Short answer: most New Zealand homeowners are better off with grid-tied or hybrid solar, not fully off-grid. Off-grid makes sense mainly when there’s no practical grid connection at all, or when the cost of connecting one is close to (or more than) the cost of a self-contained system. Everyone else is usually solving the same problem – lower bills, backup during outages – more cheaply by staying connected.
That’s not the answer every solar company wants to give you, because a fully off-grid system is a bigger sale. But it’s the honest one, and it’s worth understanding the three real options before you spend anything.
The three options
| Grid-tied | Hybrid | Off-grid | |
|---|---|---|---|
| Still connected to the network | Yes | Yes | No |
| Battery included | No | Yes | Yes |
| Works during a grid outage | No (safety shutoff) | Yes | Yes, always |
| Typical use case | Cut daytime power bills | Cut bills + backup power | No grid connection available or affordable |
| Ongoing power bill | Reduced | Reduced | None – but no safety net either |
| Upfront cost | Lowest | Middle | Highest, for a given load |
Why grid-tied is the default for most people
If you’re already connected to the network, grid-tied solar is the cheapest way to cut your power bill – you use what the panels produce during the day and draw from the grid the rest of the time. The catch: standard grid-tied inverters shut off automatically during a power cut, for line-worker safety, so you lose power exactly when you might want it most.
Why hybrid is usually the better upgrade
Adding a battery to a grid-tied system – making it hybrid – solves that problem. You still get the low upfront cost of staying connected, but the battery gives you backup during outages and lets you store daytime solar for evening use. For most Auckland, Waikato and Northland households wanting both lower bills and some resilience, this is where we point people by default.
When off-grid actually makes sense
Off-grid earns its cost in a specific situation: when there’s no existing connection and running one in would be genuinely expensive – a remote bach, a new rural section a long way from the nearest line, or a lifestyle block where the quoted connection cost runs into five figures. In that situation, a correctly sized off-grid system can cost less overall than connecting, with no power bill afterwards. We’ve written more about that specific calculation for Waikato properties here.
Off-grid is a worse deal if you already have a grid connection and are just trying to cut your bill or add backup – in that case you’re paying to duplicate capacity the grid already gives you for free.
Frequently asked questions
Can I go off-grid and change my mind later?
Technically you can apply for a grid connection later, but you’ll pay the same connection costs you were trying to avoid, and possibly more. It’s worth being confident in the decision up front, or building a hybrid-ready system.
Do I need a bigger system if I go off-grid?
Yes – without the grid as backup, an off-grid system needs enough battery capacity and panel area to cover cloudy days on its own, so it’s typically oversized relative to a grid-tied or hybrid system for the same household.
Which option do you install most often?
Hybrid, by a clear margin – it’s the right fit for most on-grid Auckland, Waikato and Northland properties. Off-grid is common specifically for rural Waikato and Northland properties without an existing connection.