NorthStar NSB BLUE+
Batteries
900-00264-01-001 Rev A
9
Battery Configurations
Figure 6
Series String Configurations
Figure 7
Parallel String Configuration
Series String (24 Vdc)
Series String (48 Vdc)
Load +
Load –
Load +
Load –
Batteries are placed in series (negative to positive) for additive voltages. Batteries in series are known
as a “string”. A string of two NorthStar NSB BLUE+
®
batteries has a nominal voltage of 24 Vdc and
can be used for 24-volt loads. A string of four has a nominal voltage of 48 Vdc. Other voltages are
possible. However, batteries in series do not have additive amp-hours. A single string of any voltage
(as shown above) has the same amp-hours as a single battery.
When replacing batteries, a new battery should not be placed in series with old batteries. This will
cause severe stress and shorten the life of all batteries. All batteries in a string should be replaced at
the same time.
Batteries are placed in parallel (positive to positive,
negative to negative) for additive amp-hour capacity.
Three batteries in parallel have three times the
amp-hours of a single battery. However, batteries in
parallel do not have additive voltages. A single set of
batteries in parallel (as shown in this figure) have the
same voltage as a single battery.
NOTE
:
Use caution when designing or building
systems with more than three NorthStar NSB BLUE+
®
batteries or strings in parallel. The extra conductors
and connections used in larger paralleled systems can
lead to unexpected resistances and imbalances
between batteries. Without proper precautions, these
factors will reduce the system efficiency and shorten the
life of all batteries. For systems beyond three strings,
contact an OutBack representative.
Parallel Batteries
Load Bus +
Load Bus –
