What kind/brand of device would it be ?

[Externet]

Hi.
A camper with three 40V 10A 400W each solar panels in series totaling 1200W, 120VDC; and batteries.

What single device in the market to implement will charge the batteries and provide 120VAC up to 2KW during daylight and invert the batteries into 120VAC up to 2KW at night ?

 

[sunshine_eggo]

All-in-one inverter/solar charger:

HYBRID LV2424 – 24V 2.4kW, 120V Output, 2kW Solar Input 80A Mppt (Grid Feedback Optional) – Watts247 Wholesale

watts247.com

 

[Rednecktek]

There are similar devices from other companies like Growatt and Temank, but yeah, you're looking for an All-In-One unit.