I have a 2017 GreyHawk 29W and I recently purchased new group 27 AGM batteries from Sam’s Club. I, in the past, installed 2 other batteries on my rear bumper, making it a total of 3 batteries for my coach. I do a lot of dry camping and needed the extra capacity. Having said this, they work exceptionally well with my original converter. All an AGM battery basically is, is a wet cell that has all of the water and acid absorbed into the mats, so that there is no free liquid in the cells. As a result, the cells are sealed so that one does not have to add water, as needed in most regular wet cell units, and corrosion is minimized and almost non-existent. I’m sure there are some other specifications that come along with AGM batteries that I am not aware of, however, for an uncomplicated answer to this question, they work perfectly well with my converter. Hope this helps.
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