Solar Customer Onboarding Flow

The deal is signed. The payment cheque is in your hand. Now what?

For most solar EPC owners, the answer to that question is: we figure it out. The site survey team gets called. WhatsApp messages get sent. Someone starts looking at panel availability. The installation gets scheduled somewhere between now and next month. And the customer, who just committed ₹2–5 lakh to your business, is left waiting, guessing, and occasionally sending messages asking "kab hoga?"

That is not a customer onboarding flow. It is organised chaos. And at 10 installations per month it is manageable. At 25 or 30, it breaks. Projects get delayed. Customers feel ignored. The referral that should have come from this installation never materialises. And Rohit, who is trying to scale his EPC business from 15 to 40 installations per month, finds himself personally firefighting three simultaneous customer escalations every week.

This guide maps the complete solar customer onboarding flow in India, all 10 stages from signed agreement to commissioned system, with timeline benchmarks for residential and commercial projects, the communication touchpoints that prevent customer anxiety, and exactly how QuickEstimate tracks pipeline stages so nothing slips through.

Research draws on MNRE's rooftop solar deployment guidelines{target="_blank" rel="noopener"}, field data from the PM Surya Ghar national portal{target="_blank" rel="noopener"}, the Central Electricity Authority's grid connectivity standards{target="_blank" rel="noopener"}, CEEW's solar EPC market research{target="_blank" rel="noopener"}, and project cycle data from EPCs in the QuickEstimate network.

Why a Documented Onboarding Flow Changes Your Business

Before mapping the stages, let us establish why formalising this process matters enough to spend 12 minutes on.

The average residential solar installation in India involves 12–18 distinct hand-offs between departments, vendors, government offices, and the customer. Every unmanaged hand-off is a place where a project can sit idle for 3–10 days while someone waits for someone else to take action. A typical EPC with no formal onboarding process loses an average of 15–20 days per project to inter-stage wait time, delays that are entirely preventable and entirely invisible to any team member not specifically looking for them.

Beyond the efficiency argument, a documented onboarding flow directly supports your solar sales funnel in India, because repeat customers and referrals are generated primarily by how you handle the post-sale experience, not by how well you sold in the first place.

The 10-Stage Solar Customer Onboarding Flow

1. 1
   Payment Collection and Receipt

   Target completion: Day 0–1 | Owner: Sales team

   Collect the initial advance payment (typically 30–40% of project value) and issue a formal receipt and work order immediately. This step is often informally handled, verbal confirmations, unacknowledged bank transfers, which creates downstream problems with payment dispute resolution and subsidy documentation. Issue a formal work order PDF via WhatsApp within 24 hours of payment receipt. This sets the professional tone for the entire project and establishes that your company has a process. For PM Surya Ghar projects, this is also when you initiate consumer registration on the national portal if not already done at the quotation stage.

2. 2
   Site Survey and Load Calculation

   Target completion: Day 1–3 | Owner: Technical team

   Schedule the site survey within 24 hours of payment receipt, not after some unspecified "when the team is free." The survey should cover: rooftop area measurement and tilt angle, shading analysis (morning and afternoon), load analysis (last 12 months' electricity bills), existing wiring condition and earthing status, roof material and load-bearing capacity, and proposed cable routing. The [solar site survey checklist](/blog/solar-site-survey-checklist) gives you the complete 40-point framework. The output of this stage is a signed survey report and the final system sizing confirmation. Any change from the quoted system size should be agreed in writing before proceeding to design.

3. 3
   Design and Drawing Approval

   Target completion: Day 3–6 | Owner: Design team

   Based on the site survey, the design team prepares the single-line electrical diagram, the layout drawing showing panel placement on the roof, the earthing scheme, and the cable schedule. For systems above 10 kW, also prepare the protection relay scheme for DISCOM submission. Send the customer a visual layout of their roof, where the panels go, where the inverter is positioned, where cables run. Customers who see this diagram before installation have fewer complaints during installation ("why is the inverter there?") and report higher satisfaction. The approved drawing also becomes the as-built document at commissioning, saving rework. Get written approval (even a WhatsApp "approved" message) before proceeding to procurement.

