Ac Coupling inverter + micro inverter

DIY
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1

Hello

I would like add a VICTRON multiplus ii to my system in order to have backup power. Actually I have 10 x 455W solar panels in South orientation with a Fronius Primo 4.6 and 2 x 550W solar panels in west orientation with a APSystems DS3-H 960W.

According with technical spec inverter and micro iverter support AC coupling but I don´t know if the Frequency Shifting mode works only with the fronius and the DS3-H whit frecuecy increment shut off, or both works well Frequency Shifting mode or the Frequency Shifting mode not work with 2 diferent inverter

My total solar power are 5560W ( I will never achive due panels orientation) I comply the 1:1 rule?

What battery capacity do I need?

Thanks for your atention

Regards

2

easiest way to do this would be to wire the fronius inverter on the AC out, and the micro inverters on the AC in. That way, you need only a 5kW inverter, not a 10kW(6kW as 2x3kW in parallel) to comply with the 1:1 rule.
Battery sizing depends on the inverter voltage (typ 48 - 52V) and the battery type. More information on that can be found at : Battery Compatibility [Victron Energy]

3

Hello

Lots of thanks Mike.

Regards