Charge Controller sizing tool

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Novaz
Novaz Solar Expert Posts: 57 ✭✭✭✭
in Solar Beginners Corner #1
Tried to use the Midnite Solar sizing tool for 4*250 watt Kyocera panels into a 24 volt battery voltage
it seems to be telling me that i cant use a Classic controller it maybe i entered the strings incorrectly ie 2 panels in series * 2 strings
I used the approx temp for Eastern Washington state
can any one see where i went wrong or are the classics to big for my proposed system
Thanks
Roy




Temperature
C° F°
PV Module Data (STC)
(Found on back of module or spec sheet)
Power (Watts)

VOC (Open Circuit Voltage)
VMP (Maximum Power Point Voltage)
ISC (Short Circuit Amperage)
IMP (Maximum Power Point Amperage)
VOC Temperature Coefficient C°
(Default is -0.33%) %
VMP Temperature Coefficient C°
(Default is -0.45%) %
Environmental Data
Coldest Ambient Temp C°
Hottest Ambient Temp C°
Nominal Battery Voltage (Volts)
PV Array
Number Of Modules In Series
WARNING: The PV array voltage (-101 Volts) on the hottest days may be too low to properly charge the selected battery voltage. Please consider adding to the number of modules in series.
Number Of Parallel Strings
Total Modules
Reset
PRINT RESULTS
PV Array
Rated PV Array Power: 1000 Watts
Anticipated Array Power @ 30C: -490 Watts
Rated PV Array Current: 8.39 Amps
Battery Charging Current @ 28.8 V: 34.7 Amps
VMP (Maximum Power Point Voltage) : 119.2 Volts
VOC (Open Circuit Voltage): 147.6 Volts
VMP @ -20 C°: 1717.6 Volts
VOC @ -20 C°: 2598.4 Volts
Charge Controller Selection
Classic150/Lite Classic200/Lite Classic250/Lite
Max Operating Voltage 150 200 250
Max Non operating VOC (HyperVOC) @ 24V Nominal Battery Voltage 174 224 274
Maximum Number Of Modules In Series 0 0 0
Max Number Of Modules In Series (Using HyperVOC) 0 0 0
Max Allowable Output Current Per Classic
Based On This Current Configuration 82 74 62
Max Allowable Wattage Per Classic
Based On This Current Configuration 2353 2123 1779
Present PV Array Wattage Of This Configuration 1000 1000 1000
Design Check
Max VOC TOO HIGH TOO HIGH TOO HIGH
Temperature The Classic Will
Enter HyperVOC 25 C° 24 C° 23 C°
Array Power (Wattage) OK OK OK
Classics Required 0.5 0.5 0.6
NOTE: MidNite Solar recommends a second controller be adde
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Comments

  • Cariboocoot
    Cariboocoot Banned Posts: 17,615 ✭✭✭
    #2
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    Re: Charge Controller sizing tool

    You've entered the panels as being all in series, judging by the Vmp & Voc.

    Number of Modules in Series should be '2' and Number of Parallel Strings should be '2'.
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  • Novaz
    Novaz Solar Expert Posts: 57 ✭✭✭✭
    #3
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    Re: Charge Controller sizing tool

    Thanks for rapid reply I figured it after i posted and went back again
    Roy
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  • Novaz
    Novaz Solar Expert Posts: 57 ✭✭✭✭
    #4
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    Re: Charge Controller sizing tool

    I thought i had posted this apologies if its duplicated
    is the 150 Classic going to be too much for this system ie approx 1KW
    just thinking that buying a good controller once would be better than buying another if i increase my PV panel size
    Thanks
    Roy
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  • Cariboocoot
    Cariboocoot Banned Posts: 17,615 ✭✭✭
    #5
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    Re: Charge Controller sizing tool

    It should not be a problem. 1kW on a 24 Volt system will put out 32 Amps. Now this could be fine on a 30 Amp Kid which will clip 2 Amps, but if you want to expand having the Classic's 80 Amp capacity is a good idea.

    Buying a good, flexible controller once is a good idea because yes you will only have to buy it once.
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