Geyser is on with batteries on Keep charged.
Either modify the Victron drivers/scripts to suit your desires or you get used with the situation.
Victron will not consider this a problem.
It will ask you: is the system/MPPT supply all the needed power? Yes. Then no problem.
I’ve also rised this problem on the old community. Fall on deaf ears…
Ended up modifying the Venus OS scripts to do what I want and how I want.
I don’t know a lot about scripts.
If you switch off the grid does it ramp up? (With the load you show there)
No, it doesn’t.
I’ve told you that I’ve also risen this and no answer.
Then I’ve though about it and realized that things are a little more complicated…
Starting from the premises that you have a two identical strings, on the same direction and the same tilt, yes, indeed, the expectations are for the MPPTs to be balanced…
But the MPPTs have no idea how similar your strings are and neither how is their orientations.
Supposing that you have a 5 panels on one MPPT and 4 panels on the other MPPT. Or more extreme: 8 and 4.
How is your idea of balanced in this situation? A similar power value on both MPPTs or a 5/4 (8/4) ratio between them?
So you see, for this to happen, maybe somewhere there should be a description of the strings connected…
And this is a little counterproductive.
From what I saw, the MPPTs start from a certain point where they are in current/voltage limited mode and from time to time the algorithm pulses the MPPT to be in full mode up until the sum of the two are what is needed.
But this could lead to those imbalances…
Just some thoughts …
@Pretorius : can you confirm, you solved the original problem of the trackers capturing ~2.5kw each, but not at the same time, by replacing the 450/100 with another 450/100?
Also, can you confirm, what are “ESS #1” and “ESS #2” - are they pairs of US3000C?
It looks to me like the Cerbo thinks it needs to throttle back the MPPT total.
Places where that could happen;
- The battery pack is telling the Cerbo it doesn’t need much
- Although the battery pack needs charging, the Cerbo thinks that the batteries are already getting most of their power from somewhere else, and therefore limiting the solar from the MPPT.
- CCL is an obvious candidate.
- Temperature derating in the MPPT? I would think that both channels get derated equally, but maybe not.
Things you have already ruled out;
- Configuration in the MPPT limiting the current, such as derating the 100A down to say 30A - this is disproved by the fact that when one mppt drops off, the other picks up, but if the MPPT were limiting themselves this would not happen, they would stay limited to 30A.
- An array issue - again, this would always limit the production, not see-saw like it does.
The previous time that I struggled with the problem, it was solved with the new 450/100, yes. That said, there was no test done to check if the initial MPPT was indeed faulty. It was just one of the lot serial numbers that could be exchanged.
ESS #1, ESS #2 etc. is status codes and does not mean that there is pairs of batteries. I have one battery pack of 4. The code meanings is as follows:
- #1: SOC is low
- #2: BatteryLife is active
- #3: BMS disabled charging
- #4: BMS disabled discharge
- #5: Slow Charge in progress (part of BatteryLife, see above)
- #6: User configured a charge limit of zero.
- #7: User configured a discharge limit of zero.
At the moment I try lowering the battery SOC to 60% (so that it can still be charged by solar and not grid) to see if I can get the Cerbo to tell the MPPT to get a grip. I still don’t get the daily yield that I had before, but it seems a bit better that last week. Will what happen in the next days.