Solar panels

[Dave_McNaughton]

Finished my install of my solar panels to run my fridge when I'm off grid. And easy to remove if I want to use cross bars for some thing else

 

[irish44j]

I've been considering similar, but what's the advantage here of panels rather than just having, say, a 500W Jackery to run the fridge at night and just run the fridge off alternator/main battery power during the day? Just less load on the alternator?