Product Manual

Specifications
900-0161-01-01 Rev B 61
Limiting Charge Current
(Multiple Inverters)
It is not advisable to set
Charger AC Limit
less than 12 Aac in a stacked system. The Power
Save function requires the master to activates the slave chargers in sequence only when the
charge current exceeds 11 Aac. If the setting is less than 12,
Power Save
will not activate any
other chargers. For more information on this function, see the
Power Save
section of the
Radian Series Inverter/Charger Installation Manual
.
When the
Charger AC Limit
setting is 12 Aac or more, other active chargers add the same
amount to the total. The total current equals the
Charger AC Limit
setting times the number of
active chargers. In some systems, lower currents may be required due to battery bank size or
other reasons. To achieve lower currents, chargers can be individually set to
Off
so that the
master inverter does not activate them. (The global
Charger Control On
only enables inverters
not individually set to
Off
.) Combining the charger limit settings with a reduced number of
chargers allows better control over the current.
In Table 15,
Max Charge Adc
shows examples of DC charging values which may be
recommended for a battery bank.
Aac
converts these values into AC amperes.
On
provides recommendations for the smallest number of chargers.
Set
recommends the
Charger AC Limit
setting. Note that this table specifies the number of chargers to leave
on.
This will achieve the possible closest charging output to the number specified in
Aac
without
exceeding it. All other chargers should be turned off using the
Charger Control
menu item.
(See the menu tables beginning on page 63 to locate this command in the menu structure.)
The lowest
Adc
figures in this table allow for a single inverter to perform all charging. All
other inverters would be turned off. The highest
Adc
figures are for the maximum of ten
stacked chargers.
The recommended settings ensure the charging will not exceed a designated current. The
amount is likely to be less.
To determine the chargers and settings using Table 15:
1.
Obtain the battery bank’s maximum charge current (in Adc) from the battery manufac
turer.
2.
Locate the closest number to this amount (rounded down) on Table 15
.
3.
Read across to the entry
for the appropriate inverter model.
4.
Adjust the master inverter’s
Charger AC Limit setting to the designated amount (in Aac).
5. Turn off the chargers for all inverters that exceed the number shown as
On.
In a stacked
system (using the HUB communications manager), chargers on higher-
numbered HUB ports should be turned off first. Slave chargers should be turned off
before
turning off a
ny subphase masters. (See the Installation Manual for information on stacking.)
Calculating Limits
If other numbers are ne
eded than those featured in Table 15, the results can be calculated.
Do not use the calculations on page 27, due to charger efficiencies and other factors.