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Smart BMS 12-100 low charge output

Hi I have a problem with a low charge output from Smart BMS 12-100 to Smart Lithium 160ah. My 100A engine alternator is connected to starter battery from where the charge goes to Smart BMS. I cannot get more than 28A in the beginning when the bank is 40% soc and it soon drops below 20A. Normal output is 15-18A when 70% soc. Changing the fuse bigger or fuse rating settings on Smart BMS doesn’t change the output at all (even though I change the fuse rating to 9A it gives 15 -18A output). Same results when I tested charging with the high output mains battery charger. Anyone else had similar problems with this setup?

BMS
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