Hello, my name is Mattias and I work with R&D at an energy Company in Sweden. I work with a lot of questions but try to stick to PV-related questions as much as possible. We have seen a "problem" here in Sweden that different electric grid owners configures their smart electric meters differently. I am preparing a contribution to a PV Conference in Washington and I want to present a connection between my research and how the situation is in North America.
In Sweden, all houses including single family houses are connected to all three phases. If you install a PV system and the internal load or maybe the production of electricity is not even between the phases the Electric meters records different values. For example, if the use (import) of electricity on phase one and two is 1 kW momentarily and the export on phase three is 2 kW. Then one type of electric meter records momentarily 2 kW import and 2 kW export. The other type records 0 kW (1+1-2) on import and exports. The momentarily values are then summed to an hourly value that is collected by the grid owner. I think it is 15 minutes in USA. The collected value is not netted somehow and can be both imported and exported values for that timeframe.
My question is: Is it the same in North America? I cant see a national regulation on this and then I assume that there might be different configurations. For a split-phase Connections, I assume that both legs are measured separatly and the same problem can occur there as well.
Please use your gathered expertize and help me. I have e-mailed NREL but this seems to be new to them (?) and I have not get any answer from them more than that they are looking at the problem and will return with information...
Best regards!
Mattias G, Sweden
In Sweden, all houses including single family houses are connected to all three phases. If you install a PV system and the internal load or maybe the production of electricity is not even between the phases the Electric meters records different values. For example, if the use (import) of electricity on phase one and two is 1 kW momentarily and the export on phase three is 2 kW. Then one type of electric meter records momentarily 2 kW import and 2 kW export. The other type records 0 kW (1+1-2) on import and exports. The momentarily values are then summed to an hourly value that is collected by the grid owner. I think it is 15 minutes in USA. The collected value is not netted somehow and can be both imported and exported values for that timeframe.
My question is: Is it the same in North America? I cant see a national regulation on this and then I assume that there might be different configurations. For a split-phase Connections, I assume that both legs are measured separatly and the same problem can occur there as well.
Please use your gathered expertize and help me. I have e-mailed NREL but this seems to be new to them (?) and I have not get any answer from them more than that they are looking at the problem and will return with information...
Best regards!
Mattias G, Sweden
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