Sungrow vs Growatt vs Qbits: Solar Inverter Comparison

Three brands reach the same Indian rooftop shortlist for three different reasons. Sungrow arrives on engineering depth at scale. Growatt arrives on dealer availability and price. Qbits arrives on per-model datasheets and a published service partner network.

Disclosure: Qbits publishes this page, and Qbits is one of the three brands compared. Weigh the page accordingly.

It is built to survive that conflict in one specific way. Every limitation stated here about Sungrow or Growatt is either a published contract term with a link to its source, or a plain scope fact. None of it is an opinion about their build quality, because this publisher is not a neutral judge of that. Qbits carries its own stated limitations in the same format. Where a competitor genuinely fits a buyer better, the page says so.

The guide starts with who each company is and what it sells in India. Then a specification table built from published datasheets, with a verify column wherever a source is missing. Then warranty compared as terms rather than years, service and spares reality, monitoring platforms, and grid-code behaviour under Indian rules. It closes with a fit test by buyer type and the exact questions to put to each dealer in writing.

Short version. Sungrow suits inland commercial and utility projects where engineering depth matters and the site is away from the coast. Growatt suits price-led residential work with a local dealer who stocks spares. Qbits suits buyers who rank per-model datasheet detail and service partner coverage above brand familiarity, and who are buying inverters separately from panels. Compare the written terms for one exact model number, not the three brand names.

Where these three brands genuinely compete

They overlap in one band and diverge outside it. The real contest is the 3 kW to 50 kW grid-tied rooftop, plus hybrid units from about 3 kW to 12 kW. Below 3 kW the fight is with Indian retail brands rather than with each other. Above about 250 kW, Sungrow’s utility catalogue is far broader than Growatt’s, and Qbits enters with two published EHV models rather than a ladder.

So a three-way comparison is only honest inside the overlap. Outside it, one of the three is usually not a candidate at all.

If your project is a 2 MW ground mount, this page is the wrong shortlist. If it is a 10 kW factory rooftop or a 5 kW home, all three are real options and the differences below decide it.

Who each company is, and what it sells in India

Origin and Indian footprint move the decision more than most specification rows, because they determine who answers a service call.

Sungrow is a Chinese manufacturer headquartered in Hefei and one of the largest inverter suppliers globally. Its Indian strength is commercial, industrial, and utility work. Residential coverage runs through single-phase SG units, three-phase SG-RT units, and SH hybrids to roughly 10 kW. Asset managers already know its monitoring platform, which has real value on a large rooftop portfolio. The Sungrow model review covers the residential line in detail.

Growatt is a Chinese manufacturer with arguably the widest dealer availability of any imported brand in India. MIN TL-X single-phase units appear across a large share of residential quotations, roughly 2.5 kW to 10 kW with dual MPPT. Three-phase MID and MAX families cover commercial work, and SPH covers hybrid. Channel liquidity is the point here. When a unit fails in year four, a distributor who already holds the board matters more than a datasheet. See the Growatt model review and the direct Sungrow versus Growatt comparison.

Qbits is an Indian brand selling on-grid and hybrid string inverters through a dealer channel. It lists its service partners by state and district in a published service-partner locator. MNRE publishes ALMM lists for modules and cells and no list for inverters, so ask the seller for the exact model’s BIS registration and current certificates. Pricing is quote based through dealers, so there is no public list price to benchmark against the other two. That is a genuine disadvantage when you are trying to compare value rather than terms.

Specification comparison from published datasheets

The Qbits column below is taken from Qbits’ published product data behind the datasheet library and the product library. The other two columns carry a specification only where this page holds a source for it, and the single-phase 5 kW figures come from the manufacturers’ own datasheets listed under the matched table. Everything else is marked for verification rather than guessed, because a wrong voltage window is worse than a blank cell.

A matched single-phase 5 kW comparison

The three models below are each the 5 kW single-phase, dual-MPPT member of their family. All figures are copied from each manufacturer’s published datasheet, as of 14 October 2026. Regional versions of a datasheet can differ, so confirm the figures against the version supplied with your unit.

Sources: Qbits QB-4.0-6.0 kW 2MPPT datasheet; Sungrow SG4.0/5.0/6.0RS-L India datasheet, version 14, 2025 and its India product page; Growatt MIN 2500~6000TL-X2 datasheet.

