Why solar export limits matter (and why they’re not the end of the world)

As solar energy becomes more popular with Kiwis, one topic is coming up more often, and it’s one that can catch even the most knowledgeable homeowners off guard: export limits.

At SolarLink, we’re here to support installers, developers, and professionals across New Zealand with everything from system design to network approvals. And one of the most common questions we get is: “If my solar is being limited, am I just wasting power?”

Let’s take a closer look and clear up any confusion.

So, what exactly is an export limit?

When your solar system generates more power than you’re using at home or work, the extra energy gets sent back to the grid. Sounds pretty ideal, right?

But to keep the local electricity network stable and safe, there’s a cap on how much energy you’re allowed to send back to the grid — this is called the export limit. For most homes and small businesses in New Zealand, the export limit is typically 5kW per phase, or no limit for balanced three-phase systems, though it can vary depending on your local network and location.

This means that on a bright summer’s day, if your system is generating 10kW, only 5kW might be allowed to be exported to the grid, and the rest will be automatically curtailed by your inverter.

Does that mean I’m wasting power?

Not quite. This is where context really matters.

Yes, your inverter is throttling down the energy sent to the grid to stay within the export limit, but most well-designed solar systems in New Zealand aren’t just sized for the peak summer days. They’re sized to deliver reliable performance throughout the year.

Here’s how it works:

• In winter and on cloudy days, you’ll probably use almost all the power your system generates.
• During spring and summer, you might hit the export limit for a few hours in the middle of the day when your usage is low.

So, while some export may be curtailed during the peak summer months, your system is still doing its job well by providing solid energy production year-round.

It’s a bit of a trade-off: oversizing the system slightly might mean some “wasted” export during summer, but it ensures better performance in the colder months and during cloudy weather.

How to work with export limits (instead of against them)

At SolarLink, we work with installers to help get the balance right. If export limits are in play (which they usually are), we focus on strategies like:

• Maximising self-consumption: use the energy you generate. Charge electric vehicles (EVs), heat water, or run appliances during daylight hours.
• Adding batteries: store excess solar energy for later instead of sending it back to the grid.
• Smart inverter control: set limits on your export, or apply for dynamic export management if your area allows it.
• Designing to match load, not just roof space: sometimes bigger isn’t better. If your customer isn’t using all that energy, it’s not worth over-sizing the system.

Why export limits aren’t the end of the world

We get it — no one likes the idea of wasting energy. But in the real world, systems that experience a little bit of curtailment are often the most cost-effective in the long run. That extra generation capacity means better performance during winter, more energy on cloudy days, and enough power to meet larger daytime energy needs.

Let’s also remember the goal isn’t necessarily to export everything. It’s about reducing your power bills, gaining energy independence, and making smarter use of energy on-site.

The SolarLink approach

Whether you’re installing systems, designing for new builds, or navigating DG (Distributed Generation) approvals, understanding export limits — and how to make them work for you — is crucial.

At SolarLink, we’re here to make the whole process easier. We help you design, plan, and implement solar systems that perform year-round — with fewer headaches and better outcomes.