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Talking to SMA, during a 4248 Sunny Island installation, w/ AC coupled
Sunny Boys and a generator backup via transfer switch, I was told that
backfeed to the generator needed to be addressed. The Sunny Island
has a setting that will limit backfeed to the generator to a value that
can be set by the installer. The setup requires that a relay in the
transfer switch or generator close when the generator is on, to send a
signal to the Island. I was told that backfeed had to be set to
less than 100 watts.<br><br>
SMA tech support also reported that a number of generator control boards
have been fried by inverters back feeding generators. <br><br>
Drake <br><br>
At 08:28 PM 11/19/2008, you wrote:<br>
<blockquote type=cite class=cite cite=""><font size=2>In a message dated
11/19/2008 5:25:30 PM Pacific Standard Time, kelly@whidbeysunwind.com
writes:<br>
</font>
<dl>
<dd><font face="Courier New, Courier">I can imagine, if the inverter
tries to sync with the inverter, that the voltage could rise, causing the
inverter to disconnect, wait 5 minutes, repeat. Is there anything nasty
that could happen? <br><br>
</font>
</dl> <br>
<br>
Kelly, That is the way I see it. I have tested systems with gens and had
no issues. The Sunny Boy would not boot to a gen source. However,
you can understand what the official position must be. There exist
gensets with accuracy or it might just happen by chance. Low probability,
but not zero.<br>
<br>
Don Loweburg<br><br>
<br><br>
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Drake Chamberlin<br>
Athens Electric<br>
OH License 44810<br>
CO License 3773<br>
740-448-7328<br>
740-856-9648 </body>
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