Tom - of course i will keep the community updated - even if i screw that head up. ))
Sean - i do live a few hundreds kilometers south from Sweden - so it is further north than mainland US.
the panels are mounted on trackers and are facing west, the photo was taken in late afternoon - around 17:00
here is snippet from tracker control program - a lookup table for altitude angle of the sun at noon of every day of the year, according to that table, altitude angle varies between 9 degrees 55 moa at winter solstice to 56 degrees and 21 minute of angle at summer solstice.
unsigned int max_altitude (unsigned int numof_day) {
–numof_day;
const static unsigned int alt[] PROGMEM = {955,1000,1002,1005,1011,1017,1024,1031,1038,1046,1054,1103,1112,1122,1132,1142,1153,1204,1216,1228,1240,1253,1306,1320,1333,1348,1402,1417,
1433,1448,1504,1521,1537,1554,1612,1629,1647,1705,1723,1742,1801,1820,1840,1900,1920,1940,2000,2021,2042,2103,2124,2145,2207,2229,2251,2313,2335,2358,2420,2443,2506,2529,2552,2615,
2638,2702,2725,2749,2812,2836,2900,2924,2947,3011,3035,3059,3123,3147,3211,3235,3259,3323,3346,3410,3434,3444,3458,3522,3545,3609,3633,3656,3720,3743,3806,3829,3852,3915,3938,4001,
4024,4046,4108,4130,4152,4214,4236,4258,4319,4340,4401,4422,4443,4503,4523,4543,4603,4623,4642,4701,4720,4739,4757,4816,4833,4851,4908,4926,4942,4959,5015,5031,5047,5102,5117,5132,
5146,5200,5214,5228,5241,5253,5306,5318,5330,5341,5352,5403,5413,5423,5432,5441,5450,5458,5506,5514,5521,5528,5534,5540,5546,5551,5556,5600,5604,5608,5611,5613,5616,5618,5619,5620,
5621,5621,5621,5620,5619,5618,5616,5614,5611,5608,5604,5600,5556,5551,5546,5541,5535,5529,5522,5515,5508,5500,5452,5443,5434,5425,5416,5406,5355,5345,5334,5322,5311,5259,5246,5234,
5221,5207,5154,5140,5126,5111,5057,5042,5026,5011,4955,4939,4922,4906,4849,4832,4814,4756,4739,4721,4702,4644,4625,4606,4547,4527,4508,4448,4428,4408,4348,4327,4306,4246,4225,4203,
4142,4121,4059,4038,4016,3954,3932,3910,3847,3825,3803,3740,3717,3655,3632,3609,3546,3523,3500,3437,3414,3350,3327,3304,3241,3217,3154,3131,3107,3044,3021,2958,2934,2911,2848,2825,
2802,2739,2716,2653,2630,2608,2545,2523,2500,2438,2416,2354,2332,2310,2248,2227,2205,2144,2123,2102,2042,2021,2001,1941,1921,1902,1842,1823,1804,1745,1727,1709,1651,1633,1616,1559,
1542,1525,1509,1453,1438,1422,1408,1353.1339,1325,1311,1258,1245,1233,1221,1209,1158,1147,1136,1126,1117,1107,1058,1050,1042,1034,1027,1020,1014,1008,1003,958,953,949,946,942,940,
937,936,934,933,933,933,933,934,936,938,940,943,946,950};
unsigned int flashread = pgm_read_word_near(alt + numof_day);
return (flashread / 100 * 60) + (flashread % 100);
}
Kent - what annoys me most about the solar panels in winter is that raised aluminum frame rim around panel surface - bottom part of it it prevents snow from slipping off the panels even at steep angle.
edit: it is 9d 33m at winter solstice, forgot that start of calendar year does not match solstice. ))