Reading the table without picking a winner: the three are close on rated output and tracker count. They differ on how the voltage window is laid out. The Sungrow and Growatt units list a lower MPPT window edge (40 V against 80 V) and the Sungrow accepts 600 V at the input, which gives more room for long strings, while the Qbits TLD carries the higher per-tracker input current (20 A against 16 A), which suits higher-current modules. Which of those matters depends on your module’s voltage and current, so check the datasheet figures against the module before you compare anything else. Sungrow lists a newer SG..RS-L2 family on its India site, so confirm which generation your dealer is supplying.

Two notes on reading that table. Efficiency varies by model inside a single Qbits series, so never carry a top-model figure down the range. And the DC window column is the row that actually kills designs, so run your array through the string sizing calculator against the exact module before you compare anything else.

Warranty compared as terms, not years

A warranty is a set of clauses. The number of years is the least useful of them. Compare the remedy, the start date, any cap measured from production or delivery, the registration deadline, and the geographic exclusions.

Sungrow. String inverters sold through authorised dealers and distributors carry 5 years, capped at 6 years from the production date, per Sungrow’s Asia Pacific warranty terms (read 14 October 2026). Sungrow’s India product page states no warranty term, so this is the closest published document, not an India contract. The same document applies coastal derogations. For non-C5 products, cover falls to 2 years between 2 and 5 kilometres of the coastline, and is voided within 2 kilometres. C5-enclosure products are limited to 2 years within 500 metres of the coastline. Salt mist or corrosion beyond the design specification is a listed exclusion. Extended cover can be purchased up to a total of 25 years for specific product ranges, and the remedy is repair or replacement at Sungrow’s choice.

These are ordinary commercial terms, openly published, and they matter enormously across Gujarat, Kerala, Tamil Nadu, and coastal Odisha. Our coastal inverter guide sets out what to specify there.

Growatt. The standard period runs from the installation date on the installation certificate, and no more than six months after the delivery date, per Growatt’s published warranty procedure (2026). The year count varies by product line and is not stated in the page text. Warranty extensions must be purchased within two years of installation. If a sales order specifies a term, that order overrides the standard one.

The practical consequence matches Sungrow’s production-date cap. Stock that sat in a warehouse is worth less to you than stock that did not. Nothing on the box tells you which you are getting.

Qbits. Qbits publishes an expandable warranty, and the note carried on every Qbits product page is explicit that the public datasheets do not define the base term, the remedy, the registration deadline, or the exclusions. So on this row Qbits is the brand you can read least about before buying, and no duration comparison against Sungrow or Growatt is available. Obtain the current written warranty for the exact quoted model, and apply exactly the same document standard you would apply to an imported brand.

Worked example: what a production-date cap actually costs

This is arithmetic on a published clause and stated assumptions. It is not field data from any site.

Take a Sungrow dealer-channel string inverter on the Asia Pacific terms (confirm yours for India). The term is 5 years from first installation, capped at 6 years from the production date.

1. Unit is produced in month 0 and sits in the channel for 14 months.
2. Installation happens in month 14. Five years from installation would run to month 74.
3. The production-date cap stops at month 72.
4. Effective cover from your installation date is 72 minus 14, which is 58 months, or 4 years and 10 months. You lost 2 months.

Now stretch the channel age to 24 months. Five years from installation would run to month 84. The cap still stops at month 72, so effective cover is 48 months, exactly 4 years. You lost a full year of the term you believed you bought.

Value the exposure. On a 5 kW home rooftop at a planning yield of 4.0 kWh per kWp per day, an industry-observed figure for much of India, daily generation is 20 kWh. At a tariff of ₹8 per kWh that is ₹160 a day. A failure inside the year you unknowingly lost becomes a replacement cost you pay yourself, plus roughly ₹160 a day of lost generation while the array sits dead.

The fix costs nothing. Read the production or delivery date off the nameplate and the delivery note before you accept the unit, and put both dates in the handover document.

Service, spares, and why turnaround dominates real uptime

An inverter that cannot be serviced locally is a long warranty and a long wait. This is the row that decides uptime, and it is the row buyers check last.

