Just watched your solar install video... very interesting.
I wonder why the installer didn't adjust the height of the rails on the brackets to offset the "undulating" roof structure. I know in the end it doesn't really matter... but the brackets have elongated holes, why not use them to make the rails straight?
I have 3.04 kW (16 x 190W) of ET panels and a SMA SB5000TL-20 inverter. My system was registered with the South Australian distribution company (SA Power Networks) as a 4.94 kW system, I can add another 10 x 190W panels without losing my feed in tariff... IIRC 44c/kWh from the governemnt FIT scheme and 6c/kWh from my energy retailer.
I use software called PV Bean Counter to read solar info from the inverter, this then uploads to www.pvoutput.org
in five minute intervals.http://www.pvoutput.org/intraday.jsp?id=5514&sid=5863
The next step is to transfer the Bluetooth read and upload functions to a Raspberry Pi and eliminate the need to keep a power hungry PC running!