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Step 4: Wiring the Inverter
975-0239-01-01 2–9
Batteries
See the FAQs section of the Xantrex Web site for information on determining battery bank
requirements.
Consider the following recommendations for battery use.
• Use only the deep discharge types for inverter applications.
• Use the same battery type for all batteries in the bank.
• Use only batteries from the same lot and date in your battery bank. This information is
usually printed on a label located on the battery.
Battery Bank Requirements
The DC voltage of the inverter must match the nominal voltage of the system and all
battery-connected devices. If the inverter is a 24-volt inverter, then the battery bank and all
battery-connected devices in the system need to be configured for 24 volts.
Battery Cable Requirements
Battery cable length Runs should be kept as short as practical. Length should not exceed 10 feet (3 m). For best
performance, the positive and negative cables should run alongside each other. Avoid
cable loops.
Battery cable lugs Battery cables must have crimped copper compression lugs or crimped and soldered
copper compression lugs. Soldered connections alone are not acceptable. Lugs must be
rated for use with fine-stranded cable.
Overcurrent
protection
For safety and compliance with regulations, battery overcurrent protection is required.
Fuses and disconnects must be sized to protect the wiring in the system and are required to
open before the wire reaches its maximum current carrying capability.
CAUTION: Damage to Equipment
The XW Inverter/Charger is intended to operate with batteries as its source of DC power. Do not
connect DC power sources, such as PV arrays, wind turbines, or micro-hydro turbines, directly to
the XW Inverter/Charger without a battery. Connect DC power sources to a charge controller such
as the XW Solar Charge Controller instead. If DC power sources are connected directly to the
inverter, the DC rating of the inverter can be exceeded and the inverter can be damaged.
Important: The minimum recommended battery bank is 100 Ah. The inverter is designed to
operate with batteries and should not be operated without them. Also, do not allow the battery
bank to become completely discharged. If the voltage of the battery bank falls below 10 volts, the
XW Power System will not operate.
WARNING: Fire Hazard
Undersized cables can overheat and melt, creating a fire hazard when subjected to heavy (peak)
loads. Always use a cable of proper size and length, rated for the amperage of the inverter and
batteries.
Important:
Use only fine-stranded copper cables for battery and inverter DC connections. Do
not use coarse-stranded wire, as the lack of flexibility may damage battery and inverter terminals.