alex_pescaru

Communication is RS485 (differential communication) so no need for earth. Below the cable.

I suppose that many have, on a certain MPPT input, just a single string of panels. What about the situation when you have two strings of, let's say 5 panels, in parallel? Something like the configuration below: And only one (or two panels) from a string is shaded, lets say panel 3 (or 3 and 4), in schematic above ... Is it possible that the full exposed string to somehow "mask" the problem induced by the shaded panel(s) from the other string? How will be the MPPT's behavior in this case?

I am trying to understand things and therefore let's summarize some data. The following information were taken from the corresponding threads. Both "stuck at 90V" and "shadow management" mods are implemented in the same function, right? "Stuck at 90" mod From what I see, the main modification was to reduce the current limit (0.5A -> 0.05A) in order to not drop the MPPT voltage. And if the MPPT voltage was dropped, this was made slowly, with a constant value, up until a lower limit (different users choices) was reached. "Shadow management" mod The current limit was increased (0.5A -> 1.5A), somehow negating the "stuck at 90" mod above. The MPPT voltage is dropped all at once now, to a certain value, "restarting" the MPPT, if the current is below the limit for more than 10 minutes. Am I missing something? Can, therefore, consider that the "Shadow management" mod is superseding the "stuck at 90" mod, somehow also doing its job, but from a different angle? So, after a lot of experiences, you reached the conclusion that the best way to do it, for best results and for avoiding getting stuck, is to "restart" the MPPT, from a fixed value, if the current is below a certain value, for more than certain time, right?

Hello All, I am a newbie to MPPT algoritms so I have a question (go figure... 😀) I saw from the video(s) on this thread that the "resync" time with the new max power point, when light conditions change, is taking no more than 10-20 seconds... So, for simplicity sake, why wait for a certain minimum current or wait for a certain amount of time and not do a "forced mpp resync" once every say, 10 minutes? This means a maximum of 12 minutes lost during a 12 hours solar time. Am I talking nonsense? Thank you and be gentle with me... I am learning.