The size of your property: The larger the ground space, the bigger capacity your device will have to be. Should you have a multi-storey household, it's possible you'll involve many units for various zones, that may incorporate to the whole Value. The federal government Strength ranking Site has extra details https://docs.google.com/spreadsheets/d/1wg_-AsMvSc3qrs7UTTRhj29jEk9maNNFTDlMhRKxfnM