The following is a calculator designed to provide a rough approximation of the system components needed for an off-grid PV system. It requires you to input your individual AC and/or DC loads, the solar irradiation at your location, and a few module and battery parameters. The output data will give you an estimate for how many PV modules and batteries are needed, as well as minimum inverter and charge controller sizes required. See the help page for more information.
Note that the results on this page are generalizations and do not take into account shading effects, available space for modules, and wire and circuit breaker size requirements.