Version 1.0, October 2024
Replace Top of Home Hub Inverter — North America
3
Test for safe voltages
Before you disconnect any wires in the DC Disconnect (DCD) unit, you must test for safe
voltages.
Test at the DC terminals or in the upper cabinet to confirm that the switch is functioning
properly and that the strings have the correct voltage.
Test the string DC voltage at the terminals of the rotary switch in the DCD unit. The
measured DC voltage should be ~1V
DC
per number of optimizers on that string. For
example, if there are 20 Power Optimizers in a string, your measurement must be 20V ±
0.1V.
If the voltage measured is greater or less than 1 volt per Power Optimizer, disconnect all the
strings and take measurements in open air (open circuit) to find the string with the incorrect
voltage.
Inspect the string with the incorrect voltage to find the source of the voltage loss or gain.
Uninstall the top of the inverter
Step 1: Disconnect the wires from the communication board.
1. Take a picture of the AC and DC cable connections to the power board before you
disconnect the wires.
2. Disconnect the communications cables from the front of the communication board.
3. Disconnect the antenna cable from the communications modem (if relevant).
4. Remove communication devices from the original inverter and place them in a safe location.
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