PV inverter to Quattro AC input?

Q&A and troubleshooting
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1

Is it possible to connect a PV inverter to any of the 2 AC inputs of a Quattro?

The other AC input is for grid.

I don’t want to send PV excess to the grid.

TIA

2

Of course you can… But only at the AC connection where the grid is also connected.
Then it is a so-called AC In-side inverter BEFORE the Quattro.
BUT not at another AC In… If there is no grid available, the inverter will not start up… so it will not work…

3

The Quattro cannot connect both of its ac inputs at the same time.

If your PV inverter is modbus controlled (it may be possible to control it with the Victron) or has its own meter (and system to prevent feedback) feedback can be prevented

4

Thanks.

So, what if I use 2 Multiplus in parallel, one for grid input and the other for the PV AC input, both of them sharing batteries and load?

5

Also no.
The two inputs are usually regarded as one. The system cannot synchronise to two inputs. Same as the quattro.

We have ac pv on all our systems and they are grid connected with no feedback. It is possible to do it the regular way.

What ac pv are you wanting to use?
For those that don’t have control, you connect it to ac2 output and program the ac2 out relay like a generator that will switch it on and off

6

Thanks again.

I’m planning to use a fronius AC PV inverter.

So, following your advice, I’ll connect it the regular way.

Additionally I’d like to set the Quattro to limit the charge from grid just at night (low fares) and/or if the batteries are, for example, under 30%. How can I do this?

In this case, my only option for the AC PV is to connect it to AC-Out, right?

TIA

7

You have two options.

The Fronius is well documented

The zero feed in is part of the ess assistant.

How to set it up is described in the manual

ESS assistant also allows the battery discharge levels and settings.

8

Normally a PV inverter needs an active AC connection to synchronize and start, it will not start without that.
So if you connect it to the AC IN it will never produce any power.
It needs to be connected to the grid or the AC OUT.

9

Thanks Matthias!

10

Thanks for taking your time to grab that info. I appreciate that.

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