You can refer to the current design: Solar Decathlon. . . According to the US Department of Energy, the website shows the cost of each shift.
The general design capacity is 8-9 kW, but it still cannot reach 10 rainy days that you mentioned, because it involves the size of the battery, which results in Electrical energy also needs to be effectively preserved before it can be used, right~
If the consumption is generally sufficient for home use: the cost will be around 30,000 US dollars, depending on the installation capacity and the brand you choose. There is still a certain price difference between solar panels of the same power.
The battery is enlarged and the storage battery is also enlarged. . . . And if the battery gets bigger, there won't be much space on the roof to place the battery panels, right?