User Manual
5.4.1.2.1 Detection of leakage to ground
Solis inverters are transformer-less and do not have an array connection to ground.
Any measurement of a fixed voltage between ground and either the positive or negative string
wiring indicates a leakage (ground fault) to ground and must be corrected prior to energizing
the inverter or damage to the inverter may result.
To measure leakage to ground, perform the following steps:
1. Ensure that neither negative nor positive DC conductors are connected to the ground strip.
2. Measure each string positive connection to ground.
3. Measure each string negative connection to ground.
4. Verify the voltage is “floating”(slowly discharging toward 0V), not a consistent voltage
to ground. Make sure you notice the units of the measurement. mV is not the same as V.
Measure VAC and verify voltage is within local grid standards.
1. Measure each phase to ground (L-G).
2. Measure phases to the other phases in pairs (L-L). PH A to PH B, PH B to PH C and
PH C to PH A.
3. If the meter is equipped, measure the frequency of each phase to ground.
4. Ensure each measurement is within local grid standards and the inverter specifications
as noted in Section 9 “Specifications”.
5.4.2.1 Measure VAC and frequency
A phase rotation test is recommended to ensure the phases have been connected in the
appropriate order. Solis inverters do not require a specific phase rotation connection.
However, the local utility may require a specific phase rotation or a record of the phase
configuration of the installation.
5.4.2.2 Phase rotation test
Verify AC configuration.
5.4.2 AC configuration
Verify DC connections.
Lightly tug on each DC cable to ensure it is properly connected to the inverter.
5.4.3 DC Connections
Verify AC connections.
1. Lightly tug on each AC cable to ensure it is fully captured in the terminal.
2. Visually check for any stray strands that may not be inserted in the terminal.
3. Check to ensure the terminal screws are torque to correct specification table 3.1 .
5.4.4 AC Connections
5. Commissioning
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