Search for opinions on home solar and you’ll find two camps shouting past each other. One says it’s free money and you’d be mad not to; the other says it’s an overpriced con that never pays off. The truth is calmer, and far more useful, than either. Solar in New Zealand is a solid, low-risk investment with real and specific benefits — and a handful of genuine downsides the sales pitch tends to skim over. Here’s the honest ledger, so you can weigh it up for your own home rather than for the salesperson’s.
The pros — what solar actually delivers
Lower power bills, for decades
This is the headline, and it’s real. Every unit of electricity your panels make and you use is a unit you don’t buy at around 39c/kWh. For a household that uses power during the day, that can take a meaningful slice — often a third to a half — off the annual bill. Panels are warranted for roughly 25 years and usually keep going well beyond, so you’re buying two-plus decades of cheaper power with a single up-front spend.
A hedge against rising prices
Electricity prices in New Zealand have trended upward for years. Once your system is paid off, the power it makes is effectively free no matter what happens to retail rates — so solar is partly an insurance policy against future increases, not just a saving at today’s prices.
A sound, low-volatility return
Set against where else you might park the money, a well-sized system that pays back in roughly six to nine years and then runs for another 15-plus is a respectable, steady return. And unlike interest on a bank deposit, the “return” here — money you no longer hand to your retailer — isn’t taxed.
It’s genuinely low-hassle
No moving parts, rain does most of the cleaning, and a decent system largely looks after itself. After install you can mostly forget it’s there beyond an occasional glance at an app.
Some resale appeal, and lower emissions
A paid-off, owned system can be a modest selling point, and you’ll be running on your own clean generation. In New Zealand — where the grid is already around 80–90% renewable — the climate gain is smaller than in coal-heavy countries, but it’s real, and it matters to plenty of buyers.
The cons — the downsides the pitch skips
The up-front cost is real
A typical 5–6.6 kW system runs around $12,000–$16,000 installed. Cheap “green” finance softens the blow, but it’s still a significant commitment, and it’s the single biggest reason people hesitate.
Export pays poorly
The surplus you send to the grid earns far less than you pay to buy power back — often 7–17c against roughly 39c. So a system that exports most of its output (think: an empty-all-day house) saves much less than the brochure’s best case. Self-consumption, not panel count, is what drives the return.
Payback isn’t instant
Six to nine years is the realistic range for a well-matched system, and longer if your usage is low or mostly after dark. Anyone promising a three-year payback is either describing a perfect-case home or stretching the truth.
The inverter will likely need replacing
Panels last decades, but the inverter — the box that converts your panels’ DC into usable AC — typically lasts 10–15 years. Budget for one replacement, around $1,500–$3,000, over the system’s life. Cheap quotes quietly leave this out.
Output swings with season and weather
Your panels make far more on a long summer day than in grey July, and less under heavy cloud. Grid-tied systems also shut down in a power cut — for the safety of line workers — unless you’ve specifically paid for battery backup. That last one genuinely surprises people who assumed solar means the lights stay on in an outage.
The market has sharks
Solar attracts high-pressure selling — invented “rebates”, fake deadlines, inflated savings figures. The product is good; some of the sellers aren’t. That’s a reason to vet the installer hard, not a reason to avoid solar.
How to read this ledger for your home
The pros and cons aren’t fixed weights — they shift with your household:
- If you use power during the day, or you’ll add a battery or an EV, the pros dominate and the cons are manageable. Solar is very likely worth it.
- If your house is empty all day and your bills are low, the export-pays-poorly con bites hardest, and the case is weaker until you add storage or shift usage into daylight.
So “are the pros worth the cons?” has no universal answer — it turns almost entirely on when you use electricity. The realistic summary: for a well-suited New Zealand home, solar is a sound, slightly boring investment that quietly saves money for decades, with downsides that are real but manageable once you know to plan for them.
Want the ledger tallied with your actual numbers — your usage, your roof, your likely payback, and the inverter cost included? Our free assessment does exactly that, with no imaginary rebates.
Sources: Cost, payback, and retail/export price ranges per MBIE, the Electricity Authority, and EECA; grid renewable share per MBIE energy statistics. Figures are indicative and vary by home.