Hello,
I have a mulitplus II with a Cerbo GX and I live in France. I have an EDF Tempo contract so I activated the Dynamic ESS feature (with BatteryLife activated) in Green mode.
Unfortunately it doesn’t work as I expected. I did an analysis over the “red” days of January (see attached files) and among the 6 red days of January, I’ve been able to avoid using the grid during the costly hours only once ! While with the batteries I could have avoided completely that usage I think.
Here are the two problems I observed:
- During the night I would expect the system to charge fully the batteries, but usually it charges them a bit towards the end of the night, but not completely at all ! Consequence is that during the day there is not enough in the batteries and I have to consume from the grid. The only reason I see for the multiplus to not charge completely the batteries is if he thinks that he’ll have enough with let’s say 50% batteries + the solar production for the day. But as you will see in the files, we are far off ! As my consumption is fairly stable over the days, my only guess is that he is way overestimating the solar production. Unfortunately I don’t see how to access the production estimates in the past (to compare them with the actual). But I doubt it’s that because usually when I check towards the end of the day, the estimated production is close to the actual. Any idea ?
- It seems that often, instead of starting by using the batteries, he keeps the battery usage for the end of the day. Consequence is that if the PV production is higher than expected or if the consumption is lower than expected, we will consume grid while we could have used battery. The only explanation I see for this behavior is to “keep the batteries at a high level of charge as long as possible, while still aiming at the optimum in terms of cost”. I could understand this design choice, but can someone confirm me it’s a design choice ?