4. 4
   Material Procurement and Delivery

   Target completion: Day 4–10 | Owner: Procurement team

   Place material orders the same day as design approval, waiting until the day before installation is the single most avoidable source of delay in residential projects. For standard 3–5 kW residential systems using ALMM-listed panels and inverters from your regular suppliers, material lead time is typically 2–4 days. For commercial systems above 50 kW with custom mounting structures, 7–14 days is realistic. Procure only MNRE ALMM-listed panels and inverters, this is not just a subsidy requirement, it is the single most common cause of DISCOM application rejection and commissioning delays. Verify ALMM status before every order, not just at the quotation stage, because the list is updated quarterly. Confirm delivery to site at least 24 hours before the scheduled installation date.

5. 5
   Installation Scheduling

   Target completion: Day 6–9 | Owner: Operations team

   Confirm the installation date with the customer at least 3 days in advance, not the night before. Provide: the names and mobile numbers of the installation crew leader, the expected arrival time, the expected duration (typically 1.5–2 days for residential, 3–7 days for commercial), and what the customer needs to have ready (roof access, power supply for tools, someone present at home on Day 1). Send a WhatsApp confirmation message with these details. Customers who receive this information are significantly more likely to be available for the installation crew and significantly less likely to call with "where is your team?" during installation day. Your installation scheduling also needs to account for the EIC application process, if you are in Maharashtra or Karnataka, file the EIC application before or on the same day as installation start, not after completion.

6. 6
   Installation Execution

   Target completion: Day 9–13 (residential), Day 15–25 (commercial) | Owner: Installation crew

   Execute installation in sequence: mounting structure first, panels, DC wiring, inverter, AC wiring to DB, earthing, and cable tray/conduit finishing. Photograph every stage, mounting structure before panels go on, inverter installed and labelled, earthing electrode and wire connections, completed cable routing, junction box connections with wire labels. These photographs serve three purposes: proof of work quality for the customer, documentation for the DISCOM net metering application (minimum 8 site photos required), and protection against any future disputes about what was installed and how. Do not skip the labelling, DISCOM JE inspectors specifically check that all DC and AC isolators are labelled, and unlabelled systems are the second most common reason for inspection failure. Have the customer sign a daily progress acknowledgement so there is no dispute about timeline.

7. 7
   Quality Inspection

   Target completion: Day 13–15 | Owner: QC lead or senior engineer

   Before applying for any DISCOM or Electrical Inspector approval, run your own internal quality check. The QC checklist should include: DC voltage and current measurements at each string (compare against expected values from panel specs), inverter startup verification and first generation confirmation, earthing resistance test (target below 5 ohms, ideally below 1 ohm for residential), torque check on all mounting hardware, cable insulation resistance test, anti-islanding function test (where applicable), and visual check of all labels and cable management. A system that passes your internal QC will pass the DISCOM JE inspection. A system that has not been internally QC'd has a 35% chance of JE re-inspection, which adds 15–20 days to your commissioning timeline. This is also the moment to collect the second payment milestone, typically charged at "installation complete, before commissioning."

8. 8
   Commissioning and Net Metering

   Target completion: Day 15–40 (residential) | Owner: Commissioning engineer + DISCOM

   This is the longest and least controllable stage, the complete seven-step commissioning process is detailed in the [solar commissioning process guide](/blog/solar-commissioning-process). The key operational point here is that this stage must be entered into your pipeline with its own sub-stages and expected durations by state. Do not put "commissioning" as a single pipeline stage, break it into EIC submitted, DISCOM inspection cleared, net meter installed, and system energised. Each is a separate milestone with a separate responsible person and a separate expected completion date. The [net metering application timeline](/blog/net-metering-application-timeline) gives state-by-state benchmarks. The [PM Surya Ghar application process](/blog/pm-surya-ghar-application-process) covers the additional steps for scheme-eligible projects.

