My Multiplus 3000 puts out a max of 66 to 70 amps in charger mode on generator even though my batteries are down 240 amps.
My battery bank is 630 amps - 12 v
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What is the actual battery Voltage at the point that you expect there to be more charge power?
Also check what the max charge current has been set to in the VE config program as this can be set to the Max that the battery bank is allowed to take by the installer,
VictronConnect VE.Bus charging manual
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