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The chart displaying consumption shows negative values. You can view this in the XOLTA app under the tab DATA > SELF-CONSUMPTION. The dark blue curve represents the consumption.
Causes and solutions
A possible root cause might originate in the setup of the PV meter. One or more of the following issues could result in negative consumption:
- Cause: Not all electricity produced is being measured, for example, if there are no meters installed on some of your solar panels.
Solution: Ensure that meters are installed on all energy-producing sources. - Cause: One or more of the current transformers are pointing in opposite directions.
Solution: Ensure that the arrows on all current transformers point in the same direction. -
Cause: The three voltage phases on the meter do not match the numbering of the current transformers.
Solution: Ensure the phases (L1, L2, L3) are correctly matched on the smart meter. Incorrect phase matching will result in inaccurate measurements. Verify that the current transformer for each phase is installed on the same phase as its corresponding voltage measurement wire. For example, the current transformer for phase L1 should align with the voltage wire for phase L1.- Use a multimeter to measure the AC voltage between the meter’s input terminals and the grid connection for each phase (L1, L2, and L3). The voltage should read 0 V.
- If the multimeter shows anything other than 0 V, switch the voltage phases until the multimeter reads 0 V.
- Cause: The PV meter is measuring both electricity production and some consumption. For instance, this might happen if the current transformer is placed in a way that also measures the consumption of your refrigerator. This leads to misleading consumption measurements.
Solution: Position the current transformer so it measures only the electricity production from the solar inverters or other energy-producing sources.
The example below shows a correctly placed current transformer that measures only the production from the solar panels and not the consumption from any electrical appliances inside the shed.