Projecta INVCHR2 Manual page 10

2.3.4 Lithium Battery Compatible
Projecta Inverter Chargers support universal LFP charging profile and offered pre-defined LFP charging
profile for Projecta HD series lithium batteries.
Built in BMS pre-defined LFP charging and communication for LBXXX-HD series batteries.
According to cell temperature and real time SOC, BMS will send commands to battery charger asking for
optimum charging voltage and current. This synchronization will prevent overheating or overcharging
especially at the end of charging, to extend the life of the battery.
Instead of using voltage as protection, SOC value is used to avoid permanently damaging of lithium
batteries due to being left discharged for long time.
2.3.5 AC Transfer Switch
In case of poor AC mains power (due to poor voltage/ frequency or waveform characteristic, the Inverter
Charger will switch to inverter and battery power.
In case of AC mains failure or exceeding the maximum AC input current set by the user, the Inverter
Charger will initiate a quick switch to inverter, which will guarantee continuous power. When stable AC
power is resumed, the inverter charger will switch back to AC mains power after a 5 second delay. Due to
its ultra quick transfer design, as quick as 0ms. The Inverter Charger could be used as a UPS.
Ground Relay
The neutral output of Inverter Charger is automatically connected to earth upon no external AC sources
are available. Once external AC sources present, the ground relay will open. The Ground relay is required
for the RCD to function correctly.
Figure 2-7 Ground Relay Schematic
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