The 100% renewable energy storage problem is quite vast though, and the scale of the challenges involved are often downplayed quite strongly.
I've noted many of the numbers quoted for the energy storage required assume 2-3 days, or maybe a week. You can definitely assume some renewable capacity will still be online during a reduction in generation (maybe a large bushfire reduces your solar output significantly), so you don't need enough storage to cover all power consumption... but you still need a lot. And you definitely need to plan for longer periods of time, in the several week range, for emergencies, because a country running out of power in the middle of winter is Bad(tm).
The volume of storage required is immense for somewhere like Germany (500 TWh/year consumption, so 1.3-1.6 TWh/day average, depending on season, and you'd need storage for at least half of that). The volume of ammonia (or hydrogen or compressed air) required would be immense. Building dams for water-based storage sounds relatively easy but, ignoring the ecological impacts and actually finding suitable sites, you'd also need to build and maintain enough hydroelectric power plants to turn that storage back into energy (assuming existing hydro plants are still operating).
Batteries are cool as supplemental and for stabilising the grid, but not practical as primary storage. That battery in South Australia can store 194 MWh and supply 150 MW (i.e. it's empty in 78 minutes at full power). Australia consumes 190 TWh of electricity per year, so 520 GWh/day (naive averaging). To supply half of Australia's energy requirements (with naive averages 260 GWh/day at approx 11 GW) via batteries for one day would require another 1,760 batteries of similar scale (since each can only supply 150 MW of power for a bit over an hour); at the original price for the initial 100 MW battery (90 million AUD), that'd be 240 billion AUD. For 21 days of half power it'd cost 5 trillion AUD. And you probably don't want to fully discharge or charge the batteries, to reduce the replacement time, so might need 20% more than that -- and this assumes only half of the daily energy requirements. And ignores the mining capacity of raw materials.
You also need to be able to replenish that energy store in a reasonable period of time, to deal with fluctuating circumstances, so you need to build notably higher total energy generation than your average demand. If you had a 100% efficient storage mechanism, you'd probably need at least 10-20% over-capacity. If your storage efficiency is down at 55%, you'd need a lot more. If you have large amounts of solar, you'd have to have enough capacity to generate that surplus during the available daylight.
It's a problem worth focusing on addressing... but man, it's quite hard. Nuclear build times are long, but they may need to be included in more net zero by 2050 plans -- to reduce the total volume of energy storage required as economies grow.