Battery Requirements For Dual Inverter Systems; Table 2-3 Battery Cable To Maximum Breaker/Fuse Size - Xantrex SW 2524 - REV A Owner's Manual

Trace™ Fuse Block
(TFB)

Battery Requirements for Dual Inverter Systems

Dual Inverters
(not stacked)
Series Stacked
976-0043-01-01

Table 2-3 Battery Cable to Maximum Breaker/Fuse Size

Cable Size Rating in
Required Conduit
#2/0 (00) AWG 175 Amps
#4/0 (0000) AWG 250 Amps
a. The term "free air" is defined by the NEC as cabling that is not enclosed
in a conduit or a raceway. Cables enclosed in conduit or raceways have
substantially lower continuous current carrying ability due to heating
factors.
b. The NEC allows rounding to the next highest standard fuse size from the
cable rating (i.e., 150 amp cable size rounds up to a standard 175 amp
size).
Some installations may not require conduit or a disconnect device,
although overcurrent protection is still required. Xantrex offers a fuse
block (TFB) providing the code required inverter overcurrent protection
for these applications. These fuses are available in 110, 200, 300 and 400
amp sizes.
Important: From this point on in this manual, any reference made to a
"DC disconnect" means either a DC breaker or a fuse with a disconnect
switch, which will depend on your specific type of installation.
The success of "stacked" or "dual" inverter systems is very dependent on
the quality and maintenance of the DC connections. Stacked inverter sets
are far less forgiving to long, undersized, uneven, and/or poor connections
than are single inverters. You cannot run two stacked inverters each from
separate battery banks.
Dual inverter configurations can be used without using the stacking
interface cable. In this configuration, two inverters separately run isolated
loads from the same battery bank or individual battery banks.
When inverters are "stacked" they must have a common battery bank to
operate from. In other words, the DC negative of one inverter must be
common with the second inverter and likewise for the DC positive.
For example:
If you have eight 6-volt batteries in a 24-volt configuration, they
would be arranged in two rows of four batteries (see
diagrams of various arrangements).
Pre-Configuration Planning
Rating in
Maximum
"Free
Breaker/
a
Fuse Size Air"
175 Amps 265 Amps
250 Amps 360 Amps
Maximum
Breaker/
Fuse Size
b
300 Amps
b
400 Amps
Appendix C for
2–15