Australia has around 3.7 million solar rooftop systems but only a small fraction of them, about 180,000, also have a battery. Electricity networks have been reducing the feed-in tariffs they pay solar owners in recent years and will soon start charging solar owners for feeding their excess solar into the grid during the day. But they'll pay owners to feed-in during the evening when demand for power is greater. Independent sustainable energy advisor, Norman Koslowski, from Sky High Energy Control, says the only way solar owners can deal with the changes is to buy a battery.

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