Qbits + QuickEstimate: The Complete Solar Stack for Indian EPCs

Most Indian solar EPCs run a split personality. The hardware side buys inverters from one distributor, modules from another, and service from whoever answers the phone. The sales side runs on Excel, a phone calculator, and a PDF the intern made in Canva. When a 5 kW deal slips because the quote went out three days late, nobody can say which side failed.

The Qbits QuickEstimate stack is our answer to that split. Pair Qbits Energy inverters on the hardware side with QuickEstimate proposals and CRM on the sales side, and one Heaven Group-backed workflow carries a lead from first WhatsApp message to commissioned, subsidy-credited system.

This guide covers the full stack: which Qbits model fits which system size, what the 8+4 warranty is actually worth in rupees, how the WhatsApp alerts-to-proposal workflow runs day to day, and how to put a Qbits line item inside a subsidy-ready proposal your customer signs.

What is the Qbits + QuickEstimate stack?

The Qbits + QuickEstimate stack is a two-layer setup: Qbits Energy supplies the inverter hardware (on-grid and hybrid, 1 kW residential to 110 kW industrial), and QuickEstimate runs the sales workflow (leads, proposals, subsidy math, follow-ups) for 1,000+ Indian EPCs.

Qbits is the inverter brand of the Heaven Group, the Surat-based solar group behind Heaven Green Energy, a residential EPC with 10,000+ installations since 2017. Every Qbits unit passes 1000+ automated quality tests, carries an IP66 enclosure, and is certified to BIS IS 16221, IEC 62109/62116, and ISO 9001:2015 (Qbits Energy, 2026). Over 100,000 Qbits inverters are installed across 25+ states, backed by 500+ distributors and a sub-48-hour service response promise.

QuickEstimate is the software layer our own team builds in Surat. It sends subsidy-ready branded PDF proposals in 60 seconds, auto-calculates the PM Surya Ghar grant, delivers over WhatsApp with read tracking, and keeps your pipeline and follow-up reminders in one Android-first app.

Put together, your sales rep quotes a Qbits model by name, the customer sees a branded proposal the same evening, and after commissioning the inverter's own AI-powered WhatsApp alerts keep the service relationship alive. One group stands behind both layers, so there is no finger-pointing between your hardware vendor and your software vendor.

Why hardware and sales workflow belong in one stack

The short answer: the inverter is roughly 12% of project capex on a large plant (industry EPC benchmarks, 2026), but it drives a far bigger share of your after-sales headaches and your customer's trust. Pairing it with your quoting tool removes the two most common deal-killers we see, slow proposals and vague warranty promises.

Here is the demand context. PM Surya Ghar Muft Bijli Yojana, launched by the Ministry of New and Renewable Energy (MNRE) on 13 February 2024, had solarised 40 lakh households by May 2026 against a target of 1 crore (Union Minister Pralhad Joshi, reported by SolarQuarter, 2026). Residential rooftop installed cost runs ₹55,000 to ₹85,000 per kW (Vikram Solar, 2026). Every one of those systems needs an inverter, and every one started as a proposal someone sent.

When hardware and workflow come from the same stable, three things improve. Your bill of quantities (BOQ) stops changing every month, your warranty pitch stays consistent across reps, and your service calls route to one number instead of a distributor group chat. Our solar installer software stack guide maps the rest of the tooling around this core.

Which Qbits inverter fits which system size?

Qbits covers 1 kW to 110 kW, so the sizing rule is simple: single-phase on-grid models for homes up to 10 kW, three-phase string inverters for commercial rooftops from 10 kW upward, and hybrid models only where the customer genuinely needs battery backup.

A 5 kW grid-tie string inverter sells on the street for ₹28,000 to ₹48,500 (IndiaMART listings, 2026), so model choice moves your quote by a meaningful amount. For the full market picture, cross-check our solar inverter price in India tracker and the string inverter vs microinverter comparison before you standardise.

