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I've been told by electrical friends that anything under a 3kw system is not worth it.
They have also told me that an average domestic installation can not exceed 10kw per phase.
So most residence that are on a single phase power supply can only have a max of 10kw Solar System.
Anyone with a 3 phase power supply can have up to 30kw Solar System.
As others have noted, make sure that what you get is upgradable. I've been told that most of the small kw cheap systems are at capacity. Any upgrade requires a complete new system.
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