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Solar Installation Underlying Infrastructure

My solar quest is probably a little different to most. At this stage I just want to see the possibilities. I want to install an easy modular system starting small first. I want to know how much it would cost to install a 1kw solar system. The panels would be in an open paddock - the important thing is every year I just want to add more panels without changing the underlying infrasture. A three bay barn with electricity connection is approximately 20 metres away. This is connected to my house electrical supply located approx 50m away.