I assume that you mean you have a 5kW inverter and panels. Just because it *can* produce 5kW doesn't mean that it will all the time - it ramps up to the peak and then back down again. You'd need to know how much your house is drawing at the time as well as how much the system is generating.
Power = Volts x Amps, so 5000W = 240 x Amps. therefore 5000W = 20.8A.
Assuming you have a normal house and nothing much else is drawing power then you are probably using around 5-600W constantly with standby currents, wifi routers etc so about 18-19A would be the max around peak generating time.
If you don't have it already, get a system to monitor and log the output from your solar system and you will get a better idea of how it generates power. This is a pic of the output from my 3.3kW system today.
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