© 2010 Magnum Energy, Inc.
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3.0 Setup
Example:
The charger is rated for 120 amps, and you need to limit the
charge rate to 72 amps. Choose the
Max Charge = 60%
selection (72
amps = 60% of 120 amps)
.
Default setting
-
Max Charge Rate = 100%
Info:
If the
Max Charge Rate
setting is
0%
, the topology of the
Magnum inverter (when connected to an AC source) will override
the 0% setting and start charging if the battery voltage is <12
VDC (12 VDC models), <14 VDC (24-volt models), or <28 VDC
(48-volt models).
How do I determine where to set my maximum charge rate?
The
maximum charge rate is generally set to a C/5* rate (C = the total amp-
hour capacity of the battery bank – using the 20-hour AH rate). The C/5 rate
is usually used when the objective is to charge the batteries as quickly as
possible (i.e., 400 AH ÷ 5 = 80 amp maximum charge rate). A lower rate such
as C/20* is used when the batteries need to be charged as slow as possible.
* C/5 or C/20 rate - charge rates are commonly expressed as a ratio of the total
amp-hour (AH) capacity of the battery bank. For example, with a 400 AH battery
bank (C = 400), the C/5 charge rate is 80 A (400/5 = 80 A).
CAUTION:
The C/5 or C/20 charge rate settings are guidelines;
they are not requirements on how you should set your battery
charge rate. For speci
fi
c charge rate requirements, refer to your
battery manufacturer.
Info:
If multiple inverter/chargers are used on a single battery
bank, you must ensure that the total charge rate from all
inverter/chargers is limited to the maximum charge rate needed
for your battery bank. The
Max Charge Rate
setting only limits
the charging on each inverter/charger individually, not on all
inverter/chargers.
03D Low VAC Dropout:
Selects the minimum AC voltage that must be
present on the input before the inverter/charger switches from Inverter
mode to Charger mode.
This setting also determines the minimum AC voltage threshold where
the charger disengages and the inverter (when turned on) provides AC
power from the batteries. This protects AC loads from utility outages.
Example:
If this value is set to 60 VAC, then the AC input voltage must
be above 60 volts before the inverter will switch from Inverter mode to
Charge mode.
Default setting
-
80 VAC
(Export inverter models 160 VAC)
Where do I set my VAC Dropout?
It depends on the application and what
you are using as the AC source. The settings not only look at the incoming
voltage level to determine when to transfer, but also determines how quickly
the charger disconnects and starts inverting based of the
fl
uctuations of the
incoming AC voltage.
Dropout = 60 VAC to 100 VAC (For export models: Dropout = 120
VAC to 200 VAC)
-
Use a
Low VAC Dropout
setting of 60 VAC to 100 VAC
(export models: dropout from 120 VAC to 200 VAC) when the AC source
may have
fl
uctuations in RMS voltage. These settings attempt to prevent
the charger from disengaging unnecessarily due to poor quality voltage
and are highly recommended if using a generator for charging. The
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