Shouldn’t that be GWh?
No, grid connections are measured in GW.
Anyway, that’s peanuts if you want to rely purely on renewables.
These batteries usually are planned to have two hours of storage. Some more some less. So 158GWh would be enough to power Germany through sunny, but windless days. 1440GWh are more then a days worth of electricity consumption of Germany. Again there are no days with absolutely no wind and solar and Germany needs more of them to even charge those batteries up anyway. So it is on the lower end of what is needed to run a country like Germany without fossil fuels.
At that point you can talk about some weird forms of storage like hydrogen or use a bit of biomass or something like that. You might even get away with carbon capture and storage, because the amount of fossil fuels needed for that grid are so low.