Application Note - Paralleling Batteries

DANGER
HAZARDOFFIRE,ELECTRIC SHOCK,EXPLOSION,OR ARC FLASH
This Paralleling Xantrex Batteries Application Note is in addition to, and incorporates by reference, the relevant product manuals for each product in the power system. After reviewing this guide you must read
the relevant product manuals. Unless specified, information on safety, specifications, installation, and operation is as shown in the primary documentation received with the product. Ensure you are familiar with
that information before proceeding.
Failure to followthese instructionswillresult in death orseriousinjury.
Application
When paralleling more than two Xantrex Batteries (105Ah, 125Ah, or 240Ah), you must install:
n Identical DC bus bars [A] (for NEG- and POS+) which can carry 100% of the maximum current draw of the system.
n The same length of batterycable [B] connecting from the DC bus bar to the battery terminal.
n The same length of batterycable [C] connecting from the DC bus bar to the DC terminal of the next device.
n A suitable DC breaker [D] (alternatively, a fused DC disconnect device) based on the current rating (ampacity) of the
DC cables and bus bars.
A
B
B
B
B
B
C
C
D
D
D
B
A
Additionally, you must ensure that:
n The measured voltage difference between each battery (measured from the terminals) shall not be greater than
100mVDC. This shall be measured during:
l a maximum recharge scenario,
l a maximum discharge scenario, and
l an at rest scenario while the batteries are at the same SOC.
n The voltage from the charge source to the batteries shall have a voltage drop measured at the highest terminal
voltage of no more than 100mVDC.
Paralleling Xantrex Batteries Application Note
976-0456-01-01
Rev A