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7.1 GENERAL
Lead-acid batteries can be categorized by the type of application:
1.
Automotive service - Starting/Lighting/Ignition (SLI, a.k.a. cranking), and
2.
Deep cycle service.
Deep Cycle Lead Acid Batteries of appropriate capacity are recommended for powering
of inverters.
7.2 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 dis-
charged 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. Use Deep Cycle batteries for
powering these inverters.
7.3 RATED CAPACITY SPECIFIED IN AMPERE-HOUR (AH)
Battery capacity “C” is
in Ampere-hours (Ah). An Ampere is the unit of measure-
-
cal conductor in one second. The Capacity “C” in Ah relates to the ability of the battery to
provide a constant
value of discharge current (also called “C-Rate”: See Section 7.6)
voltage (Also called “End Point Voltage”) at a
temperature of the electrolyte. As a
benchmark, the automotive battery industry rates batteries at a discharge current or C-Rate
of C/20 Amperes corresponding to 20 Hour discharge period. The rated capacity “C” in Ah
in this case will be the number of Amperes of current the battery can deliver for 20
Hours at 80ºf (26.7ºC) till the voltage drops to 1.75V / Cell. i.e. 10.
7
V for 12V battery,
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.4
V for 24V bat-tery and 42V for a 48V battery. For example, a 100 Ah battery will
deliver 5A for 20 Hours.
7.4 RATED CAPACITY SPECIFIED IN RESERVE CAPACITY (RC)
Battery capacity may also be expressed as Reserve Capacity (RC) in minutes typically for
automotive SLI (Starting, Lighting and Ignition) batteries. It is the time in minutes a
vehicle can be driven after the charging system fails. This is roughly equivalent to the
conditions after the alternator fails while the vehicle is being driven at night with the
headlights on. The battery alone must supply current to the headlights and the com-
puter/ignition system. The assumed battery load is a constant discharge current of 25A.
SECTION 7 |
General Information on Lead Acid
Batteries
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Summary of Contents for PST-300S-12E
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