Solar Panel Voc-MPPT?

NinerBikes wrote:

BFL13 wrote:
You need the same lighting to last through the time it takes to swap controllers, as you know, so such tests require special days where there are no pretty white clouds rushing by all the time screwing up the readings.

What time of day was the 10a?

My flat vs tilted and tracking results in May at 49.2N were 56, 70, and 90 AH/day but % diffs in amps at any one time of day varied by time of day. (single 130w panel)

Time, Flat , Tilted, Tracking- Amps

0700- 1.0, 0.6, 3.7
0800- 2.0, 1.7, 5.7
0900- 3.6, 3.6, 7.3
1000- 5.1, 6.2, 8.1
1100- 6.3, 6.8, 8.2
1200- 6.9, 7.7, 7.7
1300- 7.2, 8.3, 8.3
1400- 7.1, 7.7, 7.7
1500- 6.4, 6.9, 8.1
1600- 5.0, 6.6, 8.1
1700- 3.9, 5.4, 7.3
1800- 2.0, 3.3, 5.7
1900- 1.0, 1.7, 3.7

Any idea what the date in May was that you logged these results?

And what did you use to aim the panel?

amp meter for max for tracking?

Point it due south for tilted?

When laying flat, was there any variance in output if it was layed portrait vs landscape in orientation, due south?

BTW, thank you, this live data is pure gold, for me, at least. Close enough for government work.

It was a couple days including 18 May. Panel pointing South. No diff portrait or landscape with panel in a swivel contraption. In this contraption, you want the narrow end to the South or it has to be too high for clearance when flopped over.

I aimed the panel by first finding South using the Sun at 1300 then adjusted a bit based on max Isc so "noon" turned out to be more like 1315 at that longitude wrt our time zone. I used macslab website for optimum tilt up angle info.

This year I used a swivel contraption, but I think I got more AH with the floppy shown here. The swivel needs to have a tilt adjustment for best results and I didn't have that. The floppy is already tilted.

http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/26065604.cfm