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iSustain Australia sells
a range of 12V, 24V and
48V battery chargers designed for remote
power, commercial, marine, rural, military, communications,
mobile and mining applications worldwide. They are suitable
for all battery types including flooded,
Battery Charger Information
Battery chargers come in
many different sizes and brands and vary a great deal in
intelligence. However, there are three major types –
One-stage, two-stage and three-stage
A three-stage battery charger is
preferred for idle or “unloaded” batteries
Without loads during charging, the three-stage charger provides
a more complete recharge. It charges the
battery at a constant current until the battery voltage
reaches a slightly elevated level. The battery is maintained
at this voltage while the charging current diminishes to
a low value, and then the battery is switched to the float
voltage where it can be maintained indefinitely.
A two-stage battery charger is preferred
for “loaded” batteries because its circuits
cannot be “fooled” into pushing a higher “absorption"
voltage than required for charging. A two-stage charger
provides a constant current until the battery reaches its
rated capacity and then switches to a “float”
voltage. The current then reduces as necessary to maintain
the battery at the float voltage. The charger can be connected
to the battery indefinitely.
The ordinary one-stage charger you buy from the local auto-parts
store is inexpensive, but it charges slowly and cannot completely
re-charge a battery to its rated capacity. One-stage chargers
can easily damage the battery by warping its plates or boiling
it dry, effectively destroying it. iSustain Australia does
not sell these battery chargers.
It is recommend to charge batteries at about 10% of their
amp hour capacity. For example, an 80Ah deep cycle battery
should be changed at a rate of about 8A.
SLA, AGM and Gel batteries are traditionally charged at
a lower voltage than Flooded Lead acid batteries.
Multi-stage chargers are recommended because
they adjust current and voltage according to the battery's
Multistage charging ensures batteries receive optimum charging,
but with minimal wear and tear, regulating the voltage and
current delivered to the batteries in three automatic stages
Bulk, Absorption, and Float:
1. Bulk - Replaces 70-80% of the battery’s state of
charge at the fastest possible rate.
2. Absorption - Replenishes the remaining 20-30% of charge,
bringing the battery to a full charge at a slow, safe rate.
3. Float - Voltage is reduced and held constant in order
to prevent damage and keep batteries at a full charge.
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