How solar installation works in NZ
Solar installation in NZ takes one to two days on the roof, following an on-site assessment and a short design phase. As of September 2026, all grid-connected solar and battery installs must be completed by an EWRB-accredited electrician — a quality standard every installer in the Solar Alliance network meets.
Here's exactly what happens from first enquiry to a switched-on system, and how to make sure you pick a good installer.
The installation process, step by step
- On-site assessment (~1 hour) — a qualified installer visits, assesses your roof (orientation, pitch, condition, shading), reviews your power bills, and sizes a system. You get a written quote with no obligation.
- Design and approval (1–2 weeks) — the installer designs the system and arranges grid-connection approval with your lines company. Most standard installs don't need building consent.
- Installation (1–2 days) — panels are mounted, cabling is run, and the inverter is installed and connected by EWRB-certified electricians.
- Grid connection & commissioning — your lines company connects the system and activates export metering; you get access to a monitoring app.
- Retailer setup — you notify your power retailer to activate the feed-in tariff so you're paid for surplus power you export.
EWRB accreditation — why it matters
From September 2026, electricians installing grid-connected solar and battery systems in NZ must hold a specific accreditation from the Electrical Workers Registration Board (EWRB), the government regulator for electrical workers in New Zealand.
This matters because a solar system is a permanent, grid-connected electrical installation on your home — poor workmanship is both a safety risk and a performance risk. When comparing quotes, confirm your installer holds the relevant EWRB accreditation. Every installer in the Solar Alliance network is EWRB-certified and SEANZ-accredited.
How long does the whole process take?
From first enquiry to a switched-on system is typically 2–4 weeks. The on-roof work is the quick part (1–2 days); most of the elapsed time is the design and the lines-company grid-connection approval. Complex roofs, heritage properties, or switchboard upgrades can add time — your installer will flag these at the assessment.
How to choose a good solar installer in NZ
The installer matters more than the brand of panel. Look for:
- EWRB accreditation — required for grid-connected installs from September 2026
- SEANZ membership — the Sustainable Energy Association of New Zealand sets industry standards
- Appropriate insurance — public liability and workmanship cover
- Genuine local reviews — from customers in your region, not just a national average
- A clear written quote — itemised, with the equipment specified, not a vague headline price
Rather than vetting installers yourself, Solar Alliance connects you with a local installer who already meets every one of these standards — and arranges your free assessment. Find solar quotes near you.
After installation
Once commissioned, your system runs automatically. You'll use a monitoring app to see real-time generation and savings. Solar needs very little maintenance — an occasional visual check and keeping panels reasonably clear of debris. Most panels carry 25-year performance warranties and inverters 5–10 years.
Wondering whether it all adds up for your home? See whether solar is worth it, or what solar panels cost in NZ.
Common questions
How long does solar installation take in NZ?
The on-roof installation typically takes 1–2 days. The full process from enquiry to a switched-on system is usually 2–4 weeks, most of which is design and lines-company grid-connection approval.
Who is allowed to install solar panels in NZ?
From September 2026, grid-connected solar and battery systems must be installed by an EWRB-accredited electrician. Every installer in the Solar Alliance network holds this accreditation and is SEANZ-accredited.
Do I need building consent to install solar in NZ?
Most standard residential rooftop installs do not require building consent. Your installer handles the grid-connection approval with your lines company. Heritage buildings or structurally unusual roofs can be exceptions.
What happens on solar installation day?
Installers mount the panels and racking, run the cabling, and install and connect the inverter — usually in a garage or utility area. EWRB-certified electricians complete the connection, then the system is commissioned.
How do I choose a good solar installer in NZ?
Check for EWRB accreditation, SEANZ membership, appropriate insurance, genuine local reviews, and a clear itemised written quote. Solar Alliance connects you only with installers who meet all of these standards.