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I beleive you are right. Its the variation thats the killer, not the level. A larger header hose would help but those are frowned upon.
We have spent 25 days in our 19 so far this summer. We have 320 watts of solar (theoretical max) in two fixed panels on the roof. We have an RMD 8555 fridge.
We travelled with the fridge on 12V (solar), including rest, lunch and gas stops. Throughout all that our fridge kept at 7C with three bars and 5C with four bars. The solar had no problem maintaining the fridge. Some days we would draw down the batteries a little and others we would maintain and even gain. We found its best to minimize fridge door open times. Ambient temps were from 11C to 30C.
Prior to trying the solar stress test we ran the fridge on propane and at elevations from seal level in Prince Rupert BC to 7600 ft at the kootenay skyway. We live at 3600 ft ASL. The propane never failed to light first time every time.
So all in all we are fairly happy with our fridge performance.
John
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