PV panels are cheap;
What's "cheap"? I look around and see they are about £1/W, which I wouldn't class as 'cheap', particularly why you need to add inverters and what not.
Look at the context. In the context of "install 150Wp PV system",
more panels are cheap, because installation costs, inverters etc. dominate the cost. There is also this difference that a too small of a PV system is still quite expensive and cannot run the fridge. A larger system is a lot cheaper per Watt, and will actually work, so inifinitely better than too small of a system.
Price of electricity is going sharply up, faster than PV system prices, so it's actually possible to make money on PV, now. So it's a really good idea to get a larger PV system in one go, instead of spending still relatively lot of money on a tiny system supposed to only run a fridge.
For example, I'm now selling to grid for around €0.20 on average, which is +300% increase in just a year or so. And the global energy crisis is real, it won't suddenly just go away.