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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.
Use oil resistant, multi-stranded copper wire cables rated at 90 º C minimum. Do not use
aluminium cable as it has higher resistance per unit length. Cables can be bought at a
marine / welding supply store
The cables from the battery to the inverter should be protected by a suitable, very fast
acting DC fuse. Use a DC fuse of the appropriate capacity in line with the positive cable.
The fuse should be within 18" from the battery.
by Bussmann are recommended.
The following size of cables and fuses are recommended. The distance shown is the
distance between the battery and the inverter. The recommended size of the cables will
limit the voltage drop to approximately 2% ( The length of the cable for calculating the
voltage drop has been taken as 2 times the distance between the inverter and the battery
assuming that two ( one positive and one negative)cables are used for the connection )
PST-30S-12A
CAUTION!
The input section of the inverter has large value capacitors connected across
the input terminals. As soon as the DC input connection loop ( Battery +
Y Y Y Y Y fuse Y Y Y Y Y inverter + Y Y Y Y Yinverter - Y Y Y Y Y battery negative) is completed, these
capacitors will start charging and 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 fuse is
inserted only after all the connections in the loop have been completed so that
the sparking is limited to the fuse area.
Using proper DC cable termination
The battery end and the inverter end of the cables should have proper terminals that will
ensure a firm and tight connection.
DC input terminals
The DC input terminals have a tubular hole with a set screw. A suitable pin type of copper
terminal should, therefore, be used on the cable end.
the cable directly into the tubular hole as the set screw will not pinch all the strands and will
thus make only a partial and loose contact
type of termination should be used.
the terminals as these may produce a short circuit due to the close vicinity of the plus and
minus terminals.
Type ANN fuses with Fuse Block 4164 made
Distance up to 4'
Distance up to 6'
# 6 AWG
# 4 AWG
Do not insert the stranded bare end of
. For thicker cables, a suitable adapter with pin
There should be no stray wire strands protruding from
Page 21
Battery fuse
50 A (ANN 50)
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