Samlex America PST-15S-24A - Manual (Page 22)

Page 21
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.
Type ANN fuses with Fuse Block 4164 made
by Bussmann are recommended.
The following size of cables and fuse 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 )
Distance up to 2’ Distance up to 6’ Ampere rating of fuse
PST-15S-12A # 12 AWG #10 AWG 20 A (ANN20)
PST-15S-24A # 14 AWG #12 AWG 10 A (ANN10)
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 + fuse inverter + inverter - 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.
DC Input Connection
For connecting the DC input, an attached 2' cable with a cigarette lighter plug has been
provided. The cable size is AWG #14.
NOTE: The centre pin of the cigarette lighter plug is positive.
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