question

Herve RV Nizard avatar image
Herve RV Nizard asked

Fronius + MULTI Ii AC Coupled ESS settings

img-20220621-153017.jpgI would be happy with some help. First time installing an AC coupled system with Victron + Fronius. Have difficulties finding the good ESS Assistant settings.

Fronius PV Inv Primo 4

Multi II 48/5000

simpliPhi ion lithium batteries (client's reqrt)

NO export to grid allowed


wish to find the best setting via ESS for solar / battery priority as follows :

- Solar to supply loads via Fronius

- Excess to recharge the batteries

when no sun or not enough :

1- use from battery via MII

2. If not enough, let Grid IN but without recharging batteries.


Have set mini grid on fronius with freq shift

1 to 1 rule respected

FRONIUS on AC out (loads)


Very familiar with VS / OFF grid / DC coupled settings in VeConfig . Not too familiar with Ess.

Have read most Victron docs . looked at Fronius/Victron webinars.....


Probably missing something.


For now Grid is charging batteries and suoplyung loads ....


Thanks for any tip or link ....

ESSFronius
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2 Answers
Matthias Lange - DE avatar image
Matthias Lange - DE answered ·

There are no special settings needed in the ESS assistant just say YES if it ask if there are PV inverters on AC Out.

For zero feed-in you need to change some settings in the Fronius:

https://www.victronenergy.com/live/ac_coupling:fronius

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Herve RV Nizard avatar image
Herve RV Nizard answered ·

Thanks. will double check again. so which assistants must be loaded ? Pv inverters only ? then set the ess via gx ?

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