Which power cable is suitable for parking lot lights and socket?

Question: Suppose there are lamps and other stuff on the supply line with maybe 200-300 watts. Then a pressure washer with a rated power of 3000 watts is connected to the socket. Total approx. 3300 watts. If I now calculate: 230V * 16A = 3680 watts (maximum). Would 3x1.5mm still be sufficient? (We have laid out rolled-up underground cable 3x1.5mm). Length approx. 30m?

rolled up no, laid out long yes

we took the thicker one as a precaution

Hi, I would definitely take at least 5 x 2.5. The price difference is not that big now. Regards Olli

Connection load 3000 watts. Total about 3300 watts.
If I calculate now: 230V * 16A = 3680 watts (maximum). Would 3x1.5mm still be sufficient? (We have rolled out earth cable 3x1.5mm). Length about 30m?

No, that is no longer sufficient. For the length and the connection value, you need 2.5 mm².

rolled up no, laid out long yes

Laid out long also no. 2.5mm2 is correct.