have some old bits lying around and if this is possible i will build a a system out if them. can i couple a Primo 5AU with a MutilPlus 3K?
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Have a read of this manual on AC coupling and its limitations:
Victron with AC PV online training
AC-coupling and the Factor 1.0 rule
AC-coupled PV with Fronius PV Inverters
Connecting a PV Inverter section of GX manual
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