From: Luis Moreira <luis.moreira1575@googlemail.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Sun, 1 Aug 2021 03:42:10 -0700
Subject: Re: [EE]: Solar Micro Inverters
Thread-Topic: [EE]: Solar Micro Inverters
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Hi Guys,
Thank you for the info.
The app note has great info to keep me going for a while.
Another thing that intrigued me was the grid sync. Supposedly when
transitioning from stand alone to grid tied, the system needs to lock on to
the grid before it connects to it. The method that it uses is not the issue
for me, the thing is if it is working off grid powering some devices and
then needs to adjust the waveform to match the grid for connection, how do
they adjust it without damaging the devices? Is there some sort of rule on
this? This will have to be done by slightly change the frequency, I guess.
I will check the app note, it probably explains it.

Best Regards
           Luis

On Sun, 1 Aug 2021, 06:38 Jesse Lackey, <jsl-ml@celestialaudio.com> wrote:

> Microchip appnote for the win:
> <https://ww1.microchip.com/downloads/en/AppNotes/01444A.pdf>
> "Grid-Connected Solar Microinverter Reference Design"
>
> The TL;DR: it is complicated.
> J
>
>
> Luis Moreira wrote:
> > Hi all,
> > Long time since posting here.
> >
> > I started having a look at solar micro inverters and although I can
> > understand the principle of them and why you would use them, I'm failin=
g
> to
> > find more detailed info..
> >
> > Do you guys have any links for detailed descriptions for them that you
> > would like to share?
> >
> > My immediate questions are:
> >
> > - On the grid tied systems, are they all in effect connected in paralle=
l
> > and with the grid directly or is there some sort of "aggregator" in
> place?
> > - do they have a short term storage device like a battery/capacitor
> > internally for the intermediate DC/DC converter or does it have some so=
rt
> > of direct DC/DC/AC converter?
> > -  how does the sync circuit work? it probably needs to be faster than =
a
> > normal inverter circuit or the wasted energy while trying to lock would
> be
> > too high.
> >
> > Any diagrams and algorithms would be greatly appreciated.
> >
> > Thank you in advanced
> > Best Regards
> >                    Luis
> >
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