I had a 1.85Kw system and I added another 1.5Kw system. Turned out to be cheaper to have complete new system with its own inverter than extending the current system due to problems with matching panels and the cost of the larger inverter. The current system had 10 x 185W panels and the new system has 6 x 250W panels. This second system was installed last Christmas, so it has been accepted for the QLD 44c rebate. QLD now 8c. As I already had the rebate for the earlier system I only got recs at a 1 multiplier. Not sure what it means, but rebate was about$1000.00 and my cost was $3000.00.
Very happy with the performance of both systems, also easy to check if either is losing efficiency as there is a direct relationship between the two systems with regards power generation.
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