54
Stacking Features
This guide for use by qualified personnel only.
NOTES:
The only situation in which the Slave inverter may shut down
the Master inverter is when fault conditions are detected such
as high or low battery voltage, overcurrent, or over-
temperature conditions. Both inverters will auto reset after a
fault condition has been cleared. The exception is that an
overcurrent condition will generate a shutdown for both
inverters that will require a manual restart of the system.
Search Mode in Series Stacking
When configured for 120/240-volt series stacking, each
inverter/charger operates independently in search mode and
attempts to detect loads connected to its terminals only.
Search Mode Operation in Parallel
Stacking
When two inverter/chargers are stacked for parallel operation,
search mode behavior on the Slave unit is modified and is
dependent on how much total load is on the system.
Disabling Search Mode on the Master Unit
In parallel stacking, search mode on the Master unit will not
function properly. When the Master sends out a load search
pulse, a small current also flows into the output of the Slave
unit since the two outputs are in parallel. This Master unit
falsely detects a load causing erratic search mode operation.
For this reason, it is highly recommended to disable search
mode on the Master unit in a parallel stacking system.
Setting Search Mode on the Slave Unit
The Slave unit will behave in one of two ways depending on
whether its search mode is enabled or disabled.
Search mode enabled
This is the recommended mode for
parallel stacking and it helps minimize battery draw. The
Slave unit continuously monitors the output of the Master
unit. If the Master unit has more than 60% of the rated load
(e.g., 1800 watts on
$XWR3RZHU
), the Slave unit will
assist the Master and the two will share the load equally.
Should the load on the Master drop below 20% of rated load
(600 watts for
$XWRSRZHU
), the Slave unit disengages
and returns to a waiting state.
Search mode disabled
The Slave unit operates
continuously along with the Master unit and shares the load.
Summary of Contents for 091-269-12-2000
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