ACOPOWER has different generations of solar fridges. The one of 2018 was called RA series and the newest model was called LiONCooler.  

The page for solar fridges is:  https://www.acopower.com/collections/solar-freezer?ref=AWxGQ0I3fomh 

After click and review the product page, we found they have a significant price difference. Then, what is the differences in details between those two generations? Please see below comparisons: 

Now you have clear idea which one is the one you want! ACOPOWER has both above 42 Quarts models in stock, place order: 

R40A:  https://www.acopower.com/collections/solar-freezer/products/hy-r40a?ref=AWxGQ0I3fomh 

X40A:  https://www.acopower.com/collections/solar-freezer/products/hy-x40a?ref=AWxGQ0I3fomh 

Edited by Lynn