I have 1540W and it's enough to cover more than 16hrs of power outages (light fridge, fans etc...), but I'm planning to expand as things are going wild in the n

I have 1540W and it's enough to cover more than 16hrs of power outages (light fridge, fans etc...), but I'm planning to expand as things are going wild in the near future probably. I'm afraid at the current rate of wars and energy insecurity even some rich countries will face the issues we're facing and we will be even worse!