Wattage Custom Laptop

[DavideB81]

HI everybody,
I'm planning to BUY a custom laptop online.

My main spec are :
i9-9900K
rtx 2070
32 GB ram 2666
1tb ssd
1tb ssd m.2
17" 1920*1080 display

MY QUESTION IS:
as the only option available is a 330W charger....
isn't that too low, to assure the amount of power needed by these components???

and moreover:

how can the laptop works with 82WH Battery ONLY and NO CABLE plugged?

.....I asked to the service, but they are sure it is everything fine.

....however I know that MSI, for example, supply their Titan Laptops Lines with double chargers (500+ watt Total) and in the sli configuration it has to be always plugged-in with cable, to full performance.

THANK YOU!