Two rules we give every rep. First, size the inverter at 0.9 to 1.0 times the DC capacity of the array, not above it; oversizing the inverter wastes money and adds no generation. Second, quote the hybrid only when the customer names a backup load, like a lift in a society or a refrigerator in a clinic. Our on-grid vs off-grid vs hybrid explainer walks through the decision logic customers ask about.

What the 8+4 year warranty is actually worth

Qbits offers an 8+4 year full replacement warranty: eight years of full replacement cover as standard, extendable to twelve years total (Qbits Energy, 2026). On a ₹40,000 inverter, that is roughly ₹3,300 per year of insured risk, before you count the service visit cost you avoid.

Here is the myth we want to kill. "All inverters fail at year six anyway, so buy the cheapest one." The maths says otherwise. A no-name 5 kW unit at ₹28,000 with a 5-year warranty that dies in year 6 costs you ₹28,000 replacement plus ₹3,000 to ₹5,000 in labour and transport, plus the customer relationship damage. A Qbits unit under full replacement warranty in year 6 costs you a phone call. Over a 10-year horizon, the cheap inverter is often the expensive one.

Warranty only matters if service reaches the customer. Qbits commits to a sub-48-hour service response across 25+ states with 100+ service partners (Qbits Energy, 2026). For an EPC in Surat (DGVCL territory) or Pune (MSEDCL), that means the brand sends the technician, not your own install crew. Your team stays on new revenue instead of free revisits.

When you write the proposal, put the warranty on page one, not in the annexure. "8+4 year full replacement warranty on the inverter, service response under 48 hours" is a sentence that closes deals against a competitor quoting a bare "5 year warranty" line. Our guide on what to include in a solar quote shows where this line sits in the document.

The Hardware-to-Proposal Loop: the workflow that ties it together

The Hardware-to-Proposal Loop is our five-step motion for selling a Qbits-backed system without ever opening Excel: spec, quote, subsidise, send, and track. Reps who run all five steps in one sitting close measurably faster than reps who "send the quote tomorrow".

1. 1

   Spec the Qbits model at the site survey

   Pick the model from your two standard SKUs for that size band while still on the roof, using the sizing table above. No "we will confirm the model later" line in the quote.

2. 2

   Quote the full BOQ with the model named

   Modules, inverter by model name, structure, cabling, protection, labour. A named model signals a real company; "5 kW inverter" signals a trader. Our solar BOQ software guide covers the line items.

3. 3

   Apply the PM Surya Ghar subsidy automatically

   ₹30,000 per kW for the first 2 kW plus ₹18,000 for the third, capped at ₹78,000 (MNRE 2024 guidelines). QuickEstimate computes this from the system size, so the rep never touches the slab table in our PM Surya Ghar subsidy slabs post.

4. 4

   Send the branded PDF over WhatsApp before leaving the lane

   The proposal lands while the customer still remembers the site visit conversation. Same-evening delivery is the single biggest close-rate lever we see across our EPC base, as our WhatsApp solar proposals playbook explains.

5. 5

   Track the read receipt and follow up on day 1, 3, and 7

   Read tracking tells you whether the silence means "not interested" or "not seen". The follow-up reminder fires automatically, so discipline does not depend on the rep's memory.

Here is a hypothetical example. A Surat EPC quotes a 5 kW rooftop for a textile trader in DGVCL territory: ₹3.25 lakh gross, ₹78,000 CFA, net ₹2.47 lakh. The rep names a Qbits 5 kW on-grid unit in the BOQ, sends the proposal from the customer's compound at 6:40 pm, sees it read at 8:15 pm, and calls the next morning. Deal signed in four days. A competing EPC's typed WhatsApp message arrived on day three, after the decision was made.

On-grid or hybrid Qbits: the honest tradeoff

For most Indian homes on PM Surya Ghar, on-grid is the right answer; hybrid earns its premium only when the customer has a defined backup load and frequent outages. Hybrid inverters typically cost 15 to 25% more than on-grid equivalents (Qbits Energy TCO guide, 2026), and the battery is a separate five-figure decision.

