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Your converter is probably a three stage one. So, the first 80% is bulk charge using the full 55 amps. When at 80% of the charge it switches to an absorption mode which takes 3 to four hours to charge the batteries fully. This is necessary for deep cycle batteries as it extends battery life. Your alternator is rated at 175 amps (Ford engine) but probably only puts out 150 amps. While it does fast charge the house batteries, it does shorten their life. Deep cycle batteries should be charged at a max of 10 to 13% of the amp-hour rating. More current lessens battery life.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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