| General > General Technical Chat |
| Smart Meters and power factor correction |
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| tom66:
--- Quote from: Zero999 on August 12, 2022, 01:25:41 pm ---No you don't need to know the power factor to calculate kWh. --- End quote --- My point is that you need to measure both V and I continuously, rather than independently, and this is all the information you need to calculate W, VA and PF and numerous other terms. Yes, you do not need to calculate PF to work out W, but you have gathered all of the information required and it's a pretty simple calculation from there on. If you only want to measure VA you can do this by having independent TRMS volt/ammeters on each channel (but I don't think anyone is billed on only reactive power) |
| Miyuki:
It is simple Just look at your bill If it is in kWh/MWh or in kVA/MVA. They are different units for different things. |
| thm_w:
--- Quote from: Miyuki on August 12, 2022, 02:46:58 pm ---It is simple Just look at your bill If it is in kWh/MWh or in kVA/MVA. They are different units for different things. --- End quote --- Its not really that simple, I mean yes for OP we've established they only pay for real power. But for industrial, at least here, you pay real power at the regular rate, then a fee on top of that for average power factor (NOT instantaneous), eg: >90% power factor is 0% fee <50% power factor is 80% fee So you never get charged in VA. |
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