> given two days' sun… [the device] will store sufficient electrical energy to light an ordinary house for a week. Obviously this was for 1909's power consumpt

> given two days' sun… [the device] will store sufficient electrical energy to light an ordinary house for a week. Obviously this was for 1909's power consumption. But imagine having the constraint of "The average household has x square feet of solar generation capabilities" when creating an electrical appliance. The manufacturers of the appliances would've had to care a lot more about energy efficiency, bragging about it as a feature of the newest model, instead of taking for granted that electricity would be cheap and plentiful...