask for a Generation Model
Before signing, ask the EPC company to provide a detailed generation estimate.
Ideally, the proposal should explain:
- Expected monthly generation
- Annual generation
- Specific yield
- Performance assumptions
- System losses
- Degradation assumptions
- Estimated performance ratio
- Shading analysis
A monthly generation estimate is particularly useful.
Why?
Because solar production is not identical every month.
Weather, rainfall and seasonal conditions can affect generation.
If the EPC company provides only one large annual number without explaining the assumptions, ask for more detail.
3. Which Solar Panels, Inverters and Other Components Will You Use?
Solar panels are highly visible, but they are only one part of the system.
The inverter, mounting structure, cables, protection equipment and monitoring system also matter.
Before signing the contract, ask:
“Which exact equipment models will be installed?”
Do not settle for a proposal that simply says:
Tier-1 solar panels
or
Premium inverter
Those descriptions are not specific enough.
Ask for the actual:
- Manufacturer
- Model number
- Rated capacity
- Datasheet
- Warranty
- Certification
- Technical specifications
Solar Modules
Important module specifications can include:
- Rated power
- Module efficiency
- Temperature coefficient
- Product warranty
- Performance warranty
- Degradation rate
- Applicable certifications
The EPC company should also explain whether the proposed modules are suitable for the site’s environmental conditions.
Inverters
The inverter converts the DC electricity produced by the solar modules into AC electricity that can be used by the facility.
Ask about:
- Inverter efficiency
- Operating temperature
- Protection features
- Monitoring
- Warranty
- Service availability
- Replacement procedure
For a commercial or industrial project, inverter downtime can affect generation, so service support matters.
Mounting Structures
The mounting structure is another component that should not be overlooked.
For rooftop projects, ask:
- What material is being used?
- What corrosion protection is provided?
- How will the structure be attached?
- Will roof waterproofing be affected?
- How will wind loads be handled?
- Who is responsible for structural assessment?
For Chennai’s coastal environment, corrosion resistance deserves particular attention in suitable locations.
4. What Happens After the Solar Plant Is Installed?
A solar EPC relationship should not end when the installation is completed.
Solar systems require ongoing monitoring and maintenance.
Therefore, ask:
“What after-sales support do you provide?”
This question can separate a complete solar solution from a basic installation contract.
Ask whether the EPC company provides:
- Preventive maintenance
- Module cleaning
- Inverter inspection
- Electrical testing
- Remote monitoring
- Fault alerts
- Performance reports
- Breakdown support
- Replacement coordination
- Annual maintenance contracts
Ask About Response Time
Don’t just ask whether maintenance is available.
Ask:
“If the inverter stops working, how quickly will your service team respond?”
For a commercial or industrial facility, downtime can have a financial impact.
It is useful to have service commitments clearly documented in the agreement.
For example, the contract can define:
- Response time
- Inspection timeline
- Repair timeline
- Escalation process
- Replacement responsibilities
The exact service terms should be agreed upon based on the project and documented rather than relying on verbal promises.
5. What Does the Contract Say About Performance, Warranty and Exit Conditions?
Before signing, carefully review the contract itself.
A good sales presentation is not a substitute for clear contractual terms.
Ask:
“What happens if the system does not perform as expected?”
This does not necessarily mean that the EPC company should guarantee a specific amount of electricity under every circumstance.
Solar generation naturally varies with weather and operating conditions.
Instead, you should understand exactly what the company guarantees and what it does not.
Review the Different Warranties
There may be several different warranties associated with a solar project.
Module warranty
This may cover product defects and long-term performance according to the manufacturer’s terms.
Inverter warranty
This covers the inverter for the specified warranty period and conditions.
Workmanship warranty
This relates to the quality of installation work performed by the EPC company.
Structure warranty
This may cover specified structural components or defects.
These warranties are not interchangeable.
Ask:
Who provides each warranty?
And:
Who should I contact if there is a problem?
That distinction can save considerable confusion later.
Don’t Ignore the Fine Print
Before signing a solar EPC agreement, review:
- Payment schedule
- Project completion timeline
- Equipment specifications
- Warranty conditions
- Performance commitments
- Maintenance responsibilities
- Insurance
- Damage responsibility
- Delay provisions
- Change-order procedures
- Site-access requirements
- Grid-connection responsibilities
- Termination conditions
- Dispute-resolution provisions
For a significant industrial investment, businesses may also want their legal and financial teams to review the agreement.
