Hi Fellow Wrenches,
Thanks for the insight that AMR systems could interfere with not
only data monitoring (previous thread) but also with the inverter
control function, too.
I have attempted to gain some insight into the AMR system the
local utility uses (Cellnet) but talking to the utility people,
they would have you believe this is privileged if not secret info.
When Ameren first implemented the system (reportedly the largest
AMR system in the nation) they advertized that they would know
within seven seconds that you were without power. That number has
been seriously revised upwards in the interim.
Anyone have any info about using/accessing the AMR info for the
customer to view?
As always, TIA for the collective wisdom,
Bill Loesch
Solar 1 - Saint Louis Solar
On 09-Oct-12 7:06 AM, Jeff Wongstrom wrote:
All,
The utility(Flathead Electric Co-op) has recently completed
automatic meter reading using a power line carrier for all co-op
members. I will give them a call to find out the type and
frequency of signaling. The state 104 has been occurring within
10 minutes of connecting to the grid. Perhaps the IG uses the
zero crossing and is confused by the meter reading signal.
I have talked with Fronius and it looks like they may send an
IG+ as an upgrade. Perhaps the IG+ does not get confused by
meter reading signals. Fingers crossed. If it does go into state
104 maybe opening up the frequency window will help.
We have no other inverters on this utility for comparison
and have had no feedback on the hand full of grid-tied systems
out there.
Thanks for the valuable input,
Jeff
Jeff Wongstrom
NABCEP
Certified
406.291.3416
On Oct 8, 2012, at 7:38 PM, Kent Osterberg wrote:
Jeff,
Is there any chance the utility has recently
implemented a remote meter reading system? The Aclara
TWACs remote meter reading system communicates
by putting a pulse on the line that is very near the
zero crossing of the voltage waveform. Unfortunately
the zero crossing is easily and often used as a
reference point for frequency measurements. Devices
that watch the zero crossings are often confused by
the TWACS signal. The signal isn't there constantly --
only when the local kWr meter has been asked to send
data.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 541-568-4882
On 10/8/2012 9:34 AM, Jeff Wongstrom wrote:
Hello wrenches,
We have a Fronius IG3000 that chronically and
frequently cycles into and out of a state 104(grid
frequency not within admissible range). The
utility has monitored the supply and claims to have
found no frequency or supply issues. Fronius sent
a replacement inverter but the error persists. The
tie in point was moved from the critical loads sub
panel to the main distribution panel. The state 104
persists with ALL other breakers open. A Fluke DMM
min/max function captures no frequency readings
outside of the inverter frequency window-same with
voltage readings.
Any suggestions or recommendations?
Thanks,
Jeff
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