Hi,
I’m having a problem with my EV Car charger drawing power from my battery during a scheduled charge between 02.00 - 05.00 when tariff is 6c per KW. How do i stop this from happening to ensure only the grid import is used?
How can i schedule my batteries to charge at the low tariff rate? I am currently in DESS Green mode with all setting and prices entered. I added a picture to sum up the charging habit of my system.
TIA,
Joe.
Easy first switch off DESS as I found it drawing from the grid outside of the cheap tariff window and just use ESS. Just rely on the schedule charging instead. If this is not a Victron EV charger simply monitor grid input after the charger, make the charger the first part of the installation. See vid for more clarification on a hardware level fix
A technical solution to handle this easy would be to put your EVCS on ACIN and configure the Inverter to only support loads on AC-OUT from battery.
If your whole house is connected to ACIN only, you could think about to install the Venus Large image, enable Node-Red and then write a quite simple flow to change that setting for your desired time. Then, energy supply for the whole household would come from grid during that time - but if you seek to drain 11kW you probably won’t mind if it’s gonna be 11.3 kW 
Or you could also use Node-Red to change the maximum inverter power down to 300 watt for that time, etc.
Other than that, there are things to come during 3.80 that will solve your issue as well.
I just tried to use node-red to disable feed in while charging, but there are clearly some systems fighting each other.
First I disabled DESS, then tried to use MultiPlus-II 24/3000/70-32 > ESS disable feedback flag phase, but after a few seconds, it goes back to discharging from the battery again.
Then I tried to use MultiPlus-II 24/3000/70-32 > ESS power setpoint phase L1 (W), so I could just but it also didn’t work, and kept discharging battery, because the char charges from 3 phases.
I could get the result I am looking for, but only by manually setting this
is there a way to set this from node-red?
-- EDIT –
I found it!
This adjusts the Grid setpoint while charging, with a deadband filter to avoid spamming the setting.
When the total power goes to zero, it should in theory also set the setpoint back to zero, but in case it doesn’t, there is also a trigger on the evcs status, so when it changes away from Charging (2), it sets the setpoint to zero too, again with a filter to prevent excess writes to the settings.
Did I forget to consider something in this logic?
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