question

It's not a phenomenon, it is by design. The MPPT will briefly track the power point every 10 minutes.

We'd need to know more about your system to understand the behaviour you are seeing.

What other components do you have?

What is the PV voltage at these times?

Thanx for the fast replay.

Yes I know that the 10 minutes drops are the MPPT :-)
But the of drop to 3-4W after that is probably not normal.

My setup looks like this.

Victron 100/20 is connected to two 375W Q.Peak panels.

On the batteries site, there is a Lithium-ion S12 P40 batteries pack and a Hoymiles 300 inverter.

The System is running smoothly since months.

But sometimes when the cloud change rapidly, the charger of the 100/20 drops to 3-4W and gets stuck on this. Sometimes until the next 10 minute rhythm. Sometimes for hours.

The PV voltage at the moment is mostly high, around 80V. The application says no errors and the charger status is shown as “Bulk”.

I initially thought it was a defect or a misconfiguration.

But I found more and more users who have the same problem.

Here in the forum there is also a topic in the German area.

I don't look at the problem every day.

But today is another one of those days with partly rapidly changing cloud cover. So I took a look at the log files and look... the issue has once again cost me an hour of sunshine.

Is Victron as active manufacturer here in the forum?

When can I expect a fix for this issue?

I'll collect all the topics together
Here is one from the German Victron Forum.

https://community.victronenergy.com/questions/158791/de-smartsolar-10020-tracker-hangt-bei-wechselnder.html

next one:
https://www.akkudoktor.net/forum/migrated-forums-balkonsolar/victron-mppt-100-20-aussetzer/

also here:
https://github.com/helgeerbe/OpenDTU-OnBattery/discussions/513

My MPPT100/20 with Firmware 1.61 also has drop down, is this topic being addressed by Victron? will there be a solutio?

Hi @Peff,

Thanks for taking the time to collate those other reports, and apologies for taking so long to respond.

I have nothing else to report yet except to confirm that Victron has seen your post and it has our attention.

Regards,

Guy

Hi, this seems to be a similar issue to the one I had with my 100/20s. See the following link:

https://community.victronenergy.com/questions/181872/smartsolar-10020-drops-to-10w-intermittently-for-n.html

Victron are trialling a beta firmware which completely stopped the problem in my case. I'm not saying it's the same issue though but worth noting. I'm currently using firmware version vC1.63.

Hello,

I have the same problems with my 100/20 mppt and I want to test the beta firmware on my system as well. I have two 100/20 and two 150/35. The 100/20 drops out all the time. I attach just one time stamp out of the VRM. I’m not willing anymore to reset this with the Connect App - then the software start again to work normal.

The actual firmware in both 100/20 is the latest v1.61.

Regards Philipp

Please note that a beta firmware is available here:

https://community.victronenergy.com/questions/181872/smartsolar-10020-drops-to-10w-intermittently-for-n.html?childToView=272493#comment-272493