We put a 9.8kw system on our house 18 months ago. It took a few months to see a difference in the bill but then the savings was apparent. However, over the last 6 months I have noticed that my consumption is going up every month without any significant changes to what we run in the house. I just got my bill today and my usage for last month is 1,000 kwh more than what it was last year this time. Now the big tank wasnt running then but theres no way my tank is burning that much electricity a month....right? What have others with solar experienced?