44 | SAMLEX AMERICA INC.
SECTION 3 |
Installation
3.5.6 DC Input Connection for External Solar Charge Controller
External charger is connected to terminals consisting of M8 Stud with Thumb Nut
[3, 4 in Fig. 3.8 (a)]
.
- Max current fed through these terminals should be < 100A
- Use wire size given in Table 3.1.
- Tightening torque for the Thumb Nut is 35 kgf.cm (2.5 lbf.ft)
- Use appropriate fuse (
see Table 3.1
) in series with the Positive wire to protect against short circuit along the length of
the connecting wires.
Fuse should be close to the Positive Input Terminal.
- Please refer to Section 5.4 for details of charging using external solar charge controller.
TABLE 3.1 SIZING OF DC SIDE CABLES AND FUSES
Model No.
(Column 1)
Rated
Continuous
DC Input
Current
(See Note 1)
(Column 2)
NEC Ampac-
ity = 125%
of Rated DC
Input Current
at Column 2
(See Note 2)
(Column 3)
90°C Copper Conductor. Size Based on NEC Ampacity
at Column (3) or 2%Voltage Drop, whichever is Thicker
(See Note 3)
External Fuse
Based on NEC
Ampacity at
Column (3)
(See Note 4)
(Column 8)
Cable Running Distance
between the Unit and
the Battery
(Cable Routing In Free Air)
Cable Running Distance
between the Unit
and the Battery
(Cable Routing In Raceway)
Up to 5 ft.
(Column 4)
Up to 10 ft.
(Column 5)
Up to 5 ft.
(Column 6)
Up to 10 ft.
(Column 7)
EVO-4248SP
137A
171A
AWG #2
AWG #2
AWG #2/0
AWG #2/0
200A
External
Charger
Controller
= 1.25 times
the Short
Circuit Cur-
rent (Isc) of
the solar
panel/array
=1.25 times
the value in
Column 2
Determine the cable size based on guidelines given in Note 3
See Note 4
NOTES FOR TABLE 3.1 - SIZING OF BATTERY SIDE CABLES AND EXTERNAL BATTERY SIDE FUSES
1) Column 2 indicates the Rated Continuous DC Input Current drawn from the battery in Inverter Mode or, 1.25
times the Short Circuit Current (Isc) of the solar panel/array (
for Charge Controller
).
2) Column 3 indicates NEC Ampacity based on which cable conductor sizes (
Columns 4 to 7
) are determined.
NEC Ampacity is not less than 125% of the Rated Continuous DC Input Current (
Column 2
) - Refer to NEC-
2014 (
National Electrical Code
) - Section 215.2(A)(1)(a) for Feeder Circuits.
3) Columns 4 to 7 indicate cable conductor size that is based on the following 2 considerations. Thicker
conductor out of the following 2 considerations has been chosen:
a) As per guidelines in NEC-2014 (
National Electrical Code
) - Ampacity Table 310.15(B)(16) for Raceway and
Ampacity Table 310.15(B)(17) for Free Air. Conductor size is based on (i) NEC Ampacity specified at Column
3, (ii) Copper conductor with temperature rating of 90°C and (iii) Ambient temperature of 30°C / 86°F
b) Voltage drop across the length of cables has been limited to 2% of 48V. Voltage drop has been calculated
by multiplying the Rated DC Input Current (
Column 2
) and the resistance of the total length of Copper
conductor (the total length of conductor has been taken as 2 times the running distance between the unit
and the battery to cover 2 lengths of Positive and Negative cable conductors).
4) Column 8 indicates the size of external fuse in the battery circuit. It is mandatory to install this fuse within
7” of the battery Positive terminal to protect the internal DC Input Section of the unit and also to protect
the battery cables against short circuit. Ampere rating of the fuse is based on the following considerations:
Summary of Contents for Evolution EVO-4248SP
Page 115: ...SAMLEX AMERICA INC 115 NOTES...
