SamplexPower PST-300-12 Manuel Du Propriétaire page 32

seCtIOn 8 |
WARninG!
Use of an appropriately sized external fuse as described above is mandatory to
provide safety against fire hazard due to accidental short circuit in the battery
wires. Please note that the DC side fuse(s) inside the unit are designed to pro-
vide protection to the internal components of the inverter. These fuses will NoT
blow if there is a short circuit along the length of wires connecting the battery
and the inverter.
Recommended Sizes of Wires and external Fuses
The following sizes of wires and external fuses are recommended. 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 wire should be considered if the wiring run is not straight but circuitous.
The recommended size of wires 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 wire for calculating voltage drop has been taken as 2 times the
distance between the inverter and the battery assuming that 2 lengths of wires (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.
Model no.
PST-300-12
PST-300-24
*
NoTES:
1. The ampere carrying capacity (Ampacity) of various sizes of wires is based on NEC Table 310.17
for single, insulated conductors rated at 90˚C insulation, and installation in free air at 40˚C ambi-
ent. The maximum fuse rating should be equal to or less than the ampicity of the wire.
2. The wire size is based on allowable ampacity or 2% voltage drop, whichever is thicker.
Dc input connection
In PST-300's, 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).
Detachable Dc input Wiring Sets Provided with PSt-30S
following DC Input Wiring Sets have been provided for temporary connection to vehicle
battery for powering low power devices like lap-top, cell phone charger, etc. Please limit
the power drawn to less than 150W:
• Wire set with cigar plug - AWG#14
32 | SAMLEX AMERICA INC.
Installation
Maximum
Dc input current
at rated output
power
40A AWG #8
20A AWG #12
Size of Wire
3 ft. 6 ft.
AWG #6
AWG #12
Minimum
current rating of
external fuse
10 ft.
AWG #4 40A
AWG #10 20A