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Maybe look up "Josh's house". Josh is a presenter on ABC Gardening Australia and local Perth resident who has set about building avery low energy footprint house. He recetnly installed a battery system and there was much fanfair about it, so there is probably good information available about what he used/did.
Me personally, we have our 5.2kw of panels being installed next week - grid connected so will receive 8c/kw for anything surplus. We don't have a fixed service charge in WA, so it's relatively common people have $0 power bills and get paid back money when they have grid connected panels.
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