Express Operator's Manual

REV090619

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3.4 – Breakers and Protection Circuitry

The number of circuit breakers on the PHI ExprESS varies by model:

• ExprESS 5.8 has nine integrated circuit breakers

• ExprESS 7.6 has eight integrated circuit breakers.

A Battery Disconnect 80-Amp breaker protects against battery overcurrent and provides a simple

disconnect if the ExprESS requires servicing or needs to be stored for an extended period of time. The

breaker is located on the front panel of the ExprESS 5.8 module and on the top of the ExprESS 7.6

module.

The remaining three breakers are housed inside the panel below the Inverter/charger. These breakers act

as protection for AC output, PV or solar-power input, and AC input for battery charging or AC pass-through

in UPS mode. They protect against excessive load current and offer protection from short circuits.

All circuit breakers serve as a disconnect for troubleshooting and maintenance. They can also be used to

disconnect the battery from the Inverter during extended periods of storage.

3.5 – Installing the ExprESS 5.8

1. Confirm that all circuit breakers on the ExprESS 5.8 (including batteries) are in the OFF position.

2. Starting with the bottom module, slide the module into position. Make sure it is centered between the

retaining brackets, with the circuit breaker facing forward.

3. Slide the next module into the bracket above the first module.

4. Using the supplied slotted hex screws, align the crossbars, and then hand-tighten the screws at the

bottom crossbar and the top crossbar.

5. Make certain that the screws turn freely, and then tighten all four screws securing top module into

place. The bottom module is held into place by the top module bracket.

6. Starting with the positive (red) cables, push the red booties onto the wire with the connecting lugs

exiting the large opening. Then repeat this step with the negative (black) cables.

7. Remove the stainless steel 11/16 in. nut and lock washer from the positive terminals.

Do not try to remove the brass jam nut at the base of the terminal.

8. Align the positive cable onto the positive terminal.

9. With the connector lug resting on the brass jam nut, install the lock washer followed by the 11/16in

nut, and then hand tighten.

10. Using the torque wrench, tighten 11/16in nut to 160 in-lbs/13.3 ft-lbs/18.07 nm. Repeat this step with

the next positive cable and two negative cables.

11. Secure the red and black boots over terminals, and then make sure the boots are seated properly on

the terminal base.

This completes the installation procedure for the ExprESS 5.8.