Xantrex Freedom XC2000-230V Owner's Manual page 39

Basic Installation Procedures
heavy load the Freedom XC can draw current surges from the
battery of up to 250A. If the DC wiring is too small the voltage drop
from this surge will result in a voltage at the Freedom XC
terminals that is too low for the Freedom XC to operate correctly.
The Freedom XC may appear to operate correctly with smaller
cables until a heavy load such as a microwave or refrigerator
attempts to start - then the unit may work correctly sometimes
and not work correctly other times.
DC Disconnects and Over-Current Devices
The DC circuit from the battery to the Freedom XC must be
equipped with a disconnect and over-current device. This usually
consists of a circuit breaker, a "fused-disconnect", or a separate
fuse and DC disconnect. Do not confuse AC circuit breakers
with DC circuit breakers. They are not interchangeable. The
rating of the fuse or breaker must be matched to the size of cables
used in accordance with the applicable installation codes. The
breaker or disconnect and fuse should be located as close as
possible to the battery, in the positive cable. Applicable codes
may limit how far the protection can be from the battery.
Batteries
The Freedom XC uses 12 VZ battery banks. Every Freedom XC
system is recommended to have a deep-cycle battery (house) or
group of batteries with a total capacity of 100 Ah or more which
provides the DC current that the Freedom XC converts to AC.
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