Do you already own the pump and inverter? Is it hooked up and working now? How do you charge the battery? How often do you have to charge?
It may not be the optimum design but why not keep the existing components and just add the solar panel and controller and maybe a timer before the inverter. Then replace the AC pump and inverter when they fail?
Use the money you save towards a bigger solar panel so you don't have to worry about wasting a little electricity.
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