Different types of loads have different starting impulse currents. Customers need to select the appropriate inverter model according to the actual equipment power, current, and load characteristics.
Please know that load is divided into resistive load and inductive load .If you need the inverter to run the resistive load (like laptop, TV, electric cooker ), please choose the inverter with continuous power higher than the appliance's rated power. And it is best to use 80% of the rated power. If you use microwaves, water pumps, air conditioners and other appliances with motors or compressors ,please choose the inverter whose continuous power is 3-10 times higher than your appliances.
Calculate and sum up your total loads in Watts.
Give room or plan for expansion,like if your total loads is 2000Watts, go for 2.5kw or 3kw inverter mostly 24V(2 battery system).
Since your total load is 2000watts, check to know the available wattage of solar panels. Say for example that what is obtainable in your local market is 250 watts/pcs, divide your total loads demand (2000Watts) by the available solar panel(250watts). This will give you the number of solar panels you need to keep your loads running, which 8pieces of 250 watts solar panel.may be you can connect 9-10,let it have a room for expansion,Then select the appropriate inverter.