Should I buy a second-hand solar system? Finn Peacock August 23, 2017 04:50 Updated Follow Nope - we explain why here. Related articles What price should I be paying for a solar system? Can renters benefit from solar? I've been told my maximum solar system size is 5kW. Is that correct? Are South Facing Panels Better in Townsville? I need to replace one or more panels on an existing solar system but the exact panel model is no longer available. Comments 0 comments Please sign in to leave a comment.