Solar Proposal Best Practices

A good solar proposal looks different from a careless one. Not flashier, cleaner. Every number is correct, the subsidy is shown, the customer's name is spelled right, and there is exactly one place to say yes. A careless proposal looks like it was built by copying last month's PDF and changing a few cells.

The gap between a careless proposal and a good one is not creativity or design budget, it is a checklist. This post lays out the Proposal Quality Checklist, so you can apply the same discipline to every proposal your team sends. For a broader view of where teams lose deals across the wider software stack, see this rundown of recurring mistakes in proposal software workflows.

The Proposal Quality Checklist, The Named Framework

The Proposal Quality Checklist is a 12-item gate that every proposal must pass before it is sent to a customer. Run it mentally (solo installers) or use it as a manager-approval step (larger teams). It should take only a few minutes. Missing even one item can cost a deal. Before building your own checklist, it helps to study the most common solar proposal mistakes to avoid, since most checklist failures trace back to the same handful of recurring errors.

Best Practice 1, Branding: Look Like You Mean Business

The fastest way to differentiate your proposal from a competitor's is branding. Most small EPCs send proposals in black-and-white Word documents with no logo. A PDF with your logo, brand colours, and a clean layout signals professionalism before the customer reads a single number. For layout, colour, and typography choices that hold up on a phone screen, see a branded proposal design guide.

What to standardise:

• Logo in the top-left of every page
• Consistent font (one sans-serif like Inter or Poppins throughout)
• Brand colour for headings and table headers
• Footer with your company name, GSTIN, and phone number on every page

Best Practice 2, Subsidy Accuracy: The Trust Builder

Subsidy calculation errors are an easy way to lose a customer's trust after the purchase. A customer sees "₹78,000 subsidy" in the proposal, then finds the actual amount is lower because the system did not qualify or the vendor miscalculated the slab.

The PM Surya Ghar subsidy structure is tiered, not linear. The first 2 kW attracts ₹30,000/kW; the next 1 kW (up to 3 kW) attracts ₹18,000/kW; anything above 3 kW receives the same ₹78,000 cap (MNRE's CFA guidelines, July 2025 version).

Common subsidy errors to avoid:

See the detailed guide at how to calculate PM Surya Ghar subsidy and the latest 2026 subsidy slabs.

Best Practice 3, ROI Math That Uses Their Numbers

Generic ROI claims destroy credibility. "You will save ₹2,500/month" means nothing unless you tie it back to the customer's actual bill. The formula is simple:

Monthly saving = (system generation kWh × % self-consumed × tariff per kWh) + (% exported × net metering rate)

Illustrative example, with assumed figures, for a customer with a ₹3,500/month bill in Maharashtra:

• 3 kW system generates ~375 kWh/month
• Self-consumed 80% = 300 kWh × ₹8/kWh = ₹2,400
• Exported 20% = 75 kWh × ₹3.8/kWh = ₹285
• Total monthly benefit: ₹2,685
• Reduction from ₹3,500 bill: 77%

That is a statement that closes deals. "Based on your current bill of ₹3,500, you will save approximately ₹2,685 per month, reducing it to ₹815."

Best Practice 4, Mobile-First Formatting

Your customer will almost certainly open the proposal on a phone. This means:

• Font size: minimum 11pt for body text
• Table columns: max 3 columns; wider tables should scroll horizontally with a note
• Images: use high-contrast visuals; avoid pale watermarks
• Page size: A4 PDF renders better on phones than custom sizes

Test every proposal by opening it on your own Android phone before sending. If you cannot read it without zooming, the customer cannot either. For more field-tested guidance on this, see these practical solar proposal presentation tips.

Best Practice 5, WhatsApp-Friendly Delivery Message

The PDF is only half the proposal. The WhatsApp message that delivers it is the other half. Many EPCs send the PDF with "Please find attached", which is copied from email etiquette and reads as cold and corporate.

Better message template:

"Hi Rajesh bhai, here is your solar proposal for 3 kW at your Surat home. Your saving: ~₹2,400/month. Subsidy: ₹78,000. Net cost: ₹[amount]. Let me know when you want to book the site visit, I can come any evening this week."

This message includes the three key numbers, personalises with their name, and proposes a next step.

More on this workflow is covered in our guide on WhatsApp solar proposals and follow-up automation in India.

Best Practice 6, Keep Reading Time Under 2 Minutes

Customers make buying decisions about solar in the family group, late at night, on a phone. If the proposal takes 10 minutes to read, it will not get read at all.

Word count guideline:

• Total body text: 350–500 words
• Each section heading should be self-explanatory so a skim-reader gets the picture
• Use tables and bullet points for dense information, not paragraphs

Best Practice 7, Include a Nearby Reference

One of the most powerful closing tools in a proposal is a single sentence: "We installed a 3 kW system for your neighbour, Mr. Mehta on Ring Road, in March 2025. You are welcome to contact him." (An example, use only a real customer who has agreed.) A verifiable nearby reference can persuade sceptical customers more than any technical claim.

Ask every satisfied customer for permission to use them as a reference. Build a bank of 20–30 reference customers organised by city and system size. Insert the closest one into every proposal. For a bigger buyer, back the reference with a written one-pager, using our solar case study template.

Best Practice 8, Show the Payback Period as a Timeline

"Your payback period is 4.2 years" is abstract. "From month 1 to month 50, your EMI is ₹2,100/month. From month 51 onwards, you pay nothing to the bank and your electricity bill stays much lower" is concrete.

Frame the payback as a story with two phases:

1. EMI phase: months 1–50 (or whatever the actual EMI period is), as detailed in presenting EMI options in a solar proposal
2. Low-bill phase: month 51 onwards, with the system still generating (panel warranties commonly run about 25 years, check yours)

This reframes the decision from "can I afford ₹1.2 lakh" to "do I want to cut my electricity bill for many years."

