Selecting A Dc Input Fuse Or Circuit Breaker - Xantrex XPower Inverter 3000 Installation Manual

Selecting a DC Input Fuse or Circuit Breaker

DC Input Cables
Keep all cables as short as possible, and ensure that each
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cable between the XPower inverter and the battery is no
longer than 10 feet (3 m).
Do not use aluminum cable. It has about 1/3 more
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resistance than copper cable of the same size, and it is
difficult to make good, low-resistance connections to
aluminum wire.
Some installation codes require and we recommend use of
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oil-resistant cable rated for damp or wet locations.
For installations subject to the US NEC, the minimum cable
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size required is No. 4/0 AWG 75 °C, with a maximum fuse
size of 400 Adc.
For other installations, other codes may apply, but in no
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case should you use DC cables smaller than No. 2/0 AWG,
protected by a 250 Adc fuse, but note that the five-minute
3000 W rating requires a 350 Adc fuse, which will require a
minimum No. 4/0 AWG cable.
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Selecting a DC Input Fuse or
Circuit Breaker
The DC cables from the battery to the XPower inverter need to be
provided with overcurrent protection, in the form of a fuse or circuit
breaker, located as close as possible to the DC positive battery
terminal.
Because your batteries can provide thousands of amps of short-
circuit current, you need a DC-rated fuse or circuit breaker that
can safely interrupt the short-circuit current that the batteries can
produce.
Xantrex XPower 3000 Installation Guide