Battery Charging; Charge Current; Table 2 Charge Currents For Radian Models - OutBack Power GS8048A Operator's Manual

Battery Charging

IMPORTANT:
Battery charger settings need to be correct for a given battery type. Always follow battery
manufacturer recommendations. Making incorrect settings, or leaving them at factory default
settings, may cause the batteries to be undercharged or overcharged.

Charge Current

Batteries or battery banks usually have a recommended limit on the maximum current used for
charging. Often this is calculated as a percentage or fraction of the battery capacity,
represented by "C". For example, C/5 would be a DC amperage figure that is 1/5 of the total
amp-hours of the bank.
Any chargers must be set so that the peak charge current does not exceed the recommended
maximum. If multiple chargers are present (including other chargers besides the Radian), this
calculation must accommodate the total combined current. The Radian's charger may need to
be set at less than maximum. The system display can be used to change charger settings.
IMPORTANT:
Although the recommended current is generally represented in DC amperes (Adc), the Charger AC
Limit setting is measured in AC amperes (Aac), which use a different scale. To convert the
recommended DC current into a usable AC figure, divide the DC figure by 4 and round up. The result
can be used as a charger setting for the Radian inverter.
Examples:
1. Bank consists of 8 x L16 FLA batteries in series. Recommended maximum charge current is 75 Adc.
75 ÷ 4 = 18.75 or 19 Aac.
2. Battery bank consists of 12 x OutBack EnergyCell 200RE VRLA batteries in series/parallel.
Recommended maximum charge current is 90 Adc.
90 ÷ 4 = 22.5 or 23 Aac.
The maximum DC charge rate for Radian models is specified in Table 12 on page 57. The
actual Charger AC Limit setting is available in the AC Input and Current Limit menu of a
MATE3-class system display. See Table 17 on page 63. These numbers are also summarized
in Table 2 below. NOTE : This table does not match the calculations above due to other
factors in charging.

Table 2 Charge Currents for Radian Models

Model Maximum DC Output (sent to battery)
GS8048A 115 Adc
GS4048A 57.5 Adc
Charge Current for Multiple Inverters
If Radian inverters are stacked, the master inverter Charger AC Limit setting is used by all
other inverters. Divide the total AC current by the number of chargers used and program the
master with the result. The master will operate all chargers with this setting to achieve the
maximum total charge current. The system display has a global Charger Control command of
On which enables all available chargers.
900-0161-01-01 Rev B
Maximum AC Input (used from source)
30 Aac
15 Aac
Operation
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