Best Practice 9, One Clear CTA at the End

Every proposal should end with exactly one call to action. Not a list of options, not a polite "feel free to reach out." One specific action with a simple way to take it.

Good options:

• "Reply YES to this WhatsApp to confirm your site survey"
• "Call us at XXXXX, we will schedule installation within 7 days of confirmation"
• "Sign the last page and photograph it to proceed"

The goal is to make the next step so small that saying yes requires almost no effort.

Key Numbers to Check in Every Proposal

Best Practice 10, Keep GST Transparent

Solar installations involve two different GST treatments. Solar goods and systems attract 5% GST from 22 September 2025 (it was 12% before; PIB and CBIC Notification 9/2025-IGST(Rate)), and an EPC contract is deemed 70% goods and 30% service. The service portion is under entry 38 of Notification 11/2017-CT(Rate), at 9% CGST plus 9% SGST, or 18% IGST on an inter-State supply. Many EPCs bundle these into a single price, which creates confusion and suspicion.

Show the GST clearly and explain it. For an inter-State supply the blended effective rate is 8.9% (0.7 × 5% + 0.3 × 18%), so you could write: "GST blended at 8.9% (5% on 70% of the contract value as goods, 18% on 30% as installation service)." Confirm the treatment for your contract with your CA. Customers who understand the breakdown are less likely to negotiate on tax grounds. For a broader rundown of the line items to verify before quoting, see a solar quotation checklist for line-item accuracy.

Best Practice 11, Validate Before Sending

Run a 60-second visual check before sending any proposal:

1. Open on your phone, does it look right?
2. Is the customer name correct?
3. Is the subsidy amount correct for this system size?
4. Is today's date on the cover?
5. Is the CTA clear and singular?

Five checks, 60 seconds. It prevents the most common errors.

Best Practice 12, Follow Up With a Plan

A proposal without a follow-up plan is a lottery ticket. Most customers do not respond immediately, not because they are not interested, but because they need time to discuss with family or compare quotes.

A good habit is to attach a follow-up schedule to every proposal the moment it is sent:

• Day 3: WhatsApp check-in with ROI highlight
• Day 7: Share a case study or photo of a nearby installation
• Day 14: Mention a financing option or limited-time offer

See the complete sequence in our solar proposal follow-up cadence guide.

Proposals vs No System: The Cost of Not Improving

How Quickest Solar CRM fits

Quickest Solar CRM helps you run the Proposal Quality Checklist: reps build every proposal from the same template, so the logo, items, terms and subsidy treatment are consistent. The app does not check the customer name or CTA for you, so keep the checklist next to the keyboard.

• The Proposal Generator applies the PM Surya Ghar subsidy in the proposal (still check it against the current MNRE slab)
• Your logo, items, product photos and terms are set once in the proposal template, so every proposal looks the same
• With WhatsApp follow-up you share the PDF on WhatsApp with a saved message template and set a follow-up reminder on the lead
• The Quotation System keeps standard line items in the admin-set price list with margin; check the GST on each line yourself
• The Pipeline Management view lets you set stages such as Proposal Sent and filter leads by stage
• Managers can use the dashboard and team report in Sales Reports to see how the team's pipeline is moving
• Learn how to structure proposals with our guide on how to write a solar proposal and see a real example at solar proposal example India
• Book a demo or download the app to get started

What to do this week

1. Print the 12-item Proposal Quality Checklist and stick it next to every salesperson's workstation (or add it to your proposal approval WhatsApp group as a pinned message).
2. Open your last five sent proposals and check for the three most common errors: subsidy amount, customer name spelling, and reading time. Fix your template for any issues you find.
3. Add one nearby reference installation to your proposal template this week, include the customer's first name, neighbourhood, and system size.

Frequently asked questions

How many proposals should a solar salesperson send per week?

As a rough starting point (our judgement, not a measured benchmark), a full-time residential solar salesperson might send 8-15 proposals per week. If they are sending far fewer, the pipeline may be thin. If they are sending far more, quality may suffer. The target is quality over volume, a well-crafted proposal to 10 hot leads beats a generic one to 30 cold contacts.

Should every proposal go through manager approval?

For new reps (first 90 days), yes. After that, the Proposal Quality Checklist becomes the approval mechanism. Experienced reps self-certify using the checklist; managers spot-check one in every ten proposals.

How do I handle a customer who received a competitor's proposal with a higher subsidy number?

Ask to see the competitor's calculation. In most cases, they have used the wrong slab. Walk the customer through the correct calculation from the official MNRE slabs. Being the company that explains the truth earns trust, even if your number is lower.

What is the ideal proposal response time after a site visit?

Same day is excellent; within 24 hours is acceptable; beyond 48 hours is where you start losing deals. A customer who visited three competitors and got two proposals within a day will not wait for yours to arrive on day four.

How should I handle price negotiation via WhatsApp?

Never negotiate price on WhatsApp, it signals desperation and opens a race to the bottom. Acknowledge the inquiry: "Happy to discuss. Can we schedule a 10-minute call?" Price conversations on a call give you more control than a text thread.

What should I do if the customer does not open the proposal?

A proposal that was sent but may not have been seen (WhatsApp's blue ticks are a hint, and customers can switch them off) needs a different follow-up than one that got a reply. If there are no blue ticks, resend with a one-line message: "Hi Rajesh bhai, just checking you received the solar proposal I sent, sometimes it lands in the Documents tab on WhatsApp." If the customer saw it but did not reply, see the follow-up cadence guide.

Should I send proposals via email or WhatsApp?

WhatsApp first, email as backup. Most Indian residential customers check WhatsApp more often than email. Email is useful for commercial customers or where a formal record is needed.