Xantrex Technology Xantrex Battery Monitor - Manual (Page 11)

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much since it is a momentary readout and must be used as a guide
only. We always encourage the use of the state-of-charge readout for
accurate battery monitoring.
Besides the main function of the Xantrex Battery Monitor—
displaying the actual battery status—this monitor offers other
features. The readout of actual battery voltage, current and
temperature (with optional temperature sensor), the ability to store
history data, the PC computerlink and the Super-lock function are
just a few features of the Xantrex Battery Monitor. These features are
more specifically explained in the corresponding sections of this
manual.
2 Setting up the Xantrex Battery Monitor
Before proceeding with this chapter, please make sure
your Xantrex Battery Monitor is completely installed
according to the enclosed installation guide.
When your Xantrex Battery Monitor is installed it is time to adjust
the battery monitor to your battery system. But before discussing the
functions in the setup menu, four important items are explained in
the next sections. These four items will help you become more
familiar with battery monitoring. The actual setup menu functions
are explained in “Function overview” on page 4.
Charge Efficiency Factor (CEF)
Not all energy transferred into the battery during battery charging is
also available during discharging of the battery. The charge
efficiency of a brand new battery is approximately 90%, meaning
that 10 Ah must be transferred to the battery to get 9 Ah actually
stored in the battery. This efficiency figure is called Charge
Efficiency Factor (CEF) and will decrease with battery age.
The Xantrex Battery Monitor automatically calculates the CEF of the
battery as the battery is discharged. The level at which the CEF is
recalculated is variable and is linked to the discharge floor set in
F05. The CEF algorithm starts operating when 10% of the difference
between 100% and the discharge floor is discharged from a fully
charged battery.