Installation - Samlexpower PST-300-12 Manuel Du Propriétaire

Section 8 |
8.4.5 Recommended Sizes of DC Cables and External Fuses for
Battery Connection
Sizes of cables and external fuses are given in Table 8.1. The distance of 3 ft. / 6 ft. / 10 ft.
is the distance between the battery and the inverter. The running length of routing of
the cable should be considered if the cable run is not straight but circuitous. The recom-
mended size of cables will limit the voltage drop to 2% of the nominal battery voltage
(0.24V for 12V battery and 0.48V for the 24V battery).
The length of the cable for calculating voltage drop has been taken as 2 times the
distance between the inverter and the battery assuming that 2 lengths of cables (one
Positive and one Negative) are used for the connection. DC resistance values are based
on uncoated, stranded copper conductors at a temperature of 75°C. This temperature is
typical of operating power circuits.
TABLE 8.1 DC INPUT CABLES AND FUSES
Model No. Maximum
DC input
current at
rated output
power
(1)
PST-300-12
PST-300-24
NoTES foR TABLE 8.1
1. T he Ampere Carrying Capacity (Ampacity) of various sizes of cables (Columns 4 to 6) is based on ISo
10133 for single, insulated conductors rated at 105°C, and installation in free air at 30°C ambient
temperature.
2. C olumn (3) shows the minimum Ampacity of cable sizes as per the National Electrical Code (NEC).
This is = 1.25 times the maximum DC input current at the rated output power (Column 2) (Refer to
NEC-2014, Section 215.2(A)(1)(a) for feeder Circuits).
3. C olumns (4) to (6) show cable sizes that are based on NEC Ampacity (Column 3) or 2% voltage drop
due to rated maximum current (Column 2) fl owing through resistance of cable run (2x distance),
whichever is thicker.
4. C olumn (7) shows the fuse rating which is equal to or more than the maximum rated input current
(Column 2) but less than the Ampacity of the cable size (Column 4 to 6) as per ISo 10133 specifi ca-
tions at Note 1 above.
8.4.6 DC Input Connection
The DC input terminals for battery connection (6 & 7 in fig. 6.1) have cylindrical hole (5 mm
dia.) with set screw (#10, 24 TPI).
8.4.7 Detachable DC Input Cable Sets Provided
following DC Input Cable Sets have been provided for temporary connection to vehicle
battery for powering low power devices like lap-top, cell phone charger, etc.
34 | SAMLEX AMERICA INC.

installation

Minimum
Ampacity
(See Note 2)
(2) (3)
40A 50A
20A 25A
Size of Cable
based on distance between
battery and Inverter
(See Notes 1, 2 and 3)
3 ft. 6 ft.
(4) (5)
AWG AWG
#8 #6
AWG AWG
#12 #12
Current rating
of external fuse
(See Note 4)
10 ft.
(6) (7)
AWG
40A
#4
AWG
20A
#10