Statpower Portawattz 3000, Owner'S Manual, Page: 18 / 36

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If you are using different
batteries, or need to use more
than two batteries, we
recommend that you set up
two separate battery banks
and use them alternately.
Battery selector switches are
available from marine and RV
dealers which allow you to
select between two banks of batteries, or use both in parallel,
or disconnect both from the load (see Figure 8).
5.2.4. Battery Tips
1. With the exception of sealed batteries, lead-acid batteries
emit hydrogen and oxygen gases, and sulfuric acid fumes
when recharging. Vent the battery compartment to prevent
accumulation of these gases, and do not install electronic
or electrical equipment in the battery compartment. Do
not smoke or carry an open flame when working around
batteries.
Figure 7. Parallel Batteries
Figure 8. Configuration for heavy-duty Applications