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# Wednesday, 22 August 2012

Charting in PVoutput is done in javascript using

  • Ability to compare with similar systems within close proximity sllows short/long term performance issues to be identified
  • Can upload energy consumption data from home monitoring devices

Good view showing actual money earned by Feed In Tarrif (FIT) over months.

Monthly comparison of system against a similar 50km away.  High westerly winds today, and heavy showers with sunny spells, so High Hazliebank system worse, as weather probably better in the East.

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Firstly setup PVOutput, and turn on API.
This Java app runs as a windows service, and scans the Aurora Communicator log files every 10 mins, then uploads to  Logs are setup in Communicator, Data Logger, c:\Logs is the default for service.  I am writing to log file every 1 minute.

Conf settings, including PVOutput API key and number of  system, are in here.

Uses Tanukisoftware Java Service Wrapper under the hood to make Windows Service install to be easier.

Then we get updates every 10 minutes on the website.  Been a cloudy day with very heavy rain showers.  When sunshines it max’s out the inverter (3.3kW) which happened at 1pm.

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Found it was better getting historical CSV data using aurora monitor  Inverter, Retrieve Daily Energy.  I then got about 11 months of daily total data (which is the lifetime on the inverter so far).

Loading manually. CSV seemed easier.

For some reason aurora monitor didn’t get some of the earlier data, so used Communicator to get that data.

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# Tuesday, 21 August 2012

Prolific chipset USB-RS485 converter.  It didn’t work – loopback is giving nothing.

Some great technical advice on  and

Terminating resistor switch on right hand side is down (on).  Ground wire (green) is not needed I believe.

I ended up buying another one

Power-One Control Unit PVI-USB-RS485

Which uses a different chipset and worked first time. – good technical advice.

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2 sub arrays which feed independently into the inverter.


Power One PVI-3.0-OUTD-UK Inverter.  - 2 black cables at bottom are DC in.  Other cable in AC out.
Max output power 3.3kW 
Max Continuous Output Power 3kW at 55oC

Wired into mains.  Solar meter reads amount of power generated by inverter.  Left meter reads power coming into the house.  Left meter goes red when power is going out of the house – an error.  That meter can measure how much the house feeds onto the grid, but doesn’t appear to.

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