Not exactly your setup and I do run mine from the AC system but I use two of the Eva Dry Petite units and the little tray is always filled to the drain tube and the sinks are wet. They made a noticeable difference in my boat. Of course mine are used for winter humidity control but the problem is similar, humidity of 70-80+ % even with the colder area. It is raining like the dickens today so humidity should be around 100%.
I wonder if you simply didn't start out too small. Maybe a second unit of the same size or one larger unit.
Can you rig 120Vac for a test for a day or two and/or scrounge another unit from some one else.?
If two can handle it then maybe a single larger unit would actually not use twice the power.
Of course I realize the cost is mounting but you may not be far off but just enough that the single cannot do the job.
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