VPS-DOS-TR-06-E / Rev 01
3-May-2022
Volta Power Systems
Page 21 of 41
the inverter controller displays the following:
If shore power is disconnected, the inverter automatically switches from Standby
mode to Run Mode. It returns to Standby Mode when shore power is restored.
When shore power is connected, the Volta System samples incoming power for
a few seconds to ensure uniformity requirements are met. If incoming power
meets the requirements, the Volta System turns on and begins charging.
Charging Modes
When shore power is connected, the energy from shore power passes through
the inverter and all loads operate directly from shore power. Simultaneously, if
the Energy Storage Pack requires charge, the inverter charges the pack regard-
less of the inverter On/Off status.
The Energy Storage Pack charges via two charge modes:
Constant Current (CC) Mode
In CC mode, the pack is charged at a higher amperage until it reaches a
programmed state of charge.
The following example shows the pack is charging in CC mode, the pack
voltage is 54.5 volts, and the charge current is at 45 amps.
Constant Voltage (CV) Mode
In CV mode, the pack charges at a lower current in order to maintains a con-
stant voltage. This charge mode occurs when a high current isn’t required
because the pack is already at a higher state of charge.
The following example shows the pack is charging in CV mode, the pack
voltage is 58.0 volts, and the current is at 30 amps.
Charge Current Limit
If the total AC input current from shore power exceeds the branch circuit rating
of the inverter (as set via the Inverter Control Panel), the inverter displays the
following message.
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