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olamobile asked

Clarification on Assistants - When to use ESS or PV inverter assistant when grid is usually not available?

I am installing a AC / DC Coupled system with Quattro, Fronius Primo & AGM batteries, I fully understand the rules and how to go about sizing and installation, that has been completed. However, I am a bit un-cleared on the right assistant to use for the setup.

The installation is not off-grid but the utility supply is very erratic, may not be available at times in weeks, I fully understand that for a off grid system with AC coupled inverter, the PV assistant is recommended but since the utility power may be available at times (even though there may be very long outage) can this system be setup with ESS assistant even though the utility power may not be available most time.

Thanks for the guidance as I am thinking of setup as ESS, Is there any demerit in this system being setup as ESS?

@mvader @Johannes Boonstra @Guy Stewart @Matthias Lange - DE

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Alexandra answered ·

We are in a similar situation here. We are using ESS. When the grid goes down the Fronius is still frequency controlled as when there is grid. The disadvantage of the pv assistant is when you are connected to the grid the Fronius is idle. https://www.victronenergy.com/live/assistants:pv-inverter-support#summary_of_functionality. You do need to be careful with the generator input AC2 to prevent the Fronius from accidentally feeding back into it. We set the Generator to run at a higher frequency so the system throttles the Fronius. There are a few other tricks out there other assistants that can be addes so you don't necessarily need to use this solution

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olamobile avatar image olamobile commented ·

@Alexandra Thanks for your insight, just wanted to have experienced / expert users opinion if the Quattro will still be able to frequency control the Fronius, knowing that the grid frequency is fixed and will not affect the system. What does your setup looks like?

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