Samlexpower Pure Sine Wave PST-600-12 Guide Du Propriétaire page 31

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terminal of the unit and the Negative of the battery to the Negative terminal
of the unit). If the input is connected in reverse polarity, DC fuse(s) inside the
inverter will blow and may also cause permanent damage to the inverter.
connection from the Batteries to the Dc input Side of the Unit –
Wire and external Fuse Sizes
WARninG!
The input section of the inverter has large capacitors connected across the
input terminals. As soon as the DC input connection loop (Battery (+) terminal
► External fuse ► Positive input terminal of the inverter ► Negative input
terminal of the inverter ► 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 oN/
off switch on the inverter is in the off position. Ensure that the external fuse is
inserted only after all the connections in the loop have been completed so that
the sparking is limited to the fuse area.
The 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 conduc-
tor produces undesirable effects of voltage drop and heating. Thus, thicker and shorter
conductors are desirable.
The size (thickness / cross-section) of the conductors is designated by AWG (American
Wire Gauge). Please note that a smaller AWG # denotes a thicker size of the conductor
up to AWG #1. Wires thicker than AWG #1 are designated AWG 1/0, AWG 2/0, AWG 3/0
and so on. In this case, increasing AWG # denotes thicker wire.
The DC input circuit is required to handle very large DC currents and hence, the size of
the wires and connectors should be selected to ensure minimum voltage drop between
the battery and the inverter. Thinner wires 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 wire should be such that the voltage
drop due to the current & the resistance of the length of the wire should be less than
2%. Use oil resistant, multi- stranded copper wire wires rated at 90ºC minimum. Do not
use aluminum wire as it has higher resistance per unit length. Wires 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 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.
Installation
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