Qbits publishes an authorised service partner directory so a buyer can check coverage by location before purchase. On turnaround, no current written Qbits service term sets a dispatch time, and the approval step carries no published duration either. Both are exactly the kind of gap a buyer should close in writing before purchase.

For Sungrow and Growatt, this page holds no first-party service commitment document for India, so it asserts none. Treat both as open questions and get answers from the named entity, not from a salesperson’s message. Ask which legal entity accepts the claim. Ask whether the field visit is performed by the brand, the importer, or your installer. Ask whether the partner covering your pincode stocks the replacement board today.

Spares policy after the term ends is the quiet one. Ask every brand how long it commits to supplying spares once the warranty expires. An inverter that cannot be repaired in year nine is a full replacement cost, and that single answer changes total cost of ownership more than a one-point efficiency difference. The warranty claim walkthrough covers the evidence a claim needs.

Monitoring and app ecosystems

All three publish a monitoring app and a cloud portal. The differences that matter are ownership, accessory dependency, and data granularity, not the interface.

Qbits publishes live iOS and Android listings for its own monitoring app. Sungrow uses iSolarCloud and Growatt uses ShinePhone, by the brands’ own published app names. Confirm which portal serves your exact model, because a brand can run more than one platform across product generations.

Then settle five questions for whichever brand you pick. Does the model need a separate logger, dongle, or SIM to report at all. Who owns the plant account, and how is it transferred if you change installers. Is per-MPPT string data visible, or only plant totals. Which faults raise an alert, and does it reach you or only the dealer. How long is history retained.

Per-string visibility is the one worth paying for, because it is how you catch an underperforming string before the annual bill does.

Grid-code behaviour on Indian feeders

This is where “works in India” becomes a checkable requirement rather than a claim. The controlling document is the Central Electricity Authority’s connectivity standard, and it applies to all three brands equally.

The rule is Regulation 11(6) of the CEA (Technical Standards for Connectivity of the Distributed Generation Resources) Regulations, 2013. The notification is dated 30 September 2013, amended by the First Amendment dated 6 February 2019. It requires the unit to trip above 110% or below 80% of nominal voltage, with clearing up to 2 seconds. On frequency it must trip at 50.5 Hz and above, or 47.5 Hz and below, with clearing up to 0.2 seconds. It must cease to energise within 2 seconds of unintended island formation, and 60 seconds of stability is required before reconnection. DC injection is limited to no more than 0.5% of full rated output current.

One carve-out travels with every one of those numbers. The regulation itself says a DISCOM may prescribe a narrower range. So the settings your utility enforces can be tighter than the national floor, and your inverter must be configurable to them. Confirm the CEA settings your DISCOM applies before commissioning, not after.

Islanding behaviour is tested to IS 16169:2019, the Indian adoption of IEC 62116:2014. That standard replaced IS 16169:2014 under the MNRE Solar Systems, Devices and Components Goods Order, 2025, notified 27 January 2025. Inverter safety sits separately under IS 16221 (Part 2):2015, the Indian adoption of IEC 62109-2:2011. Keep the two apart in your paperwork. Our anti-islanding explainer covers why a multi-inverter rooftop can mask the test condition.

Two practical asks follow. First, confirm BIS certification under IS 16221 for the exact model number, not the product family. Qbits and Sungrow datasheets print IS 16221 and IS 16169 references and the Qbits datasheets also print a BIS registration number. Treat a printed number as a lead for verification, and ask each brand for the registration record and certificate covering your specific model. Second, the AC voltage window decides how much of the afternoon voltage swing on a low-voltage feeder the inverter rides through without tripping. The published figures differ by model: 160 to 270 Vac adjustable on the Qbits QB-5KTLD, 154 to 276 V on the Sungrow SG5.0RS-L, 160 to 300 V on the Growatt MIN 5000TL-X2, and 90 to 290 Vac adjustable on the Qbits 4.2 to 6 kW single-phase TLS series. Ask for the figure on your exact model and confirm the setting your DISCOM requires.

The contrarian view: the brand on the box is the third variable

Rank the decision honestly and the brand name falls to third place.

First is the installer. Most rooftop faults in the first five years are not inverter hardware failures. They are DC wiring, earthing, connector water ingress, string design errors, and DISCOM-side voltage problems. Every one of those is diagnosed by whoever drives to your site, regardless of the logo on the enclosure.

