[RE-wrenches] Enphase "AC Frequency out of Range"

[Dave Palumbo]

Wrenchsters,

 

I have an Enphase 7.5kW system on a residence with utility Smart Metering,
both the PV Production Meter as well as the utility billing meter being
"read" every hour. This system has experienced many "AC Frequency Out Of
Range" events since the system was installed. Below is copied the Enphase
Event message. This particular event was for 5 minutes. Most of the events
(all events are AC Frequency Out Of Range) last 5 to 10 minutes but
occasionally they have lasted from 45 minutes to 64 minutes.

 

My question is: Could the use of the smart metering increase the likely hood
that AC Frequency events happen? Or is this just a coincidence and that we
are dealing with fluctuating utility power AC Frequency issues?

 

<< 

 

Started on: Mon February 04, 2013 12:49 PM EST

Cleared on: Mon February 04, 2013 12:54 PM EST 

 

Recommended action

 

This condition should correct itself. No action is required.

Details

 

The microinverter reports that the frequency coming from the utility is
either too low or too high as specified by applicable regional standards.

 

AC frequency is the frequency at which voltage varies on the utility grid.
Frequency Out of Range events are usually transient and self-correcting by
the utility.

 

When the microinverter detects an out of frequency condition, it must remain
offline until the utility has been within acceptable limits continuously for
a short period of time (seconds to minutes, varies by region). If during
that time the utility again exceeds or falls short of acceptable limits, the
five-minute timer must restart and the microinverter may not begin producing
power for an additional short period following the last out-of-bounds
condition.  >>

 

Best,

Dave

 

 

David Palumbo

Independent Power LLC 

462 Solar Way Drive

Hyde Park, VT 05655

www.independentpowerllc.com 

Vermont Solar Partner

25 Years Experience, (802) 888-7194 

 

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