I mean, the material cost to this already far exceeding the actual goods, they are mispricing by a whole lot, something is not matching in this thing. It is also can be found on any store btw.

1000 power bank of 10k mah you can get:
39000wh = 39kwh

A household power consumption is:
877 kWh per month
Or
19.973kwh Energy Required per day

Basically you can power your entire house already with this renewable energy. But would cost you 20k myr to setup.