Express Operator's Manual

REV090619

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4.0 – Operation

The following sections describe how to operate the PHI ExprESS. The following figure shows the front

panel of the ExprESS.

4.1 – Initial Start Up

To start the ExprESS:

1. Move the circuit breaker on the PHI Battery module(s) to the ON position.

2. Move the Inverter DC Disconnect breaker to the ON position.

3. When first commissioning the system, fully charge the batteries prior to connecting any loads.

The wired remote flashes. After 5 to 10 seconds, the Inverter will be ready for service.

After the ExprESS starts, you can operate it in stand-alone/off-grid mode or in uninterrupted power supply

(UPS) mode:

• Use stand-alone/off-grid mode when you want to power connected devices from the ExprESS’

internal batteries or from solar power.

• Use UPS mode when you want to power attached devices from an AC power grid connected to the

ExprESS.

4.2 – Stand-alone/Off-Grid Mode

Depending on the model, a fully charged PHI ExprESS provides 2000W or 4400W of AC power. A PV

Inlet connector on the left side of the module has a maximum 30 Amp DC rating and is provided for

remote/mobile solar charging. Hard wire the solar PV array to the unit in the case of stationary systems.

In either case, properly size the PV array for the respective unit: Pair a maximum 1.3 kW of solar PV with

the ExprESS 5.8 kWh (2 x PHI 2.9 batteries) unit or a maximum 4.1 kW of solar PV with the ExprESS 7.6

kWh (2 x PHI 3.8 batteries) unit. The paired PV array’s MPPT voltage must exceed the connected battery

bank’s charging voltage. In the case of the ExprESS 5.8 kWh unit, a solar array with a maximum power

voltage (VMP) rating greater than or equal to 36 VDC is recommended. A VMP rating greater than or

equal to 72 VDC is recommended for the ExprESS 7.6 kWh unit.