Progress Solar/Wind SLT 700 Series - Page 130

71TriStar MPPT Operator’s Manual
70
Specications
Minimum Battery Wire Sizes - 75°C or 90°C Rated Stranded Copper
MODEL
Wire Size in a raceway, cable,
or earth
1
Wire Size in free air
2
Metric
Wire Size
3
(mm
2
)
@30ºC 30º-45ºC @30ºC 30º-45ºC
TS-MPPT-30 #8 AWG #8 AWG #10 AWG #10 AWG
6 - 10
TS-MPPT-45
#6 AWG
#4 AWG > 40°C
#8 AWG #8 AWG 10 - 18
TS-MPPT-60/M #4 AWG
#3 AWG > 40°C
#6 AWG #6 AWG 16 - 25
1
Per NEC 2021 [see NEC Table 310.15(b)(16)], ampacity for not more than three current-carrying
conductors in a raceway, cable, or earth (buried)
2
Per NEC 2021 [see NEC Table 310.15(b)(17)], ampacity for conductors in free air
3
Estimated. See local code requirements for metric cable sizing
Table A-1. Minimum Battery Stranded Wire Sizes for 75°C or 90ºC Rated Copper
Celsius to Fahrenheit Conversions
ºCelsius ºFahrenheit
30 86
35 95
40 104
45
113
Table A-2. Celsius to Fahrenheit Conversions
APPENDIX A - Wire Sizing
Minimum Wire Sizing
Wire sizing requirements are based on the ampacity (or current carrying capacity) of conductors. The
NEC includes Ampacity Tables which are used to determine the ampacity for a given wire size as
indicated in Section 310.15.
TriStar MPPT power terminals are rated for 75ºC. When wires with a 90°C temperature rating are
used with terminals that have a 75°C temperature rating, wire ampacity at 75°C must be used.
Wire ampacity requirements for the battery and PV array circuits are as follows:
Controller battery wire ampacity must be greater than or equal to 125% of maximum continuous
current (battery current rating of the controller)
PV array wire ampacity must meet both of the following requirements:
Must be greater than or equal to 156% of PV Array Isc without correction and adjustment factors
Must be greater than or equal to 125% of PV Array Isc with correction and adjustment factors
Correction and adjustment factors may also be required to account for the following:
• maximum ambient temperature
• temperatures at di󰀨erent parts of the circuit (rooftops or engine rooms for example)
• wire terminal temperature ratings
• multi conductor cables
• conduit ll and other factors