I have a 3-phase connection, and RS6000 connected to phase 1. While charging the battery by PV, the RS compensates the use of electricity on phase 2 and 3.
When I set Feed_In to Not Allowed, the RS does not compensate for usage on the other fases. In some cases this would be usefull; when the price is below zero, but taxes are not, or in case I want to stop paying for being able to sell back because the fixed costs are higher than the earnings.
So I expected 3 options here, which are technological already possible; Feed_In âAllowedâ, âNot Allowed, no ESSâ and âNot Allows, with ESSâ, or âNot Allowed, No compensationâ and âNot Allowed, with Compensationâ. Any name will do.
Am I overcomplicating my wishes, do I overlook an option or is this a missing feature?
In the Cerbo-GX I found the setting âESS max feed-in powerâ which is currently set to â-1â, no limits. This can be set to a positive number representing 100W units. Zero is not accepted. This would have solved my problem as well.
I want to use Home Assistant for running an automation to set âESS disable feed-inâ to âOnâ when âtoday_energy_current_hour_priceâ is below zero. If setting âESS max feed-in powerâ to zero will do the job, then I am happy as well of course.
I was able to change it to zero feed-in and the phases are still compensated. The solar connected to the Multi RS went into the battery. The other connected SMA Tripower wasnât reduced, so I changed it to 1% and the Multi RS was keeping the grid point around 0.
But when the battery was 100% the it was consuming around 100w / 180w from the grid. Grid setpoint set to 0.
That bug I noted was just related to Opportunity Loads failing to read that path. General Issues around feedin on the RS, iâm not aware of any with recent firmwares and venus.
If you disable feed-in, then how would it be able to compensate the other two phases?
To compensate what is being used on L2 and L3, there needs to be the same amount of power going back into the grid on L1. But thats what you forbid by disabling feed-in.
I guess what you are looking for is under ESS, grid setpoint. If that is set to 0W (while Feed-in is allowed) then the other two phases will be compensated for, and the net sum of power on the grid connection point will be (about) zero.
In the Netherlands, we are allowed to feed power back to the grid, but sometimes we want to avoid this when prices go negative or when itâs financially unviable. In those situations, we want to use the zero-feed-in function while still balancing the sum of all phases to around 0 watts. That way, we technically arenât consuming any grid power either, because the smart utility meter net-meters this across all three phasesâmeaning any excess power produced on phase 1 is immediately offset by the consumption on phases 2 and 3.
However, the setting you mentioned only works properly when we are actively consuming grid power and the battery is not full. When the battery hits 100%, the solar energy connected to the Multi RS does not throttle back like it should, causing unwanted feed-in anyway.
so the 2 options are at this moment with 1 RS on 3 phase grid connection:
With âFeed-inâ turned OFF: The MPPTs throttle back correctly, but phase compensation stops working.
With âFeed-inâ turned ON and the grid setpoint at 0W: The MPPTs do not throttle back, but the grid setpoint remains perfectly compensated at 0W across all phases, as long as the excess solar power can still be stored in the battery.
With âFeed-inâ turned OFF: The MPPTs throttle back correctly, but phase compensation stops working.
With âFeed-inâ turned ON and the grid setpoint at 0W: The MPPTs do not throttle back, but the grid setpoint remains perfectly compensated at 0W across all phases, as long as the excess solar power can still be stored in the battery. When the battery is full this is feed-in to the grid.
How does it behave if you enable âlimit system feed-inâ and then set this to 0W? Is this being respected and does it still compensate for the other phases then?
@dognose I think the issues mentioned above need to be fixed for the Multi RS before opportunity loads can work correctly. For example, if you start an opportunity load on L2 with feed-in disabled, I guess it will just consume power from the grid. I must admit, though, that I havenât tried out the opportunity loads function yet.
