The May, 2013 results.
A little early since I won't be here for a reading on the 31st. No fancy interfaces or history recall here. It's the Amish version of PV solar. :laughing: Actually, for a simple system like this, all that isn't really necessary.
Above the model this month. The first half of May was one great solar day after another, not so much lately. As of noon for today, it produced 1.4 kWh. It's foggy and light drizzle, we will be lucky to get 2 kWh total today.
Since installation on July 25, 2012, the total system output in AC kWh is 4214. The annual model prediction is 4447 AC kWh's.
My net usage was 425 kWh, the system produced 375 kWh. If the next two days are partly sunny as forecast, production would be above 400 kWh.
May of last year our usage was 344 kWh. The change-over to an electric water heater is increasing our usage by around 100 kWh's per month.
The lengthening daylight hours as we approach the Summer Solstice on June 21 help, but not as much as one might think. Many of those increased daylight hours occur while the sun is north of true east or west--meaning the sun is shining on the back side of the collectors during those hours. We do get a little bit of output due to ambient light however.
The PVWatts model AC kWh predicted/actual:
2012
Aug. 383/460.7
Sep. 394/480.9
Oct. 369/378.6
Nov. 283/400.3
Dec. 331/297.2
2013
Jan. 388/440
Feb. 412/375
Mar. 509/462
Apr. 374/487
May 353/375
Jun. 308/TBD
Jul. 341/TBD
