The cost of installing solar panels for a house in Auckland varies depending on several factors, such as the size of the system, the type of panels and components used, the installation cost, and the electrical work required. However, as a rough estimate, a typical 5 kilowatt (kW) solar panel system for a house in Auckland could cost anywhere between $15,000 to $20,000 NZD.

Keep in mind that the cost of solar panels may be offset over time by the savings on your electricity bills, so it is important to consider the long-term financial benefits when making your decision.