What does kWh stand for, and what's the difference between a kW and a kWh? Finn Peacock October 12, 2017 01:02 Updated Follow I explain that here. Related articles How do I know what size system is best for me? I've been told my maximum solar system size is 5kW. Is that correct? Should I buy batteries with my solar? Is my SMA inverter 3 phase or single phase? What price should I be paying for a solar system? Comments 0 comments Please sign in to leave a comment.