42 | SAMLEX AMERICA INC.
SECTION 3 |
Installation
3.5.3 Connection From Batteries / External Charge Controller To The DC Input Side – Sizing of
Cables And Fuses
WARNING!
The input section of the inverter has large value capacitors connected across the input terminals.
As soon as the DC input connection loop
(
Battery (+) terminal
→
Fuse
→
Positive input terminal of
EVO™
→
Negative input terminal of the EVO™
→
Battery (–) terminal
)
is completed, these capacitors
will start charging and the unit will momentarily draw very heavy current that will produce
sparking on the last contact in the input loop even when the unit is in powered down condition.
Ensure that the fuse is inserted only after all the connections in the loop have been completed so
that sparking is limited to the fuse area.
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
TM
→
borne d'entrée négative de l'EVO
TM
→
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 specific temperature e.g. 90˚C/194˚F. As current flow
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 fire.
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.
Summary of Contents for Evolution EVO-4248SP
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