Second is the service partner for your district. A global name with no partner within 300 kilometres gives you a long document and a long wait. A mid-tier brand with an engineer 20 kilometres away gives you a working array. Third is the brand and its terms, which is the only part a comparison page can help with.

The uncomfortable implication applies here too: no table can rank the variable that decides your uptime, because that variable is local to your pincode. So phone each brand’s named partner for your district before you compare specifications. Their answers reorder a shortlist faster than any datasheet.

The fit test: which buyer should pick which

These are starting points, and the service partner test above overrides all of them.

• 2 kW to 3 kW home, grid tied, subsidy claimed. Growatt, if your installer stocks it and can show the delivery date. Qbits if its per-model datasheet fit and written warranty, once you have them, are worth more than a lower sticker price. Verify scheme eligibility for the exact model with your DISCOM, since ALMM lists cover modules and cells, not inverters.
• 5 kW home, grid tied, no backup. Growatt on price and spares liquidity. This is the segment where Growatt’s channel depth is a genuine advantage over both others, and a buyer with a strong local Growatt dealer should probably take it.
• 5 kW to 12 kW home with battery backup. Compare hybrid battery protocol lists first, because compatibility decides this, not the brand. Get written confirmation of the exact battery model, nominal voltage, current limit, and BMS protocol from whichever brand you shortlist. “Lithium compatible” alone proves nothing.
• Coastal site, any size. Read Sungrow’s distance clause before anything else, and confirm that it applies to your sale, and specify the enclosure grade the manufacturer requires for full cover. If your site is inside 2 kilometres of the coastline, that clause alone may settle the decision against Sungrow. For exactly the same reason, demand each competing brand’s written coastal exclusion rather than assuming it has none.
• 10 kW to 50 kW commercial rooftop. All three are live candidates. Decide on service reach and warranty remedy, since the electrical fit is achievable with any of them.
• Above 250 kW, industrial or ground mount. Sungrow, on catalogue breadth and asset-manager familiarity with its platform. Qbits publishes two EHV models with 12 MPPTs as standard, which is a narrower ladder to design around. Note also that Qbits publishes no defined base warranty term at any capacity, so there is no warranty advantage to weigh at this scale until the written terms are produced.
• Buyer who wants panels, battery, and installation from one vendor. None of the three. Qbits sells inverters only, and that is the plainest limitation on choosing it.

What to ask each brand’s dealer in writing

Send the same list to all three and compare the replies, not the brochures. A dealer who answers all nine in writing has told you more than any specification table.

1. The full model number you are quoting, and the current datasheet PDF for that exact model.
2. The production or delivery date of the unit you will supply, plus the installation certificate date you will record.
3. The complete written warranty document, including remedy, start date, any cap measured from production or delivery, and the registration deadline.
4. The geographic and environmental exclusions, in particular any coastal or salt mist clause and the distance it applies from.
5. The named legal entity that accepts a claim, and the ticket channel with working hours.
6. The named service partner covering the site pincode, their phone number, and whether they hold the replacement board in stock today.
7. The spares supply commitment in years after the warranty term ends.
8. The BIS certificate number under IS 16221 covering this exact model, and its validity status.
9. The monitoring requirement: whether a logger, dongle, or SIM is needed, who owns the plant account, and whether per-string data is visible.

Record any unanswered item as unknown and award it no points. A load-bearing promise with no controlling document behind it is marketing, whichever brand made it. The reliability evaluation guide sets out the wider diligence sequence.

The Bottom Line

None of these three brands wins on every axis, and a page published by one of them should not pretend otherwise. Sungrow is the right answer for inland large-scale work, and its coastal clause is the right reason to rule it out near the sea. Growatt is the right answer for price-led residential jobs with a stocking dealer, and its install window is the right reason to check the delivery date. Qbits publishes per-model electrical detail in its datasheets, and its limits are real: inverters only, quote-based pricing, and public datasheets that do not define the base warranty term.

• Read the production or delivery date off the nameplate before you accept any imported unit, and put it in the handover document.
• Phone the service partner each brand names for your pincode, and ask their last turnaround time on this exact model.
• Send Qbits your array size, phase, and backup requirement for a model-specific shortlist backed by the published datasheets, then hold the other two brands to the same nine questions.