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    redbud1's Avatar
    redbud1 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Aug 23, 2008, 10:26 AM
    Thermostat change
    Need suggestions for what would be proper stat for 2 heat 1 cool system. Currently using white rodgers thermostat, which lacks backlit feature and has no battery backup for power outages. Is a 24v wired system. 7 day programmable features. Thanks
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Aug 23, 2008, 11:09 AM
    You have a few to pick from. White Rodgers and Honeywell both have back lit and battery backup models. Cost will be a factor since the more you spend the more accessory toys you get.
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
    Ultra Member
    		  
    #3

    Aug 23, 2008, 01:58 PM
    If you have a heat pump be sure to get the heat pump thermostat. They make 2 stage heat thermostats for just electric strip heat and gas furnace heat that will not work with a heat pump.
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
    Uber Member
    		  
    #4

    Aug 23, 2008, 03:00 PM
    Look at the vision pro 8000 series by Honeywell. Good source of info Furnace Filters, Air Conditioner Filters, Air Quality - iaqsource. Presented nicely.
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
    Uber Member
    		  
    #5

    Aug 23, 2008, 05:26 PM
    This pretty much explains it: Spectral Curves

    Each material (Silicon, CuInSe2, GaAs) has spectral response.

    The sun has a particular irradiance. Solar cells are tested at 25. Deg C with a lamp that emulates the AM 1.5 Global spectrum. AM = Air Mass. AM 0 would be above the atmosphere.

    You can actually calculate the short circuit current of a solar cell knowing the AM 1.5 Spectrum and the spectral response of the solar cell.
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