Choosing an inverter should start with your real load, not only the size printed on a product box.
List the appliances you want to run at the same time and note their wattage. Add the running loads together, then allow headroom for starting surges from appliances such as refrigerators, freezers, pumps and some air conditioners.
Battery capacity matters just as much as inverter size. A larger inverter connected to an undersized battery bank can still give poor backup performance.
Solar panel capacity and charge-controller limits should also be considered as one complete system.
DORAMCO can help you review your loads and recommend a practical starting configuration before purchase or installation.