1961 to 1990, for more accurate local area generation predictions.


Mo. Days/ Clear Clear %Sun Clear Rain Fog Avg Hi Solar Solar
Mo/ Day Day /Mo Days Days Days Temp Decl. Decl.
Leap Hrs/ Hrs/ /Mo /Mo /Mo /Mo (CDT) NO
Mo Day CDT
/Leap

Jan 31 192.5 6.2 59 10.5 6 10.5 44 37.71 NA
Feb 28/29 187 6.7/6.4 57.5 10.5 6.5 11 48 8.86 NA
Mar 30/31 234 7.5 61.5 9 8.5 11 58 (44.99) 49.85
Apr 30 264.5 8.8 65 9 9.5 8.5 68.5 (56.44) 61.91
May 31 290 9.4 63.5 8.5 11 9.5 77 (64.27) 70.89
Jun 30 316 10.5 70.5 10 10 6.5 85.5 (66.8) 74.66
Jul 31 343 11 75.5 14 7 5 91.5 (64.41) 72.37
Aug 31 311.5 10 73 13 7.5 7.5 90 (58.88) 65.22
Sep 30 252.5 8.4 69 12.5 7.5 10 82.5 (50.48) 54.73
Oct 31 229.5 7.4 65 13.5 7.5 8.5 70.5 (40.65) 43.45
Nov 30 171 5.7 55 10.5 6 10.5 57.5 33.63 NA
Dec 31 164 5.3 53.5 11 6 11.5 46 28.90 NA
Tots 365/ 2955.5 8/8 64 130 93 110 68.3 N+ Lat/37.533 Avgs 366 W+ Lon/95.825
*3 *3 *1 *2 *2

NOAA definition of a clear day is 70%+ cloud free sky.
*1 If panel effeciency is a concern, then use this column for your calculations
This will vary by: type, grade, % remaining if broken, etc. Group all cells by
type and calculate seperately, for accuracy. Cell effeciency falls with
temperature climb.
*2 - Solar Declination, at specific Lat/Long, above, this is the panel angle
if fixed mount is used and the pivot angle if a single axis tracking panel
mount is used.
*3 - Use these columns for power generation profit/loss calculations. Select
either per month or per day column times your total panel wattage for (watt)
(hrs), if (kilowatt)(hrs) is needed, then divide (watt)(hrs) by 1000, for
(kilowatt)(hrs)..Take the annual total divided by your annual (kilowatt)(hrs)
bill and then times 100, for a percentage of your generation/use. 100%, is
a perfect balance of generation vs consumption. 100%+ is surplus generation
than can be stored or sold back. Ideally, you want to store enough for when
you have 2 to 3 days of cloudy weather, then sell back surplus once all batter
banks are charged. If for example this percentage is 75%, then you generated
75% of your power needs and bought 25% of your power from your company provide
Power gained on Rain/Cloudy/Fog days should be regarded as bonus /luck (watt)
(hrs) and should not be relied upon. NOTE: All this does not consider the
type of inverter system to be used. Generally, most any 12 volt inverter
will do where 120 Vac supply is needed. This is nice and easy setup, with
the lowest expense, as a single stack of batteries and panels is needed.
Where 240 Vac supply is needed, usually a 24 or 48 volt system will be needed.
Now, where 24 volt systems go, this doubles (2X) the amount of solar panels
and batteries! The efficiency on the inverters are not as high on 24 volt
systems, as the 48 volt systems. One must weigh this problem very carefully,
if one really wants the efficiency of a 48 volt system, then that same person
must be prepared to pay for the quadruple (4X) the amount of panels &
batteries!
I really can't advise them, just get running. True sine wave inverters are
regarded as the best, in power quality and ability in powering sensitive
devices. A modified square wave, should be decent, as well. I wouldn't
attempt to power a stereo or radio gear from a simple square wave inverter,
just too much hash noise! In selecting your inverter, pay close attention
to the dc input current under max load and under zero load. The max load dc
current is where your will calculate your battery drain cycle. The zero load
input draw off the batteries is your minimum no load draw off your batteries
24/7! Get the lowest rating you can, why spend any more power for having the
inverter just on any more than needful that will stretch your battery draw
cycle more.

--- Mystic BBS v1.12 A33 (Windows/32)
* Origin: flupH | fluph.darktech.org (9:91/1)