question

Thanks and kind regards from Munich!

DayAndNight!

Hello Vicronauts!

Meanwhile I have installed for 3-phase Grid-connected PV inverters from AE-Conversion the above discussed AC-sensors CSE000100000 to my Multiplus-II ESS-system. I wanted to share my experience and some informations and facts what I found out during the installation and setup process. Perhaps it will be helpfully for somebody else.

I couldn't find anywhere the dimensions of this AC-sensor. They are about 90 x 60 x 60 mm (L x W x D). I needed this in the beginning for thinking where and how to fix them. Finally I decided to use a polycarbonate box I knew already from mounting the megafuses.

Those boxes aren't very expensive, but very stable and it is easy to drill holes for cables. For the AC-sensors there is no need for a transparent cover but I like to have some view to my equipment, so this was reason enough to use a transparent cover.

I mounted this box directly below my distribution box so it was not very complicated to get the three phase wires of the PV system and pass them thru the ac-sensors and back to the distribution box. You shouldn't forget to set the DIP-switches on the AC-sensor to the right power level of each single phase of your PV-system.

Wiring sensor cables! AUX1 or AUX2?

The output sensor cables I connected first to the AUX 1 Input port each of the three sensors to the corresponding Multiplus-II and thought this was a good idea.

But as AUX1 is blocked and can be used in Germany for a GRID-based Feed-In signal from the Grid-provider it blocks later discharging ESS when AC-sensors are connected to AUX1. Located in Germany, it happend exactly to me and I found with some research the explanation and solution in Q&A - Q9 - fourthly of the ESS documentation:

"... Fourthly, feed-in may be disabled when a grid code (like the German or Australian grid code) uses the aux1 input to disable feed-in, and aux1-in is used by something else (like an AC-sensor or a BMS), this way feed-in can be disabled. Simply un-check the option in the grid-code settings to prevent this."

But it isn't so easy as described in Q&A -Q9 just to un-check the option, because you need for doing this the GRID-Password or you reopen the Multipuls covers and rewire them all to AUX 2

After doing the wiring it is necessary to install the AC-Current assistant.

VE-Config AC Current Sensor

Here the screenshots of this assistant.

Keep in mind what is mentioned here at: Reactive current correction - it showed me the first night after installing the sensors that this PV system is working with moonlight, too ... ;-) but after 24 hours this effect was gone. Exactly as described here above.

As I said above, specially in Germany it is better to use AUX-2.

Of course you should select in the following screen the corresponding setting as you did with the DIP-switches at the sensors.

In this system the PV inverters are connected directly to the grid which is wired to AC input 1.

And don't forget in a 3-phase system you have to install the assistant with ve-config for each of the three Multiplus-II.

That's it! When you look the next time to your remote console you will find the yellow square for the PV Inverter

and as well in VRM portal the data of your PV inverters

I wish success and fun with your Victron ESS system.

DayAndNight