5.3 Use instructions for deep discharged batteries
We would like to call your attention to an operational situation which can
lead to a deep discharge of the batteries in unfavorable circumstances. In
the operation mode, "priority of the charge source" under "only PV charge
operation" (menu point 16), the following situation can
occur
.
The load output switches from inverter operation to the bypass mode after
the defined threshold falls short, but the batteries will continue to discharge
through the internal consumption of the inverter. To ensure that the
batteries will not totally discharge in this operation mode, a battery
charging automatically starts via the mains power supply (although only PV
charging operation is selected) when the battery voltage falls below 10V
per battery
block
.
In the following situation, the automatic battery charging is not performed
and can lead to a complete discharge of the
batteries
:
*
When there is no mains voltage or when a phase is missing from the 3-
phase
system (the voltages must be within the range of 170V – 280V AC).
Without supply
voltage, the mains charging device cannot carry out the
charging
.
*
When the PV voltage is present but the modules do not emit a PV output
(e.g. very cloudly weather, snowy, etc.)
With the presence of the voltage from the PV modules, the inverter awaits
a battery charge from the PV module, thus it does not begin the automatic
battery
charge
.
Because the PV module is not emitting any output, the batteries will
continue to discharge through internal consumption during this period.
We recommend completely shutting down the AX inverter during periods
in which no PV outputs are expected (switch off AC input fuse, switch off
PV input and remove the battery fuse), at least the PV modules should be
switched off. Please note that the batteries are completely charged
before a long period of being shut
down
.
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