As it looks like an off grid connection. You need to connect all the panels in parallel using branch connectors and ensure that the final panel output Voltage is 24V. Do not worry about the current. The charge controller will handle it. According to your load of 500W you need at least 3 solar panels of 265 W or any other combination of solar panels providing a generation round about 1000W, for this purpose you need an inverter of 1.2 KW at least. For backup, you need at least 2 dry gell batteries of 100 AH, it will give you a backup of almost 4 hours in case of fully charged.
