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All batteries can be maintenance free, but not
all of them are deep-cycling batteries. Beware
of batteries that are described as
maintenance free only. These batteries have
calcium alloyed with the lead and hold the
liquid electrolyte in a sponge-like material. They
are sealed and water cannot be added. Do not
confuse them with true gel cell or AGM
batteries—they will not hold up well to deep
discharging and repeated cycling.
Gel Cell Batteries
Gel cell batteries are lead-acid batteries similar
in many ways to the common wet cell battery,
but differences in the chemistry and
construction provide some unique features.
• No maintenance
• Low self-discharge rate
• Low internal resistance
Even though gel cells are sealed batteries, the
battery compartment should still be ventilated.
Advanced AGM (Absorbed Glass Mat)
Batteries
This battery is lead acid but maintenance-free.
The performance is similar to gel cell batteries.
The charge parameters are similar to wet cell
batteries.
Battery Selection
The most important feature to consider in
making your battery selection is to select true
deep-cycle batteries rated in amp hours (Ah)
and sized to match your power requirements.
BATTERIES
BATTERY INTERCONNECTION
In most cases, you will be using a bank of two
or more batteries with your inverter
/charger.
You may connect batteries together in two
configurations, series and parallel, depending
on their voltage.
Series
Connecting two batteries in series will double
the voltage of the battery bank. For instance,
two 6-volt batteries connected in series will
produce 12 volts. The amp-hour capacity of
the battery bank will be the same as each
individual battery. For example, two 6-volt 220
amp-hour batteries in series will produce one
12-volt 220 amp-hour battery bank.
Series
+
+
+
Series Increase Voltage
EACH BATTERY
CAPACITY:
220
AMP HOURS
@ 6 VDC
TOTAL BATTERY
BANK CAPACITY:
220
AMP HOURS
@ 12 VDC
6V
6V
+
+
_
_
+
_
12V INVERTER