yes, play on words....10 KWhrs is 10000 watts for one hour or 1000 watts for 10 hrs, and 500 watts for 20 hrs....but if were stacked then they could offer a nice package, say 30 Kwhrs for the same price as the present 10 KWhrs....solar cells to recharge 10 KWhrs within 8 hrs would be costly....beyond practicality...
But as a load reducer for the main utilities, they would would work nicely, picking up the household load in the evening, and recharging in the off hours