Troubleshooting Item: No Power

Unresponsive Unit Diagnosis

Resolving issues when the unit shows no display, no LED indicators, or fails to power on completely.

An unresponsive SunHopper^®-D unit usually indicates a total lack of power from all primary sources or a triggered safety disconnect/protective fuse.

The system is designed to power up directly from the PV solar array once minimum startup voltage is available, or from the AC grid line (if wired).

1 Check if the solar PV disconnect switch is in the "ON" position.

2 Verify that there is sufficient daylight and that open-circuit PV voltage is above 75V DC.

3 If using AC grid backup, verify that the AC breaker is on and 120/240V AC is present at terminals.

4 Check for any loose wire connections at the DC and AC terminal blocks.

5 Ensure PV polarities (+ and -) are correct.

1 Perform a full power cycle: Switch off both DC and AC supply lines, wait 2 minutes, then turn on DC followed by AC.

2 If the unit was shut down and powered up quickly it will enter a sleep state for 8 minutes. Press the center button to bypass this sleep state.

3 Check external fuses and breakers for continuity.

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