![]() ![]() The total transparency of the atmosphere from ground to space. Here 'transparency' means just what astronomers mean The line, labeled Transparency, forecasts the transparency of the air. It's always wise to click on a colored block for the hour you want to observe and see if your location is close to a cloud edge.ĬMC's text page explaining this forecast is Is 76% and the mostly-cloudy accuracy is 89%. When the forecast is predicting more than 36 hours into the future, the mostly-clear accuracy Mostly-clear forecasts (cloud75%) have been When the forecast is clear, the sky may still be hazy, if the transparency forecast is poor.Īccuracy averaged over North America for a 30 day period: when the forecast is predicting less than 12 hours into the future, This forecast may miss low cloud and afternoon thunderstorms. Lighter shades of blue are increasing cloudiness and white is overcast. The colors are picked from what color the sky is likely to be, with The line, labeled Cloud Cover forecasts total cloud cover. (Local time for Knoxville is -4.0 hours from GMT.) ![]() A digit 1 on top of a 3 means 13:00 or 1pm. The two numbers at the top of a column is the time. ![]() The colors of the blocks are the colors from CMC's forecast maps for that hour. Summary: In the rows labeled "sky conditions", find a column of blue blocks. Summarizes CMC's forecast images just for KnoxvilleĪnd the surroundings out to about 10 miles. So, I (Attilla Danko) wrote a script to generate the images like the one above It can be a chore to find the one map that tells you if you can observe tonight. CMC's numerical weather forecasts are unique because they are specifically designed for astronomers.īut they have 1180 forecast maps. The data comes from a forecast model developed by Allan Rahill of theĬanadian Meteorological Centre. It's a prediction of when Knoxville, TN, will have good weather for astronomical observing. At a glance, it shows when it will be cloudy or clear for the Lifepo4 you can hit them with maximum amps till they are almost full, its a waste to trickle charge them because the controller thinks they are full.Home of the Smoky Mountain Astronomical Society (SMAS). If your pwm controller has no display showing volts/amps, you need to get a 90 volt 30 amp combometer and place that between the controller and battery, that will show what the controller is putting out, next measure the voltage on the battery terminals, if they differ then you have voltage drop, you need to increase the bulk voltage to compensate. When set to 14.6 volts, the controller always goes into float and charges at less then 4 amps, at 15.5 volts I get close to 12 amps of charging current. I have to set my mppt controller bulk setting to 15.5 volts (highest it will go) just to get a full charge. Lifepo4 voltage is close to what a 12 volt battery reads when its full, so the controller will either switch to float or reduce amps to the battery. With voltage drop 14.4 volts aint going to cut it. With lithium and solar you need a solar controller you can adjust. I use the tk15 (cost about 25 dollars) it handles up to 50 amps in/out, but they sell ones that can handle over 100 amps. Because of the heat I been using my swampcooler 24/7 and thought I was fully charging my battery every day but when I checked my 2 lifepo4 (110ah each) they are both down to 49ah,without the coulombmeters I would think they were full, since they read 13.1 volts. That way you never take it down to empty. Lifepo4 voltage is almost always at the 13.1 volt area except when its fully charge or near empty. If you don''t have a coulombmeter, you need one. ![]()
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