Residential Solar Frequently Asked Questions
Solar System Performance & Efficiency
Yes — solar panels still produce electricity in cloudy or foggy weather, just at a reduced level. Expect around 25% of normal output, depending on cloud thickness.
Solar panels typically last 25–30+ years.
- Performance degradation: Around 0.5–1% per year
After 25 years: Usually still producing 75–87.5% of original output
Warranties: Most brands offer 25–30-year performance warranties
Durability: Designed for harsh weather; proper installation helps maximise lifespan.
This depends on your energy usage and system size. Most DMAK customers see payback around 6 years, sometimes faster if usage is high and the system is well-matched to the home.
At least twice a year. Dirty panels can lose up to 20% efficiency, so regular cleaning ensures optimal performance.
You can track live and historical data via the app or website provided by your inverter manufacturer.
Yes — if your inverter is oversized. Example: A 5.0 kW Fronius inverter with 3 kW of panels allows more panels to be added later (as long as roof space allows).
Hardware, Installation & Power Supply
Yes, your EV charger can run on solar power. With the right setup, excess solar can go directly into charging your vehicle, reducing grid usage and saving money.
Solar Panels
Product warranty: 10–25 years
Performance warranty: 25–30 years
Inverters
String inverters: 5–12 years (extendable to 20)
Microinverters: 10–25 years
Batteries
5–15 years or 6,000–10,000 cycles
Lithium-ion: typically 10 years with 70–80% capacity retention
Yes — but only if you have a battery.
Without a battery, your system shuts down for safety during outages.
Fronius PV Point option: A dedicated outlet that becomes live during a power cut only when the sun is shining — ideal if you want limited backup without installing full batteries.
Most residential installs take 1–2 days. After installation, an independent electrical inspector signs off the system to meet NZ regulations.
DMAK includes everything except the import/export meter (installed by your power retailer). This costs around $150, billed directly on your power account.
Financial, Exporting & Energy Use
Any unused electricity is sent back to the grid, and you receive a monthly credit from your retailer, this helps offset your power bill.
Bank green loans: 0–1% interest
MTF Finance: Can finance your solar system with flexible terms
Batteries, Backup & Home Energy Management
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Choosing a Solar Provider & Post-Installation Support
At DMAK Electrical, we’re more than just electricians – we’re your partners in powering a sustainable future. Here’s why you can count on us:
Expertise You Can Rely On
With years of experience and a team of qualified professionals, we ensure your solar system is designed and installed to perfection.
Sustainability-Focused
We’re passionate about helping you reduce your carbon footprint while saving on energy costs.
End-to-End Service
From consultation to installation and ongoing support, we’re with you every step of the way.
Customer Satisfaction
Our track record of happy clients speaks for itself. We tailor every solution to suit your unique needs.
Make the switch to solar with confidence – trust DMAK Electrical to light the way!
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What happens if my inverter stops working
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