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Want to run standby generator and still get solar output

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Posted by spaco on January 10, 2010, 11:42 pm
A friend just last month installed a 3kw solar pv no-battery system on a
net metering plan.  He had planned to feed his 6kw gasoline generator
into the house system via transfer switch in case of a utility failure.
But his electrician told him he can't do that if he also wants his solar
system operating because his generator puts out power that is "too dirty
or something".
   Is that true?  Why?

Pete Stanaitis

Posted by spaco on January 10, 2010, 11:58 pm
More to the point of my last post, for people who are off grid and that
have solar pv with back-up generator or supplemental generator, how do
they deal with the narrow frequency specs on pv inverter ac input>

Pete Stanaitis

spaco wrote:

Posted by ghio on January 11, 2010, 3:02 am
The usual is to use an automatic transfer switch so the house runs off
the inverter or generator. The transfer switch disconnecting the
inverter when the generator is running.

Posted by Bruce in alaska on January 11, 2010, 9:18 pm
 In article

Actually NO, what MOST Off Grid'ers use is a High End Inverter/Charger
that has a Backup Generator Input and does the connecting and syncing to
the Grid as well as allowing the Backup Genset to charge the batteries
when there isn't enough coming into them from the PV Charge Controller
to maintain Battery Charge. Like a Trace SW Series, or even a DR Series,
or any of the OutBack Power Inverters. Only a Cheap Assed Dufus, who
doesn't have a Clue, about the Technology, would come up with a Transfer
Switch between the Inverter, and a Backup Genset. Sounds like someone
doesn't understand how a Grid-Tied PV Systems with Batteries and Genset
Backup should be designed. Oh, Yea, and Gensets are NOT really "Dirty".
Some of the really cheap ones may not have good Governor Control, which
causes excessive Droop, but if one buys a Quality Backup Genset, It will
have enough governor control to stay well within the 58-62 Hz Range from
0% to 100% Rated Loading and +/- 10% of Rated Output Voltage spec's for
ANY of the above mentioned Inverter/Charger Systems. "Dirty" refers to
Waveform of the Genset Output, and Total Harmonic Distortion and Spikes
coming out on the Stator Windings of the Genset, and these just aren't a
problem for most (95%) of Home Power Systems, AND any computer with a
Switching Power Supply. Even a DR will run one of those with NO TROUBLE,
disspite what the SalesDroid tells you at the Store, while trying to
sell you a PowerStrip with Line Filtering, for $5US Extra.....

Bruce in alaska
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Posted by ghio on January 11, 2010, 10:10 pm
Ok, so you get a very fancy automatic transfer switch. In the end all
you have is still a system to prevent AC from the gen set destroying
your inverter.

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