[Kon5ole]

The basic idea is to produce enough power when the sun shines to last when it doesn't shine, by using some kind of energy storage. Batteries are one option.

How long batteries last is controlled entirely by how long you want them to last. A 2 hour installation is made to last 2 hours, if you attach it to half as many consumers it will last 4 hours, if you double the size as well it will last 8 hours. Some modern EV's can power a single home for several days.

Another interesting option is to synthesize gas. Australia could for example power Sydney from solar+batteries+synthesized gas by the end of this decade if they wanted to, construction could start tomorrow.

It seems that worldwide, the main obstacle really is "Wanting to". Everybody says they want to but there are so many economic structures closely tied to the status quo that actual change is quite slow.