More ghosts 👻 than parts at the NETA distributtion center.
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Shopee, but I just checked, the vendor is sold out.
Check with @UWEB, he is running 2 x 10 kW DEYE inverters, although 3-phase, and did charge his EV at 8 kW for 12 hours straight.
Do you plan to use smart load?
1/2" is fine on the discharge side of the pump.
Select a pump around 250 W, they also have the 1" suction/discharge connection that you want.
https://www.mitsubishi-kyw.co.th/Product/For-Home/Water-Pump.aspx