Growatt inverter review

The verdict

Cheap, widely installed, and the units generally work. What you give up is support when one does not, plus a standard warranty capped from the factory delivery date, so a unit that sat in a warehouse covers you for less.

Best for: Buyers facing a genuinely large price gap, with an established installer who will still be trading to handle a claim.

Look elsewhere if: The quote is cheap because everything in it is cheap. Get a GoodWe quote alongside it and see whether the gap is real.

Inverter cost only makes sense inside the full job. Start with the solar inverter guide.

The 30-second take

• Growatt was the fifth biggest inverter shipper globally in 2023 (Wood Mackenzie) and has 15+ years in the Australian market.
• Standard warranty is 5 years from installation, capped at 5.5 years from factory delivery. Extended 10-year cover is available on selected models.
• That 5.5-year backstop matters: an inverter that sat in a warehouse for a year gives you less than five years of cover.
• The MIN series (2.5–10 kW string, up to 98.1% efficiency) and MOD storage series (3–10 kW, 98.2–98.6% claimed) are the common residential units.
• The documented weakness is Australian support — described in trade review as "lacklustre support" and "tricky commissioning". Newer models are reported to be more reliable than older ones.

The case for Growatt

Scale, and price. Growatt shipped its way to fifth in the world by 2023 and has been selling into Australia for over fifteen years, which means parts exist, installers know the units, and the number on your quote will be lower than almost any alternative. You can also find vetted Growatt installers near you.

On specifications there is not much to complain about. The MIN string range covers 2.5 to 10 kW at up to 98.1% efficiency, and the MOD storage range runs 3 to 10 kW with claimed efficiency of 98.2 to 98.6%. Those are ordinary modern figures — the efficiency difference between a budget and a top-tier inverter is a rounding error next to the difference in what happens when it fails.

The warranty clock starts earlier than you think

Growatt's standard cover is five years from installation, with a hard ceiling of five and a half years from factory delivery. Read that twice, because the second half is the operative clause.

If the unit on your roof was manufactured and shipped eighteen months before it was installed — entirely normal for stock that moves through a distributor and sits in a warehouse — your five-year warranty is not five years. It is whatever is left before the 5.5-year factory ceiling closes. Extended 10-year cover is available on selected models and is worth pricing on that basis rather than as an upsell.

• Ask for the manufacture date, not just the model. It is on the unit and the installer can read it off before it goes up.
• Price the 10-year extension as insurance against the ceiling, not as a luxury.
• Get the serial number recorded on your invoice. A warranty claim on a budget brand is a paperwork exercise and you want to win it on the first email.

“Five years from installation, but never more than five and a half from the factory. Warehouse time comes out of your warranty, not theirs.”

The part the trade actually complains about

Growatt maintains Australian offices in Western Australia and South Australia with a shared support line, so this is not a brand with no local footprint at all. The criticism is about responsiveness rather than absence. The installer decides the outcome: see the vetted Growatt installers in your state before you sign anything.

The recurring themes in Australian trade review are "lacklustre support" and "tricky commissioning", with the assessment that Growatt's Australian support "needs to improve". The same reviewers note that newer models are reportedly more reliable than older ones, and that GoodWe is the alternative worth pricing if you want a budget unit with a better support story.

Translated into a homeowner decision: the risk you are buying is not that the inverter fails on day one. It is the length and difficulty of the process on the day it does fail, some years from now, mediated by whichever installer you chose — which is why the installer matters more here than on any big-name brand.

So should you accept the Growatt quote?

• Reasonable if the price gap is genuinely large, the installer is established and will still be trading to handle a claim, and you have priced the extended warranty.
• Reasonable if the alternative is not buying solar at all. A working budget system beats a perfect one you did not install.
• Think harder if the quote is cheap *because* everything in it is cheap. A budget inverter chosen deliberately is a decision; a budget inverter alongside budget racking and a subcontracted crew is a pattern.
• Get a GoodWe quote alongside it. Same market segment, better-documented support, and you will find out quickly whether the price gap is real.

Don't choose a 10-year system based on a 10-minute quote. Get matched with 2-3 vetted solar installers — typically 2+ years in business, with a track record of decent reviews — and ask each of them, plainly, who handles a Growatt warranty claim in year six. If Growatt is the shortlist, find vetted Growatt installers in your state and compare the quotes side by side.

Read next

• What replacing an inverter costs
• GoodWe inverters compared
• The Growatt battery range, reviewed
• When your installer goes out of business

Sources

• solarquotes.com.au — Growatt inverter review (warranty terms, MIN/MOD series, AU offices, support assessment)
• solarquotes.com.au — how much does a solar inverter cost?
• cleanenergycouncil.org.au — consumer guide to buying solar PV