Directly from Reddit that may be of interest to some.
Total Run Time on a RIVER 2 Pro powering a ARB 50 QT Fridge was 78 Hours (3.25 Days)
Incremental results: 24 hr. (1 Day) = 69%. 48 hr. (2 Days) = 37%, 72 hr. (3 Days) = 6%
The RIVER 2 Pro is brand new and was charged on AC to 100%
ARB Fridge Freezer Series II 50 Quart # 10801472 (about a year old)
The ARB was not precooled as we normally do and was empty so there was nothing helping it maintain temperature.
Plugged it the River 2 Pro's DC port.
ARB was set to 35 Degrees (F) and was opened just a couple of times.
ARB has a ARB Insulated Cover
When the compressor was running it consumed about 50 Watts.
Outside temperatures were mild 60-75 degrees (F)
The test ended when the RIVER 2 Pro was showing 1% remaining but by then the ARB got up to 50 degrees (F). I was hoping for 2 full days so overall very pleased with the results and ease of use. I assume that if the fridge was filled and was precooled the numbers would have been a bit better. I do plan on solar in the future but good to go as is right now