I’m running my 3-phase D-ESS system (3* MultiPlus II 48/5000/70 and 1* MPPT 450/200) in green-mode.
I’ve a Node Red flow by which I would like to be able to stop feeding in excess PV-power by my own criteria. E.g. by high equipment room temperature.
For this I used the ‘ESS Contol Node’ in my flow and the ‘Feed excess DC-coupled PV into grid’ parameter.
The only the corresponding slider in the Cerbo GX (Settings > System Setup > ESS > Grid feed-in > DC-coupled PV - feed in excess) is switched to On or Off, but power is still feeded into the grid.
The Cerbo GX runs on beta Venus OS v3.70~2. But the same happend on V3.60 and their beta-versions.
Am I missing something or am I taking the wrong approach?
Or is this behavior by design due the the Green-mode setting?
When you have DESS enabled, there is an option “Can you sell energy back to the grid?” - Currently, that value will take precedence, so as long as you tell DESS, that Feedin is allowed, DESS will also Feedin.
We had some discussion internally, whether DESS should be able to override the local settings, and we came to the conclusion, that we will change the system behaviour here, so that - if two settings collide - the more restrictive one will take precedence.
This Change will be introduced in one of the next betas.
Until then, you could:
Use the vrm api to restrict feedin while DESS is enabled by targeting “that” value.
Turn off DESS using Nodered, while you want the ESS feedin settings to apply.
Thanks for the feedback. I was also thinking about those two options.
Because I was not sure about the impact of temporarily switching-off DESS I didn’t try that one.
I performed some tests with with the ESS feedin settings and they worked so that could be a temporarily solution for now.
I’m looking forward to the beta version holding the proposed behavior of the ’ Feed Excess’ sliders.
Maybe more difficult to solve but if possible:
disable functions which can’t be used due to other dependencies/restrictions.