Phil and others,As an update to an issue with a Fronius IG inverter and a chronic State 104 Grid Frequency error, swapping out to a Fronius IG+ solved the problem. Thanks for your help,Jeff
Jeff WongstromNABCEP Certified PV InstallerLicensed MT Residential
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
Kent,I just talked with Mike in the meter department. The utility does indeed use Aclara TWACs AMR. The meter reading signal can vary but is usually done at midnight or it could be set to every 8 hours, 1 hour, etc. However, a time sync signal is sent every 15 minutes. This correlates with the
Jeff,
The TWACs signal is a nasty beast. It is low frequency and thus very
hard to filter. It seems to cause problems with a large variety of devices.
Unless someone has taken the time to check, how do they know if the
other inverters aren't offline for 5 of every 15 minutes?
I think the
Jeff-
See if you can find a PowerSight power meter (http://www.powersight.com/;
in PGE territory, we can borrow them from PGE for free). This will allow
you to log and chart frequency. Present your data to Fronius, and assuming
that your grid frequency is actually within permissible range, push
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.
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