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Pre-Configuration Planning
976-0043-01-01 2–15
Trace™ Fuse Block
(TFB) 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.
Battery Requirements for Dual Inverter Systems
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 Inverters
(not stacked) 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.
Series Stacked 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
Appendix C for
diagrams of various arrangements).
Table 2-3 Battery Cable to Maximum Breaker/Fuse Size
Cable Size
Required Rating in
Conduit
Maximum
Breaker/
Fuse Size
Rating in
“Free
Air”
a
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.
Maximum
Breaker/
Fuse Size
#2/0 (00) AWG 175 Amps 175 Amps 265 Amps
300 Amps
b
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).
#4/0 (0000) AWG 250 Amps 250 Amps 360 Amps
400 Amps
b
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.