question

Hi Epi. The 100/ is a hardware limit. There *may* be protection from exceeding it on some models? But Victron specifically warn against it, as do all cc makers. It can be expected to damage the unit.

I think you're suggesting that this may never be reached in practice, but there's several ways this might occur:

* Disconnect or failure of the batts or wiring. Panel Voc goes to max.

* Li batt bms halts charging. Panel Voc goes to max.

* Batt charge tapers when almost full. Panel approaches Voc. Etc..

Panel Voc is specced at a standard temp (maybe 20 or 25C). Apply the temp coefficient for freezing weather and you'll soon see why 'freeboard' is recommended and applied.

Victron's mppt range is quite massive: https://www.victronenergy.com/upload/documents/Datasheet-BlueSolar-and-SmartSolar-charge-controller-overview-EN.pdf Good reason for them all to exist, like 48V batts and larger panel arrays.

But the question you ask is valid. Sometimes we all need a little protection from our stuffups, well I do! :) Nor am I particularly famous for following 'rulez'. In this case, I comply unreservedly.

thanks .... I wonder if anyone knows?

I have used mppt 100/30 for several years with panels fixed on RV roof with fixed wiring to mppt and battery.

I'm in process of adding a couple of portable panels which obviously at some stage will be connected to the additional regulator while the sun is shining.

I don't expect to be anywhere near the regulator spec - more headroom than with my fixed install.

But it has caused me to wonder about the fixed install. I shaded those during original install.

So, is the answer "yes" or "no".

thanks,

its a simple question about the mppt algorithm not a question about the operation of the panel.

Does the mppt algorithm limit its search range to <= 100V?

I understand the panel voltage the circuit sees may not be what we measure and the panel may behave beyond normally accepted limits. My panels have operated in a variety of conditions in 34 countries.