Bonus Question: Who Will Handle Approvals and Grid Connection?
For many Chennai businesses, this deserves to be a separate question.
Ask:
“Which approvals and utility-related activities are included in your scope?”
Depending on the project structure, there may be requirements involving:
- Electrical inspections
- Metering
- Interconnection
- Utility documentation
- Safety requirements
- Applicable approvals
The exact process can depend on the project type, consumer category and prevailing regulations.
Do not assume that everything is automatically included just because the proposal says “complete EPC.”
Ask the company to put its responsibilities in writing.
Rooftop Solar vs Ground-Mounted Solar: Ask Different Questions
The five questions above apply broadly, but the technical concerns can change depending on the project.
For rooftop solar
Pay particular attention to:
- Roof condition
- Structural assessment
- Waterproofing
- Roof warranty
- Access for maintenance
- Mounting method
- Wind loading
- Corrosion protection
- Future roof replacement
For ground-mounted solar
Pay more attention to:
- Land conditions
- Foundation design
- Drainage
- Site security
- Soil conditions
- Module cleaning
- Vegetation management
- Cable routing
- Site access
For an industrial customer, these details can have a major impact on long-term maintenance.
How Chennai Factories Should Compare Solar EPC Companies
Instead of creating a shortlist based only on price, create a simple comparison sheet.
| Factor | EPC Company A | EPC Company B | EPC Company C |
|---|---|---|---|
| System capacity | |||
| Solar module | |||
| Inverter | |||
| Expected annual generation | |||
| Performance assumptions | |||
| Monitoring | |||
| O&M period | |||
| Workmanship warranty | |||
| Equipment warranties | |||
| Installation timeline | |||
| Grid-related scope | |||
| Total project cost | |||
| Payment terms | |||
| Service response |
This makes it easier to identify differences that may be hidden in lengthy quotations.
The Cheapest Solar EPC Quote May Not Be the Cheapest Project
This is an important point for business owners.
Imagine two EPC proposals.
Proposal A
Lower initial price but:
- Basic equipment
- Limited monitoring
- Shorter service coverage
- Fewer included services
Proposal B
Slightly higher initial price but:
- Better-specified equipment
- Detailed engineering
- Stronger monitoring
- Comprehensive commissioning
- Longer support
- Better documentation
The cheaper proposal may still be appropriate in some circumstances.
But the comparison should be based on the total project value, not just the initial quotation.
A solar plant is expected to operate for many years.
A small difference in upfront cost can be less important than reliable generation, good engineering and responsive service over the operating life.
Why Site Assessment Matters Before Signing
A professional EPC company should understand the actual site before finalising the system design.
For a Chennai industrial facility, the site assessment may include:
- Roof measurements
- Shading analysis
- Structural evaluation
- Electrical infrastructure
- Transformer capacity
- Existing load
- Cable routes
- Inverter location
- Maintenance access
- Safety requirements
A quotation prepared without properly understanding the site should be treated carefully.
The better approach is:
Site survey → Load analysis → System design → Generation estimate → Financial analysis → Final quotation → Contract
rather than:
Quotation → Installation → Questions later
What Should a Good Solar EPC Proposal Include?
A well-prepared proposal should make it reasonably easy for the customer to understand the project.
Look for:
Technical information
- System capacity
- Module specifications
- Inverter specifications
- Structure details
- Electrical design
- Monitoring
Energy information
- Expected monthly generation
- Expected annual generation
- Performance assumptions
- Degradation assumptions
Commercial information
- Total project cost
- Taxes
- Payment schedule
- Financing, if applicable
- O&M costs
Project information
- Installation timeline
- Commissioning process
- Responsibilities of both parties
- Warranty details
- Service terms
If important information is missing, ask for it before signing.
Why Kinetiq Energy Can Be a Useful Partner for Chennai Businesses
For Chennai and Tamil Nadu businesses, choosing solar should be about more than installing panels.
The project needs to fit the customer’s electricity consumption, facility, operating schedule and long-term energy objectives.
Kinetiq Energy provides solar EPC and renewable energy solutions for businesses looking to evaluate and implement solar power as part of their energy strategy.
The company can help customers consider factors such as:
- Site suitability
- Solar system sizing
- Electricity consumption
- Solar generation potential
- Equipment selection
- Engineering and installation
- Monitoring
- Maintenance
- Long-term energy planning
You can learn more about Kinetiq Energy and its solar solutions at kinetiqenergy.com.