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I’ve had a 6.6kW solar system installed through Sunpac Solar for over 2 years now, and have saved us over $2000 in power bills so far. We have a Fronius Primo 5.0-1 inverter, and 21x 315w Seraphim panels (SRP-315-BMB). I waited this long only to provide a long-term review because that was the hardest thing to find even back then.