Before Getting Started

  • Make sure you know your system voltage, battery compartment size (length, width and height) and your energy needs.

  • Determine whether you want to use a deep-cycle flooded, AGM or Gel battery.

Step One: Determine your battery voltage and how many to use.

1-1 Based on your system voltage, you must first decide which battery is needed and how many to use in order to meet your requirements. For example, you may connect a series of eight 6V batteries, six 8V batteries or four 12V batteries for a 48-volt system. The size of your battery compartment, your performance requirements and costs may limit your options.

1-2 Make sure there is enough space between batteries to allow for minor battery expansion that occurs during use and to allow proper airflow to keep battery temperature down in hot environments.

TIP: Connecting batteries in series does not increase the capacity of the batteries; it simply increases the overall voltage to meet your system requirements. Once your voltage requirements are met, if space allows you can double the batteries in a parallel connection, thereby doubling your battery capacity. See diagrams below.

Series Connect

To increase voltage, connect batteries in series.
This will not increase the system capacity.

Example:
Two T-105, 6V Batteries rated at 225AH

Connected in Series
System Voltage: 6V + 6V = 12V
System Capacity = 225AH

To increase voltage, connect batteries in series.

Parallel Connect

To increase capacity, connect batteries in parallel.
This will not increase the system voltage.

Example:
Two T-105, 6V Batteries rated at 225AH

Connected in Parallel
System Voltage: 6V
System Capacity = 225AH + 225AH = 450AH

To increase amp-hour capacity, connect batteries in parallel.

Series/ Parallel Connect

To increase both voltage and capacity, connect additional batteries in series and parallel.

Example :
Four T-105, 6V Batteries rated at 225AH

Connected in Series/Parallel
System Voltage: 6V + 6V = 12V
System Capacity = 225AH + 225AH = 450AH

To increase both voltage and amp-hour capacity, connect batteries in series/parallel.

Step Two: Choose your best battery model

2-1 When choosing your battery model, first consider your battery compartment space as this may limit your options. Within your size restrictions you may have several battery options to choose from. For example, you can use a T-605, T-105 or T-125 in the same space, as they are the exact same physical size. The difference between these batteries is the amount of energy they have to offer. 2-2 Next consider your energy needs. If replacing an existing battery, use it as a reference point. If your old battery provided enough energy, it can be replaced with a similar capacity battery. If you need more energy you can size up, or if you need less energy you can size down.

Step Three: Select your best terminal

3-1 Finally determine which terminal option best meets your needs based on the type of cable connections you plan to use. Look for the terminal(s) available for the battery you have selected.