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.
SMA tech support also reported that a number of generator control
boards have been fried by inverters back feeding generators.
Drake
At 08:28 PM 11/19/2008, you wrote:
In a message dated 11/19/2008 5:25:30 PM Pacific Standard Time,
[EMAIL PROTECTED] writes:
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?
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.
Don Loweburg
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Drake Chamberlin
Athens Electric
OH License 44810
CO License 3773
740-448-7328
740-856-9648
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