SAMLEX AMERICA INC. | 43
SECTION 3 |
Installation
Effects of low voltage on common electrical loads are given below:
•
Lighting circuits - incandescent and Quartz Halogen:
A 5% voltage drop causes an approximate 10% loss in
light output. This is because the bulb not only receives less power, but the cooler filament drops from white-hot
towards red-hot, emitting much less visible light.
•
Lighting circuits - fluorescent:
Voltage drop causes a nearly proportional drop in light output.
•
AC induction motors -
These are commonly found in power tools, appliances, well pumps etc. They exhibit very
high surge demands when starting. Significant voltage drop in these circuits may cause failure to start and possible
motor damage.
•
PV battery charging circuits
- These are critical because voltage drop can cause a disproportionate loss of charge
current to charge a battery. A voltage drop greater than 5% can reduce charge current to the battery by a much
greater percentage.
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 flow 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 fire, 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).
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(a). The terminal consists of M8 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 specified in UL-1741 and NEC-2014. See details under “Notes for Table 3.1”.
Summary of Contents for Evolution EVO-4248SP
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