So Dan, what happens when you have a solar system that feeds into
the net. Right now when the power goes out the solar setup stops
putting out power (no 60cps signal seen) so that anyone working
on the net is safe. So what happens if the power goes out and the
generator comes on after the transfer switch is thrown. Now the
solar setup sees the 60cps on the wires (supposing it's on the
generator/house side of the switch) and starts working again.
Will the power output by the solar system be used first (my guess
is yes) and then if needed the generator ramps up from idle or
will the generator see the power from the solar and try to shut
off completely. Also If the solar setup puts out more power then
is being used what happens to the extra power?
Confused yet? I sure am.
Manfred
Dan Penoff via Mercedes wrote:
To address the replies:
Single phase versus three phase causes a derate of the the alternator when
connected for single phase due to decreased efficiency of the windings because
you’re not using all of them, you’re only using 2/3s of them. That’s why you
have to derate a three phase alternator by 1/3 of its three phase rating when
connected in single phase configuration. If you attempt to pull the full three
phase nameplate rating out of the alternator when connected for single phase
operation it will either overheat or the engine will stall.
Fuel consumption for a 4B Cummins on a 25kW generator set is relatively low.
Consumption will range from 1 gallon per hour at 1/4 load to a little over 2
gallons per hour under full (100%) load. A typical house won’t pull 10kW for
the most part, but that extra capacity will allow you to do things you can’t if
you’re relying on a small portable unit, like run your AC, clothes dryer or
electric oven/range.
A typical setup involves a standby generator and an automatic transfer switch
or ATS. The ATS is rated for the service entrance capacity (200 amps for most
homes) and will contain the controls that sense the presence or lack thereof
utility power, command the generator to start, and switch over to the generator
after it has reached operating voltage and frequency. From the outage to
providing power to the house you’re looking at 10 seconds or less.
When utility power returns, the ATS continues to keep the house on the
generator for a preset period of time, usually around 10 minutes, to allow the
utility to stabilize and prevent retransfers if the utility drops out again.
Once that time has expired, the ATS switches back to utility power and the
generator runs for a short cool down period, usually five minutes. At any time
during this sequence should utility power fail the ATS will immediately
retransfer to the generator and the sequence starts over.
-D
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