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I have made something similar, but with more solar power 245w and 140ah of batteries. The difference is I am powering the sump pump directly via inverter to the sump pump all the time 24/7. You need to keep an eye on battery voltages as mine will drop down to 12.4v even on the rainy days. I would like to see battery voltages to be maintained at 12.7v or above. Our sump pump draws 560w every times it runs, which usually runs for a bout 7 seconds.I must of spent over $500 for everything on mine, and will be adding at least another 200w of panels shortly