44 | SAMLEX AMERICA INC.
SECTION 3 | Installation
3.5.4 Fuse Protection In The Battery Circuit
A battery is an unlimited source of current. Under short circuit conditions, a battery can supply thousands of Amperes
of current. If there is a short circuit along the length of the cables that connects the battery to the inverter, thousands
of Amperes of current can ow from the battery to the point of shorting and that section of the cable will become
red-hot, the insulation will melt and the cable will ultimately break. This interruption of very high current will generate
a hazardous, high temperature, high-energy arc with accompanying high-pressure wave that may cause re, damage
nearby objects and cause injury. To prevent occurrence of hazardous conditions under short circuit conditions, the
fuse used in the battery circuit should limit the current (should be "Current Limiting Type"), blow in a very short
time (should be Fast Blow Type) and at the same time, quench the arc in a safe manner. For this purpose, UL
Class T fuse or equivalent should be used (As per UL Standard 248-15). This special purpose current limiting, very
fast acting fuse will blow in less than 8 ms under short circuit conditions. Appropriate capacity of the above Class
T fuse or equivalent should be installed within 7” of the battery Plus (+) Terminal (Please see Table 3.1 for
fuse sizing).
Marine Rated Battery Fuses, MRBF-xxx Series made by Cooper Bussmann may also be used. These fuses comply with
ISO 8820-6 for road vehicles.
WARNING!
It is mandatory to use appropriately sized external fuse in the battery and External Charger Circuits. If external
fuse is not used and reverse polarity connection is made by oversight, the input section of the unit will be
damaged/burnt. Warranty will be voided in such a situation.
MISE EN GARDE!
Il est obligatoire d’utiliser un fusible externe de taille appropriée à la batterie et les circuits chargeur externe .
Si le fusible externe est pas utilisé et les inversions de polarité est faite par la surveillance , la section d’entrée
de l’unité est endommagée / brûlé . La garantie sera annulée dans une telle situation.
3.5.5 DC Input Connection for Battery
Battery is connected to terminals 1, 2 shown in Fig 3.8. The terminal consists of M10 Stud & Nut. Tightening torque
for the nut is 70 kgf.cm (5 lbf.ft). Sizes of cables and fuses are shown in Table 3.1. Sizing is based on safety
considerations specied in UL-1741 and NEC-2014. See details under “Notes for Table 3.1”.
3.5.6 DC Input Connection for External Solar Charge Controller
External charger is connected to terminals consisting of M12 Stud with Thumb Nut (3, 4 in Fig. 5.8).
External charger is connected to terminals consisting of M6 Stud (Pitch 1 mm) with Thumb Nut (3, 4 in Fig. 3.8).
- Max current fed through these terminals should be < 50A
- Use wire size given in Table 3.1.
- Tightening torque for the Thumb Nut is 35 kgf.cm (2.5 lbf.ft)
- Use 70A fuse 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 3.
- Please refer to Section 5.4 for details of charging using external solar charge controller.
To Next Page
Loading...