9. 9
   Customer Training and Handover

   Target completion: Day of energisation | Owner: Project lead

   The handover meeting should happen on the same day as or the day after system energisation. Do not mail documents and consider the project closed. Show up in person, or send your most senior field person. Walk the customer through: how to read the bidirectional net meter, how to read the inverter monitoring app, what the monthly generation numbers will look like in each season, what a fault code means and what to do (first call you), how to verify billing is correct on their next electricity bill, and when their PM Surya Ghar subsidy credit is expected. Issue all original documents: DISCOM commissioning certificate, equipment warranty cards, as-built drawing, operating guide. This handover visit is also Stage 10 setup, it is the prime moment to convert the customer to an AMC.

10. 10
    AMC Pitch at Handover

    Target completion: Day of handover | Owner: Sales lead + Project lead

    The handover visit is your highest-conversion moment for AMC sales, the customer is emotionally engaged, the system is live, and the value of keeping it running well is tangible in a way it was not during the sales conversation. Present the AMC as the natural completion of the project, not as an upsell. "Now that your system is live, let us talk about how we keep it performing at its best." Cover what the AMC includes (panel cleaning, inverter health check, generation monitoring, priority fault response), the pricing (₹2,000–2,500/kW/year for residential), and the consequence of not having it (15–30% generation loss from uncleaned panels within 12 months). The complete AMC structure and pitch framework is in the [solar after-sales service guide](/blog/solar-after-sales-service). If the customer does not sign at handover, have a 7-day follow-up call in your CRM calendar, the [solar sales follow-up rules](/blog/solar-sales-followup-rules) apply here exactly as they do to new leads. Customers who are not followed up within 7 days of handover convert to AMC at less than half the rate of those who receive a timely follow-up.

Timeline Benchmarks: Residential vs Commercial

Residential vs Commercial: Key Onboarding Differences

The 10 stages are the same, but the operational reality of commercial projects differs enough from residential to require a separate playbook for each.

Communication Touchpoints: What to Send and When

Most customer anxiety during a solar project comes from silence, not from actual problems. A customer who receives a WhatsApp update at every major milestone feels informed and in control. A customer who receives no updates between payment and installation start begins to wonder if you are still in business.

Fourteen communication points across a 25-day project is not excessive, it is one touchpoint every 1.8 days, and each one replaces an anxious "kab hoga?" call that would have consumed 10 minutes of your team's time anyway. The solar sales follow-up rules principle, that consistent, structured follow-up always outperforms reactive follow-up, applies to post-sale communication exactly as it does to lead follow-up.

How to Reduce Project Cycle Time

How QuickEstimate Tracks the Onboarding Pipeline

For a scaling EPC like Rohit, the challenge is not knowing what the 10 stages are, it is having visibility across 25 simultaneous projects at different stages, each with different team members responsible, each in a different state with different timelines.

QuickEstimate is built for exactly this operational context. Here is how it maps to the onboarding flow:

• Custom pipeline stages that map to all 10 onboarding steps, not generic "new / in-progress / closed"
• Age indicators that flag projects sitting in any stage longer than the expected duration
• Assigned owners for each stage so hand-offs are tracked and visible to the whole team
• Document attachment at each stage, EIC, survey report, DISCOM reference numbers, payment receipts all attached to the project record
• Reminder automation for follow-up tasks, "follow up with DISCOM metering department" triggered automatically after JE clearance plus 5 days
• Payment milestone tracking, advance, installation, commissioning milestones all tracked against the project
• State-specific timeline templates, Gujarat projects get Gujarat benchmarks; Maharashtra projects get Maharashtra benchmarks

The result is that your entire post-sale operational workflow, from payment to handover, lives in one place that everyone on your team can see. No project disappears into a WhatsApp thread. No DISCOM follow-up gets forgotten. No handover gets missed.

This is what separates a 15-project-per-month operation from a 40-project-per-month operation with the same team size. Not working harder, working with better visibility. If you are evaluating whether you need a dedicated solar CRM, the guide to when to buy a solar CRM gives you a clear decision framework based on your current project volume and team size.

Frequently Asked Questions