How It Works
The right installer for your roof.
We don't recommend one installer to everyone. We match the right installer to the right client - through five disciplined steps.
- 01
Energy Profile Analysis
We analyse your power bills and consumption patterns, day vs. night usage, battery suitability, and future load growth such as EVs.
- 02
Roof & Site Technical Assessment
Including roof orientation, pitch and shading, installable capacity, grid connection and switchboard capacity.
- 03
Multi-Installer Proposal Comparison
From our installer network, we compare system design logic, realistic production estimates, equipment matching, warranty terms and true value for money - not just lowest price.
- 04
Risk Screening
We identify overpromised production, unrealistic ROI claims, unnecessary battery upselling and hidden installation risks.
- 05
Installation Oversight
We assist clients in confirming the system matches the contract, the installation quality, and that monitoring is operational.
Real client case - Auckland
From $300+/month to ~$180. Future-proofed.
An Auckland family was paying $300+/month on power and planning to add an EV. We coordinated a right-sized, battery-ready system - here are the actual numbers eight months in.
The system
Battery-ready7.05 kW + hybrid inverter
- Panels
- 15 × Longi Hi-MO X6 470W
- Inverter
- Solax X1-HYBRID-7.5D
- Mounting
- Clenergy Iron Roof
- Panel warranty
- 25 years
- Workmanship
- 5 years
- Total (incl GST)
- $13,092
Actual outcome
Real bill data~45-55% off the power bill
- Power bill before
- $300+/month
- Power bill now
- ~$180/month
- Avg daily usage
- 24.1 kWh
- Solar exported
- Significant (chart below)
- Payback (w/ daytime EV charging)
- ~4 years
Why this design - and how SGS added value
- Hybrid inverter (Solax X1-HYBRID-7.5D) - costs a little more upfront, but the system is battery-ready: the client can add storage later as prices fall, without replacing the inverter.
- Longi Hi-MO X6 470W panels with a 25-year product warranty - tier-1 quality, not a no-name brand swap-in.
- Right-sized to the household's usage profile - no battery upsell when buyback economics don't yet support one.
- Negotiated a free 16th panel (approved by the installer's National Sales Manager) - ~$700 of extra capacity at no extra cost to the client.
More than payback
Solar isn't just a power bill - it's a capital improvement to your home.
New Zealanders tend to ask "how many years to pay back?" - and forget that solar adds to the property's capital value. Nobody expects a deck to pay itself back, yet a deck clearly lifts what the home is worth. Solar works the same way.
"New Zealanders tend to view rooftop solar as, 'it has to pay for itself.' Without looking at the fact that you've actually improved the capital value of the property... it's a capital improvement that's attractive to a new buyer."
NZ financial journalist Frances Cook recently calculated that her household's switch to solar has delivered a higher rate of return than the stock market - and that's before the power-bill savings that continue after payback.
Further reading: EECA - Is solar right for your home? · Tom's Guide - 7 things I wish I knew