Solar System Based On Roof Size

This calculator lets you estimate how many LG solar panels are likely to fit on your chosen roof. It allows the selection of multiple roof areas on your building, so you can increase the system size. You can select North, North West and North East facing roofs. Do not choose Southern facing roofs as they will produce very poor solar output. Please follow the step by step instructions. The calculations provided by the calculator serves as a guide only, you should seek advice from your solar installer.

Your place

Enter your address details

Select roof area

You now need to trace the roof area you wish to install solar on.

  • 1. Please use slider to zoom into your particular roof.
  • 2. Select the best roof area your panels should fit. North, North West and North East are all suitable. Avoid southern facing roofs.
  • 3. To mark the roof area click in one corner and then extend the red line to the next corner. Click again and continue the process to trace around your selected roof space. By closing the selected area the roof area should colour in, incase no colouring occurs just press enter. Now choose roof angle and number of obstacles which could cause overshadowing.
  • 4. If you wish to add another roof, press appropriate button. If only one roof press NEXT
  • You can zoom in a bit more onto your roof, using the +/- zoom slider on the map so your roof fills a significant part of the screen.
  • Drag the roof area into view by holding down the right click and drag image across the screen.

Set angle of your roof.

Select any additional roof area if required otherwise press continue.

Roof direction

Determine which direction the solar panels should face.

Set the direction of your solar panels by dragging the green arrow.
Please note: Ideally the short side of panels face the gutter, but LG panels can be mounted both in horizontal as well as vertical position.

Panel direction

You can rotate panels. Please note in most cases short edge of panel should face the gutter.

You can rotate the directions of the panels by clicking the button below, otherwise press Calculate potential system size.


Roof Panel

  • Rotate Roof
  • Remove Roof
  • Roof Area
  • Solar Panel
  • Roof Direction
  • {{ roofArea.index }}
    • {{ roofArea.areaSize }}
    • {{ roofArea.obstacle }} obstacles
    • {{ roofArea.angle }} degree
    • {{ roofArea.panelCount }} panels

Select the appropriate LG panel to determine the size of system, which can be installed on your roof.

  • {{ totalPanel() }}
  • {{ totalOutput() }} W
  • {{ estimatedSize() }}

Remember you wrote down the system size from the previous calculator.
You can see now if your roof is big enough to fit this size system

Find out how much money solar could save you

Next Calculator

Disclaimer: This calculator is not a precise solar system design tool and should be used as a guide only. The calculator is intended to give an estimate of the number of panels that could potentially fit on your roof.

LG always recommends a site inspection by a qualified installer to inform you as to how many solar panels will precisely fit on your roof. LG Electronics has been conservative in its calculations as to how many LG solar panels will fit on your roof. So after a site inspection the solar installer might be able to fit a few more panels, than our calculator predicted.

Please verify the information obtained through these calculators independently. In compiling these calculators LG Australia (LG) has utilised available data from the Clean Energy Council and the Australian Bureau of Meteorology. LG has used its best endeavor to ensure that the supplied calculations and information are correct, but LG takes no responsibility for any error or defect therein. LG Electronics shall not be liable for any loss or damage arising from the use or reliance of any data supplied by these calculators.