Countertop fridge can't handle the heat. Recommendations? refrigeration

I have a 2.0A fridge running off an inverter/marine battery setup for a farmer's market. In the 80+ weather with some unavoidable direct sun, the cream-containing cakes are starting to look a bit sad.

So, I've added what I think is the maximum reasonable number of batteries, and since the inverter isn't alarming, I doubt the supply is the issue.

SO. The main other unit I can find is a Turbo Air unit, which says it's 2.6A. Not that much higher - or is it? Would I expect a lot better performance from that? Does anyone have any better recommendations? It must have glass on all sides. Plus the door gets opened constantly, so the compressor is running constantly on these things.

Here's the current fridge: http://ift.tt/2uLiCeu

And the turbo air: http://ift.tt/2umNJuc

Submitted July 22, 2017 at 11:56PM by Dc_awyeah http://ift.tt/2uK1oyo refrigeration