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This type of battery is not recommended for the storage of energy for inverter
applications. However, they are recommended as starting battery for the back-up
generator.
Deep Cycle Lead Acid Batteries
Deep cycle batteries are designed with thick-plate electrodes to serve as primary
power sources, to have a constant discharge rate, to have the capability to be deeply
discharged up to 80 % capacity and to repeatedly accept recharging. They are
marketed for use in recreation vehicles (RV), boats and electric golf carts – so they may
be referred to as RV batteries, marine batteries or golf cart batteries.
Units of Battery Capacity – Ampere Hours (AH) and Reserve Minutes (RC)
The battery capacity is the measure of the electrical energy the battery can store
and deliver to a load. It is determined by the amount of current any given battery can
deliver over a stipulated period of time. The energy rating is expressed in Ampere
Hours (AH). As a bench mark, the battery industry rates batteries at 20 Hour rate i.e.,
the number of Amperes of current the battery can deliver for 20 Hours at 80 ºF (26.7 ºC) till
the voltage drops to 10.5 Volts for 12 V battery and 21 V for 24 V battery. For example,
a 100 AH battery will deliver 5 Amperes for 20 Hours.
Battery capacity is also expressed as Reserve Capacity (RC) in minutes. Reserve
capacity is the time in minutes for which the battery can deliver 25 Amperes at 80 ºF
(26.7 ºC) till the voltage drops to 10.5 Volts for 12 V battery and 21 V for 24 V battery.
Approximate relationship between the two units is as follows:
Capacity in AH = Reserve Capacity in RC minutes x 0.6
Typical Battery Sizes
The Table below shows details of some popular battery sizes:
BCI* GROUP
27 / 31
4 D
8D
GC2**
* Battery Council International
GENERAL INFORMATION: BATTERIEs
BATTERy VOLTAGE, V
12
12
12
6
** Golf Cart
Table 3.1. Popular Battery Sizes
BATTERy CAPACITy, AH
105
160
225
220
3
19
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