Hi! I tested some things with shaded modules,in my case MPPT works at 140-1000V.But during the day V drops below 100,but generation still continues and in some cases even grows.Is that how it's supposed to be? 

Dear ArtemVydysh,

Thank you for your inquiry.

Please send your project file (*.pvprj) to hotline@valentin-software.com so that we can take a closer look at it.

For some reason, my message is blocked, so I'll leave the file here. 

111.pvprj

I have sent the project, could you please take a look at it?

Dear ArtemVydsyh,

Thank you for your inquiry.

Unfortunately, your project file is unavailable. Please try to resend it (either here or to hotline@valentin-software.com). If the file is too big, please use WeTransfer or similar.

I sent the file to your e-mail

Dear ArtemVydysh,

Thank you for your inquiry.

If the MPPT voltage falls below 140 V, as in your example, the MPPT still controls the operating point at 140 V and generates a PV yield. This results in losses, which you can see in the energy balance. 

The PV yield can increase again if a more favourable operating point can be found.

I thought the MPPT would shut off, but instead it simply locks onto the last available point, if I understood you correctly. Thank you for your help.