[amsat-bb] Solar panel inverters--radio noise? (optimizers)

[Burns Fisher]

Never thought of the diode bypass.  Of course that makes perfect sense!

On Mon, Feb 11, 2019 at 7:54 PM Robert Bruninga <bruninga at usna.edu> wrote:

> ➢ Bob, one person looking at my place quoted panels
> >  with optimizers going to a string inverter.  That does
> > not seem to make sense since the roof these panels
> > would be on is totally unshaded and all facing the same direction.
>
> Absolutely.  Yours is perfect for simple DC sting inverter.
>
> The optimizers are a disaster.  RF WISE!
>
> Also salesmen are Full of smoke and mirrors to convince people to pay more
> for all kinds of “benefits” of microinverters and optimizer, none of which
> pertain to a clear roof with good sky.
>
> The only thing you don’t get with a series string is fancy internet
> graphics
> showing you the actual output of each and every single panel…   But what
> they don’t say about why you need that kind of detail is because their
> optimizers and microinverters fail so much under the hot sun under the
> panels, that they need this diagnostic every time they come back out to
> “repair” their lousy system.   it is extremely rare that the panel that
> fails, because it is always the Optimizers or microinverters.
>
> Most people WITH Microninverters for several years have reported they have
> ALL had to be replaced over time.  Because they Just cannot survive the
> extremes under those panels.  A string inverter sits in the basement or in
> the shade near the ground and lasts forever…
>
> And if a salesman tries to tell you that microinverters or optimizers are
> better because a single cell shade in a string array will take out the
> whole
> panel or array, they simply do not understand a series circuit with every
> 10
> volt section of every panel bypassed with a diode!    Even an optimizer or
> microinverter is still connected to each panel, but each panel is still a
> string of three 10v segments.
>
> Each segment is bypassed by a bypass diode.  So a shade on a cell takes out
> ONE ten-volt section no matter what kind of system it is in.  This is true
> in a string array, in a microinverter panel and in an optimizer panel.
>
> I am probably being too exaggerating, and probably they have better quality
> microinverters, but they don’t really care about RFI because only one in
> every 500 complains (hams)...
>
> Bob, WB4APR
> Author:  http://aprs.org/Energy-Choices.html
>
> -------- original -------
> Subject: Re: [amsat-bb] Solar panel inverters--radio noise?
>
> Bob, one person looking at my place quoted panels with optimizers going to
> a
> string inverter.  That does not seem to make sense since the roof these
> panels would be on is totally unshaded and all facing the same direction.
> So I wonder if you can get a string inverter without the optimizer, given
> that my situation may be a bit unusual.
>
> Thanks again for all the info!  Looking forward to your book!
>
> 73
> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>