I'm not following the calculations, maybe I'm sleepy. "can power a two-bedroom home for a full day". They say that is 20kWh (it doesn't change when you say sock

I'm not following the calculations, maybe I'm sleepy. "can power a two-bedroom home for a full day". They say that is 20kWh (it doesn't change when you say sockets vs entire home...). They say the battery is 14kWh and only recommend one. Huh?