The average US residential annual electricity consumption is around 11 MWh or around 30kWh / day (11,000 kWh / 365 days) [1]. Assuming it produces 600kW for 24h or around 14MWh / day, this services around 480 homes (600 kWh * 24h / 30 (kWh / home)).

Their website explicitly says [2] (Overview 1.4):

> designed to transfer up to 600 kilowatts of electrical power—enough to power about 300 homes

[1] https://www.eia.gov/tools/faqs/faq.php?id=97&t=3

[2] https://makanipower.com/