Renogy Off-Grid Kit, General Manual

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Battery Configurations
The battery system can also be configured to create a “bank” of batteries. In this section, we cover
the most basic configurations. When wiring batteries, extreme attention should be given. Never
short a battery, as high currents can cause severe burns or even death.
Hazards!
It is recommended that insulated/non-conducting tools be used when
working with batteries. Never leave tools on top of the battery. Always wear
eye protection. Never touch both of the battery terminals at the same time
with your bare hands.
9.1 Series connection of batteries (12V)
Figure 9.1 Two 6V batteries connected in series
When two or more batteries are connected in a series, their voltages add up, but the Amp-Hour
(AH) capacity remains the same.
Fig. 9.1 shows two 6V batteries in series. For example, say
each battery has 225 Ah. This wiring will form a 12V battery bank with a capacity of 225 Ah. Notice
that the cables connecting the batteries in series are of heavier gauge than the ones coming from
the controller. These cables have to be of heavier gauge because when power is drawn from an
inverter, it involves large amounts of current. This interconnection cable is often sized according
to the power of the inverter.