Samlex America SAM-3000-12 - Manual (Page 15)

12 | SAMLEX AMERICA INC. SAMLEX AMERICA INC. | 13
requirement of fuse in Battery connection
A battery is a very large source of current. If there is a short circuit along the length of
the cables that connect the battery to the inverter, thousands of Amperes of current can
flow from the battery to the point of shorting and that section of the cable will overheat,
the insulation will melt and is likely to cause fire. To prevent occurrence of hazardous
conditions under short circuit, fuse with Ampere rating ≥ the maximum continuous cur-
rent drawn by the inverter but ≤ the Ampacity of the connecting cable should be used
in the battery connection. The fuse should be fast acting Class-T or Marine Rated Battery
Fuse Type MRBF. Rating of fuse is shown in Table 4.2 below. The fuse should be installed
as close to the Battery Positive terminal as possible, preferably within 7”. Please note that
this fuse is required to protect the cable run from the battery to the inverter against short
circuit. The inverter has its own internal DC side fuse(s) for internal DC side protection.
making Dc Side connections
Recommended cable and fuse sizes for connecting battery are given in Table 4.2. The
maximum current for cable sizing / fuse rating has been considered at 1.25 times rated
continuous current draw at the rated output power.
table 4.2 recommended cable and fuse Sizes for Battery connection
model no.
rated
Dc input
current
cable Size 1
(ampacity)
max
fuse
Size 2
Distance between
inverter,
Battery and % Voltage
Drop 3
Samlex
fuse
(optional)
Samlex
cable +
fuse Kit
(optional) 3 ft. 6 ft. 10 ft.
SAM-1000-12 100A AWG#4
(160A)
100 to
150A
1.2% 2.4% 4.0% DC-FA-100 DC-1000-KIT
SAM-1500-12 150A AWG#2
(215A)
200A 1.2% 2.3% 3.8% DC-FA-200 DC-2000-KIT
SAM-2000-12 200A AWG#2/0
(329A)
300A 0.8% 1.5% 2.5% DC-FA-300 DC-2500-KIT
SAM-3000-12 300A AWG#4/0
(446A)
400A 0.7% 1.4% 2.4% DC-FA-400 DC-3500-KIT
noteS:
1. cable Size
• As per NEC, size is based on Ampacity ≥ 1.25 times the rated DC Input Current
• Conductor / Insulation rating : 105 °C
2. fuse Size
• Type: Class-T or Marine Rated Battery Fuse (MRBF)
• The rating of the fuse should not exceed the Ampacity of the Cable
3. Distance between inverter and Battery and % Voltage Drop
• Voltage drop is calculated based on length of cable = 2 x Distance to consider total length of Positive
and Negative cables
• % drop is calculated with respect to rated battery voltage of 12.5V
SECTION 4 | Installation
11002-SAM-1000-1500-2000-3000-12-0814.indd 15 14-08-12 9:59 AM