Xantrex Technology FREEDOM SW 3000 - Manual (Page 17)

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Introduction
How the Freedom SW 3000 Inverter/Charger
Works
The Freedom SW 3000 is designed to:
• invert,
• charge, and
• accept both split phase and dual input.
With AC input available from the utility grid or a generator, power is passed
through the Freedom SW 3000 Inverter/Charger to operate connected AC
loads. The remaining AC power not used by loads is converted to DC
power and used to charge batteries.
If AC input power becomes disconnected, fails, or falls out of specification
and is no longer qualified as good AC, a quick transfer takes place and the
Freedom SW 3000 begins converting DC power from the batteries into AC
power, to continue to supply power to the AC loads.
Inverting
The Freedom SW 3000’s inverting function produces 120 volts AC from
your batteries at 3000 watts continuous with 6000 watts of surge power to
start loads like pumps and refrigerators.
Charging
The Freedom SW 3000’s charging function:
• produces 150 amps to charge your batteries, and
• equalizes flooded, lead acid batteries.
Built-in Charge Formulas For the unit to perform at the highest level,
the batteries must be charged correctly. The Freedom SW 3000 has
optimized algorithms for flooded, gel, and AGM batteries.
Battery Temperature Sensor Since battery temperature is a key factor
in correct charging, the charging formula must be adjusted (automatically
and in real time) according to the actual battery temperature to ensure that
batteries are fully charged, but not overcharged. For this reason, Xantrex®
has included a battery temperature sensor with your Freedom SW 3000 and
has temperature compensated the charge formula.
Manual Equalization Over a period of time, the cells in a flooded
battery can develop uneven chemical states. This can result in a weak
(undercharged) cell which, in turn, can reduce the overall capacity of the
battery. To improve the life and performance of a non-sealed, flooded
battery, the Freedom SW 3000’s multi-stage charging cycle includes a
manual equalize mode that can be used, if recommended by the battery
manufacturer.
Dead Battery Charging Another feature that the Freedom SW 3000
includes is dead battery charging. The Freedom SW 3000—unlike many
chargers—has the ability to recharge batteries even if the battery voltage is
very low, i.e., as low as 5 volts.