SAMLEX AMERICA INC. | 43
SECTION 3 | Installation
MISE EN GARDE!
La section d'entrée de l'onduleur possède une grande valeur condensateurs connectés à travers
les bornes d'entrée. Dès que la connexion d'entrée CC (boucle de la batterie (+) → le fusible
→ la borne d'entrée positive d'EVO → borne d'entrée négative de l'EVO → la batterie (–) est
terminée, ces condensateurs va démarrer la charge et l'appareil se tirer momentanément
actuelle très lourd qui va produire des étincelles sur le dernier contact de la boucle d'entrée
même lorsque l'appareil est en état hors tension.
Assurez que le fusible est insèrer seulement après que toutes les connexions sont faites dans le
boucle pour que des étincelles se produisent seulement à l’endroit du fusible.
Flow of electric current in a conductor is opposed by the resistance of the conductor. The resistance of the
conductor is directly proportional to the length of the conductor and inversely proportional to its cross-section
(thickness). The resistance in the conductor produces undesirable effects of voltage drop and heating. The size
(thickness / cross-section) of the conductors is designated by AWG (American Wire Gauge). Conductors thicker
than AWG #4/0 are sized in MCM/kcmil.
Conductors are protected with insulating material rated for specic temperature e.g. 90˚C/194˚F. As current ow
produces heat that affects insulation, there is a maximum permissible value of current (called “Ampacity”) for each
size of conductor based on temperature rating of its insulation. The insulating material of the cables will also be
affected by the elevated operating temperature of the terminals to which these are connected. Ampacity of cables is
based on UL-1741 and the National Electrical Code (NEC)-2014. Please see details given under “Notes for Table 3.1”.
The DC input circuit is required to handle very large DC currents and hence, the size of the cables and connectors
should be selected to ensure minimum voltage drop between the battery and the inverter. Thinner cables and loose
connections will result in poor inverter performance and will produce abnormal heating leading to risk of insulation
melt down and re. Normally, the thickness of the cable should be such that the voltage drop due to the current
& the resistance of the length of the cable should be less than 2%. Use oil resistant, multi-stranded copper wire
cables rated at 90º C minimum. Do not use aluminum cable as it has higher resistance per unit length. Cables can be
bought at a marine / welding supply store.
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 lament drops from white-hot
towards red-hot, emitting much less visible light.
• Lighting circuits - uorescent: 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. Signicant 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.
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