Our opinionated take: stop upselling hybrid to every PM Surya Ghar lead. The CFA (Central Financial Assistance) applies to the grid-connected system, net metering requires a grid-tied bidirectional meter, and most urban customers in Surat, Bengaluru (BESCOM), or Chennai (TANGEDCO) see under two hours of outages a month. Selling them a hybrid with batteries adds ₹60,000 or more for a problem they do not have, and it slows the deal. Reserve the Qbits HS hybrid pitch for clinics, cold storage, and homes in genuinely unreliable grids.

If the customer asks about backup, quote both: on-grid as the recommended option with payback math, hybrid as the alternative with the battery cost shown separately. Showing both builds trust and usually lands the on-grid deal you wanted. The hybrid solar glossary entry and the string inverter entry are useful links to forward to a research-happy customer.

How to quote a Qbits system inside a subsidy-ready proposal

A subsidy-ready proposal has four non-negotiable blocks: system sizing with generation estimate, itemised BOQ with the inverter model named, the CFA deduction shown as its own line, and the payback period at the customer's actual DISCOM tariff. Miss any one and the customer cannot compare you fairly, so they compare you on price alone.

The subsidy math for residential: ₹30,000 per kW for the first 2 kW, ₹18,000 per kW for the third kW, capped at ₹78,000 for systems of 3 kW and above (MNRE, 2024 guidelines). Payback varies sharply by state tariff. A 3 kW system pays back in about 3.0 to 3.5 years in Maharashtra at roughly ₹9.50 per unit (MSEDCL), and 4.5 years or more in Uttar Pradesh at roughly ₹6.50 per unit (UPPCL) (SERC tariff-based estimates, 2026). In Gujarat, surplus export earns ₹2.25 per unit for residential systems (GERC, 2024).

One compliance note for 2026. ALMM (Approved List of Models and Manufacturers) List-II for solar cells took effect on 1 June 2026, and MNRE's latest update limits the exemption window for net-metering and open-access projects to 31 December 2026 (MNRE, 2026). DCR (Domestic Content Requirement) modules commanded roughly a 70 to 100% premium over non-DCR in early 2026 (SMM, 2026). Your proposal should name DCR-compliant modules for subsidy jobs, and QuickEstimate keeps the CFA math current so the numbers stay honest.

The Heaven Group bench behind the stack

The Qbits QuickEstimate stack sits inside a wider Heaven Group bench, so an EPC can grow without changing vendors: Heaven Green Energy for EPC execution benchmarks, SurgePV for design and simulation, and Heaven Designs for engineering at scale.

Heaven Green Energy is the group's residential EPC arm, founded 2017 in Surat, with 10,000+ installations, a 38-day average installation cycle, and the top-rated residential EPC slot on the PM Suryaghar Portal (Heaven Green Energy, 2026). When a customer asks "who else uses this inverter", that install base is your proof.

For your own design work, SurgePV handles AI roof modeling in under 60 seconds, shading analysis, and P50/P75/P90 bankable yield reports, useful when a commercial client wants a yield guarantee. And Heaven Designs covers MW-scale detailed engineering, permit design, and PMC work, with 102+ MW designed for 300+ EPC clients (Heaven Designs, 2026). You sell with QuickEstimate, you quote Qbits, and when a 500 kW factory job needs stamped drawings, the same group has the engineering desk.

How QuickEstimate fits

QuickEstimate is the sales half of the Qbits QuickEstimate stack: it is where the Qbits model you specced on the roof becomes a signed deal. Without it, the Hardware-to-Proposal Loop breaks at step 4, because the "quote" becomes a typed WhatsApp message three days later. With it, your rep runs all five steps from one Android phone, your office sees every proposal sent and read, and the PM Surya Ghar math is never wrong in the customer's favour by accident.

• Proposal Generator, 60-second branded PDF with the Qbits model named and the CFA line pre-filled.
• WhatsApp Follow-up, send the proposal in the customer's chat and see when it is read.
• Quotation System, standardise your two Qbits SKUs per size band so every rep quotes the same price.
• Pipeline Management, see which Qbits-quoted deals are stuck and who is following up.

