This is an EVCS query.
I have a home battery ESS with PV. The configuration is as on the diagram, with the grid connected to ACin and all loads, etc on AC1 out. There is now an Victron EV charger on the load side.
Eskerfell ESS.pdf (69.9 KB)
Presently the PV is sufficient to power the house and charge the batteries with the surplus being exported to grid. It should be like this for the next 6 months. There is not sufficient surplus PV to recharge an EV in a day! I envisage numerous occassions when I will need to charge an EV overnight using cheaper electricity, but would want to continue to power the normal house loads from the battery.
I assume the Cerbo GX will be aware of the EV charging current, and so in theory should be able to limit the grid feedin to the set EV charging current. But I am unsure how to set it up to ensure that behaviour. Can anyone advise please?
The easiest way to achieve this is to connect your ev charger on the AC IN side and then select “Use battery: Critical loads only” in the ESS settings.
That way, when there is no solar, the evcharger would pull from grid, but still beeing able to use solar, while it is flowing from the ac in connection port towards the grid.
With the EVCS on the AC in side - is it still possible to use excess PV to charge an EV?
I am looking for the same, ability to charge EV with cheap overnight rate (scheduled mode) whilst not depleating batteries.
Also using excess PV to charge EV when I am home during the day (auto mode).
Many thanks
Yes, works.
If you have feedin enabled, it works implicit at any time. (Solar flowing to grid will be consumed by the EVCS)
If you have a meter and the EVCS connected between the meter and the multiplus it even works for zero-feedin systems, because then the multi will be able to detect the consumption on AC-IN and allow enough energy to be send to AC-IN to cover that load.
(Having a meter is also preferable when Feedin is allowed)
The only downside is, that you won’t be able to charge during grid loss - but that could be resolved with a transfer-switch, allowing you to move the EVCS to AC-Out when required.
But beside some apocaliptic end world szenarios, I would rather charge my EV public when grid is down and use the home-battery to power my home loads 
On ccgx go multiplus go advanced go redetect VE Bus systems and redetect