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Any roof angle (except from the south) can be used for solar panel installations. North facing solar panels are preferable as they generate more power. East facing solar panels generate more power in the morning which is ideal for some households, while west facing panels generate more power in the afternoon.
It is possible to install solar panels on multiple roof directions, but for this estimate please choose the dominant roof direction.
If a roof slope is 0° then it's best to tilt solar panels to at least 10° or more. Why? Because solar panels facing the sun generate more power. At this angle the panels also self clean in the rain.
For solar panels facing north, the ideal roof slope is between 25° and 30° to obtain optimum solar power from the panels.
The average residential solar power system size in New Zealand is 4kW.
A 4 kW system consists of between 11 and 14 solar panels, dependent on the size of the panels.
Commercial: Commercial sized systems typically start at 10kW (for instance, a small convenience store) and up to 150kW for a large big-box store.
The default prices should be considered a rough guide. They assume installations will consist of standard roofing and will be straight forward installations. The full price guides can be viewed on the links below.
Residential solar price guide
Commercial solar price guide
This price is easily available from your power bill if you have one on hand.
Otherwise select your region from the list to get the average power price in the area.
This is the price that electricity retailers are willing to pay for the solar power that is exported to the grid.
The higher the buy-back price, the more savings to be made on power bills.
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