How to use the Classic String Sizing Tool
Temperature
° °
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 °
Hottest Ambient Temp °
Nominal Battery Voltage (Volts)
PV Array
Number Of Modules In Series
Number Of Parallel Strings
Total Modules
Reset
PRINT RESULTS
CLASSIC SIZING TOOL
  PV Module Data
MidNite Solar Inc.
17722 - 67th Ave NE,
Arlington, WA 98223
Ph. 360-403-7207
Fax 360-691-6862
www.midnitesolar.com
Power: 100 Watts
VOC (Open Circuit Voltage): 21.6 Volts
VMP (Maximum Power Point Voltage): 17.4 Volts
ISC: (Short Circuit Amperage) 6.32 Amps
IMP (Maximum Power Point Amperage): 5.75 Amps
VOC Temp Coef %: 0.33 C°
VMP Temp Coef %: 0.45 C°
  Environmental Data
Coldest Ambient Temperature: 15 F°
Hottest Ambient Temperature: 117 F°
Nominal Battery Volts: 12 Volts
PV Array
Number Of Modules In Series: 8
Number Of Parallel Strings: 2
Total Modules 16
Rated PV Array Power: 1600 Watts
Anticipated Array Power @ 117F: 1440 Watts
Rated PV Array Current: 11.5 Amps
Battery Charging Current @ 14.4 V: 111.1 Amps
VMP (Maximum Power Point Voltage) : 139.2 Volts
VOC (Open Circuit Voltage): 172.8 Volts
VMP @ 15 F°: 160.8 Volts
VOC @ 15 F°: 192.8 Volts
Classic, Classic SL & Classic Lite Charge Controller Selection
 150 200 250
Max Operating Voltage 150 200 250
Max Non operating VOC (HyperVOC) @ 12V Nominal Battery Voltage 162 212 262
Maximum Number Of Modules In Series 6 8 10
Max Number Of Modules In Series (Using HyperVOC) 6 8 10
Max Allowable Output Current Per Classic
Based On This Current Configuration 		92 74 61
Max Allowable Wattage Per Classic
Based On This Current Configuration 		1325 1065 878
Present PV Array Wattage Of This Configuration 1600 1600 1600
Design Check
Max VOC TOO HIGH OK OK
Temperature The Classic Will
Enter HyperVOC 		ALWAYS-9.4 F°-166 F°
Array Power (Wattage) EXCESSIVE EXCESSIVE EXCESSIVE
Classics Required 1.3 1.6 1.9
NOTE: MidNite Solar recommends a second controller be added after 1.2
NOTE: Generally speaking you'll want to use the Classic 150 or 200 as they are less expensive and will handle more power. With MPPT controllers the higher the input voltage the less efficient they are. This is not a large value but it will add up to a little more heat in the controller and a point or two less in efficiency. BUT you also have to be careful not to have the input voltage to low. Most all MPPT controllers will want to see a minimum of 130% of the actual high battery voltage. So if we have a 48v battery and it has an Equalize voltage if 62.3 volts than we would multiply that by 130% and we would need a minimum of 81 volts on the input on the hottest day of the year in order to have enough headroom for the MPPT to work.
WARNING: MidNite Solar makes no representation, warranty or assumption of liability regarding the use of the String Calculator. This tool uses data provided by other parties (such as PV module specs) and makes calculations based on assumptions which may or may not prove to be valid.
To ensure proper start up and MPPT operation, the minimum initial PV input voltage should be at least 30% higher than the highest expected battery voltage.