It depends greatly on your setup but, unless you are running some crazy, completely off-grid, system with cheap batteries and cheap inverter, you can expect an

It depends greatly on your setup but, unless you are running some crazy, completely off-grid, system with cheap batteries and cheap inverter, you can expect an inverter to last you longer than this. Most are rated for 10-15 years, with some rated for 25 year lifecycle. As with many things, quality costs, but not all costly inverters are quality, so do your research before you buy.