Battery Types and Sizes

Using Multiple Batteries

As your power requirements increase, you may need to use more than one battery to obtain sufficient capacity. Read “Two Batteries Connected In Parallel” and “Two Separate Battery Banks” to determine whether two batteries or two battery banks are more appropriate for your applications.

Two Batteries Connected In Parallel

Two identical batteries can be connected positive (+) to positive (+) and negative (–) to negative (–) in a parallel system. A parallel system doubles capacity and maintains the voltage of a single battery.

Figure 3-1 on page 3–2“Configuration for Normal Loads” shows a battery configuration suitable for normal loads.

Figure 3-2 on page 3–3“Configuration for Heavy Loads” show a battery configuration that is recommended for heavy loads.

CAUTION

Do not connect the following in parallel:

•batteries made by different manufacturers

•different types of batteries

•batteries that have different Ah ratings

Decreased battery life and improper charging will result.

Two Separate Battery Banks

If you need more than two batteries (or are using different makes or models of batteries), Xantrex recommends that you install two separate battery banks and a battery selector switch.

Figure 3-2 on page 3–3“Configuration for Heavy Loads” shows two separate battery banks and a battery selector switch. This configuration is recommended for heavy-duty applications.

By installing a battery selector switch, you can select between the two battery banks, use both banks in parallel, or disconnect both banks from the load. Battery selector switches are available at marine and RV dealers.

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