Part No. 90-0113-00
Fdmman2.p65 2/98
Parallel
Connecting two batteries in parallel will
double the Amp-hour rating of the battery
bank, while the voltage will be the same as
each individual battery. Example, two 12 Volt
105 Amp-hour batteries in parallel will
produce one 12 Volt 210 Amp-hour battery
bank.
BATTERIES
Parallel
Parallel Increase Amp-hour Capacity
EACH BATTERY
CAPACITY:
105
AMP-HOURS
@ 12 VDC
TOTAL BATTERY
BANK CAPACITY:
210
AMP-HOURS
@ 12 VDC
Only similar batteries should be
connected together in one bank. Do not
connect old and new batteries together or wet
and gel cell batteries together. In the above
drawing, the load is connected to the positive
terminal of the first battery and the negative
terminal of the last battery. This practice helps
to balance the battery bank and is called
cross-connecting
the battery bank.
Note: It is not advisable to connect
batteries of different case sizes or Amp-hour
ratings in the same battery bank.
Always use wire and terminals for
your interconnecting battery cables which
are appropriate to handle the current. They
must be the same size or larger AWG as
the cables supplied with the inverter/
charger.
BATTERY BANK RATINGS AND SIZING
Deep-cycle batteries are usually rated in
Amp-hours. The Amp-hour rating is based on
a 20 hour discharge cycle, therefore, a 100
Amp-hour battery can deliver 5 Amps for 20
hours. If the discharge rate is greater than 5
Amps, the available Amp-hours are de-
creased. For example, if the load is increased
to 100 Amps, only about 45 Amp-hours will
be available at this rate of discharge.
Deep-cycle batteries can be discharged
about 80% before permanent damage
occurs, though shallower cycling will result in
much longer battery life. 50% cycling is gen-
erally considered to be a good compromise
between long battery life and a reasonably
sized battery bank.
+
+
12V
12V
+
+
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+
1
2V INVERTER
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