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paulcupine avatar image
paulcupine asked

Fronius on AC-in limitted with battery under 70% SoC

I have two MPii's 3kVA in a parallel setup with two Fronius inverters. I have a 2.5kW Galvo on the ACout of the Multi's and a 4.6kW Primo on the AC-in side. I also have DC coupled PV.

With the battery still under 70% SoC, the Primo's output is being cut back while the Galvo's is not. If I switch on "feed in excess AC coupled PV", the Primo ramps up to full output and the Multis ramp up charging to match so there is still no actual feed in happening.

Is this a bug or have I done something wrong with my setup? The behaviour I expect is that the Primo should only cut back if the battery is full or if the charge current limit is reached, neither of which is the case here.

Fronius
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matt1309 avatar image
matt1309 answered ·

Hi @Paulcupine

I'm not too familiar with fronius inverters but sounds like the frequency shifting is coming on too early for the Primo. What settings have you got within VEConfig in terms of the frequency shifting, and similarly if you set them in the Primo what are they on that?


(ie what have you got for your settings equivalent to 1.4 section 4 in this link AC-coupled PV with Fronius PV Inverters [Victron Energy] )

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paulcupine avatar image paulcupine commented ·
There can't be any frequency shifting going on because the grid is on.
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