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Blue Smart IP22 12V 30A Charger Output Current Lower Than Spec

Hi guys I have the above charger which should be able to output 30A, I am using it to charge a 100ah Lithium battery which has a max charge current of 100a, for some reason after about 15 mins of charging at 30a the victron charger is dropping to 19.2a for the remaining duration of the charge and I cannot seem to work out why, all my wiring is good (6wg) and I contacted the batter manufacturer who said the battery should take 100a up to about 90%. Can anyone shed light on this? Could it be the charger is getting too hot? Ambient temp was about 15 degrees at the last attempt.

chargerbluesmart ip22charge current limit
2 |3000

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