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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. For 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 properly sized wire and
terminals for your interconnecting battery
cables. For size information refer to NEC
requirements or contact your local
electrician.
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 rate. 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 decreased.
For example, if the load is increased to 100
amps, only about 45 amp hours will be avail-
able at this rate of discharge.
Deep-cycle batteries can be discharged about
80% of capacity before damage occurs.
Shallow cycling will result in much longer
battery life. Calculating a battery bank size
based on 50% discharge cycling is generally
considered to be a good compromise between
long battery life and size.
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12V
12V
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1
2V INVERTER
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