I have some experience with solar power as I have a greenhouse that is powered by 2 1000 W Kyocera panels. The trick with solar is to skip the invertor & use 12V or 24 V DC loads if possible, this is my plan. I think I will avoid the batteries as well & simply use a load controller to start the pump when the amps will turn it. In my view this will work when needed, on the hot sunny days. My pond is so lightly stocked right now that I will wait until next year before I do anything.