Pricing is simple: free for 10 proposals a month, Pro at ₹6,999 per user per year with a 3-user minimum (see pricing). If you want a walkthrough with your own BOQ loaded, book a demo and we will build a Qbits quote live. For the wider evaluation framework, our solar CRM buyer's guide is the checklist we would use ourselves.

What to do this week

Pick one action per day and the stack is live inside a week.

1. Today: pull your last 20 proposals and count how many named the inverter model. If fewer than half did, that is your first fix, and it costs nothing.
2. Tomorrow: choose your two standard Qbits SKUs per size band (on-grid plus hybrid) from the sizing table above, and confirm distributor pricing and warranty terms at qbitsenergy.com.
3. This weekend: load those SKUs and prices into QuickEstimate's quotation system on the free plan, send one test proposal for a 3 kW PM Surya Ghar job, and time yourself. Under five minutes means the loop works.

Frequently asked questions

What is the Qbits QuickEstimate stack?

It is the combination of Qbits Energy inverters (hardware, 1 kW to 110 kW) with QuickEstimate's proposal and CRM app (sales workflow). An Indian EPC specs a Qbits model at the site survey, generates a subsidy-ready branded proposal in 60 seconds, sends it over WhatsApp with read tracking, and manages follow-ups in one pipeline. Both layers sit within the Surat-based Heaven Group, so hardware and software support come from one vendor family.

Is Qbits a good inverter brand for Indian conditions?

Yes, for the conditions Indian rooftops actually face. Qbits inverters are rated for 50°C-plus ambient operation, carry IP66 enclosures against dust and monsoon, reach 98.8% efficiency, and pass 1000+ automated quality tests (Qbits Energy, 2026). Certifications include BIS IS 16221, IEC 62109/62116, and ISO 9001:2015. Over 100,000 units are installed across 25+ states with a sub-48-hour service response commitment.

What does the Qbits 8+4 year warranty mean?

It means eight years of full replacement warranty as standard, extendable by four more years to twelve years total (Qbits Energy, 2026). Full replacement means a failed unit is replaced, not repaired piecemeal. For comparison, many budget inverters sold in India carry five-year warranties, so the Qbits cover roughly doubles the insured life of the component most likely to need service.

Can I show the PM Surya Ghar subsidy automatically in a QuickEstimate proposal?

Yes. QuickEstimate computes the Central Financial Assistance from the system size you enter: ₹30,000 per kW for the first 2 kW, ₹18,000 for the third kW, capped at ₹78,000 for 3 kW and above (MNRE 2024 guidelines). The subsidy appears as its own deduction line in the branded PDF, so the customer sees the gross price, the grant, and the net outlay without your rep doing manual math.

Should I quote an on-grid or hybrid Qbits inverter for a PM Surya Ghar home?

Quote on-grid for most PM Surya Ghar homes. The scheme subsidises grid-connected systems, net metering requires grid-tie, and hybrid hardware adds 15 to 25% to inverter cost before batteries (Qbits Energy, 2026). Reserve the Qbits HS hybrid for customers with a named backup load, such as a clinic refrigerator or a society lift, or in areas with genuinely long outages. When in doubt, quote both and let the payback math decide.

How many proposals can I send on QuickEstimate's free plan?

The free plan includes 10 proposals per month with no card required. The Pro plan costs ₹6,999 per user per year with a minimum of 3 users, and adds the full pipeline, follow-up reminders, and reporting. Most 3-to-12-person EPCs start on the free plan to test the 60-second proposal workflow, then upgrade when proposal volume crosses 10 a month.

Does Qbits service reach smaller cities, or only metros?

Qbits reports 500+ distributors and 100+ service partners across 25+ states, with a sub-48-hour service response commitment (Qbits Energy, 2026). Active states include Gujarat, Rajasthan, Maharashtra, Madhya Pradesh, Uttar Pradesh, Karnataka, and Tamil Nadu among others. For an EPC outside a metro, confirm the nearest service partner with your distributor before your first installation, and write the response commitment into your own customer proposal.