Symptoms:
The EI Inverter log reports the following message: Warning Code 210 - PV Polarity Reversed.
Cause:
PV source circuits have been reversed, i.e. the positive homerun was landed in the negative terminal inside the inverter.
Resolution:
Perform the following steps:
Step 1. Turn off the system.
| 1. Turn off EI Battery. | |
|
2. Turn off EI Inverter power switch and external DC disconnect (if applicable). |
|
| 3. Turn off EI Inverter AC disconnect. |
Step 2. Visually check the connection/polarity of all PV/DC string input wirings to the inverter.
|
Check for proper wire colors:
|
|
|
Check for proper wire labeling:
|
|
|
Check for proper tape wraps. Since installers use black wire, red tape is usually used to indicate the positive homerun. |
Is the PV wiring labeled correctly and match the proper EI Inverter terminal they are connected to?
YES - Continue to Step 3.
NO - Fix PV/DC string input wirings. Continue to Step 4.
Step 3. Use a multimeter to check all PV/DC string input polarity.
Sometimes the homeruns can be labeled or colored correctly but the other end is terminated in the wrong terminal in the junction, transition, or combiner box. For example, in the figure below, the strings are reversed at the combiner box.
Polarity checks using a multimeter are next. Put the black lead on the negative wire and the red lead on the positive wire of the same PV string.
| Positive reading = polarity check passed | |
| Negative reading = polarity check failed |
Is the voltage correct?
Yes - Continue to Step 4.
NO - Fix PV/DC string input wiring. Continue to Step 4.
Step 4. Turn on the system in the following order:
- Turn on battery.
- Turn on inverter AC disconnect.
- Turn on inverter power switch and DC disconnect (if applicable).
Step 5. If the fault still exists, Contact Tigo Support for assistance.