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Both of these items were introduced in firmware revision 1.03 for XW inverter chargers.
RPO Remote Power Off.
RPO enables or disables the remote power off function.
Enable this setting if an external shut-off switch has been connected to the
XW Inverter/Charger Aux port. See the XW Power System Installation
Guide for more information about the Aux port.
When enabled, Power Save mode can reduce tare loss from the battery by
reducing output from 240 volts to 220 volts when the loads are less than 100
watts. When the XW Inverter/Charger detects loads higher than 100 watts,
the inverter/charger produces the full 240 volts. Power Save mode is
disabled by default.