Solid State Meter - Net Metering
Solid State Meter - Net Metering
(OP)
I understand how an older electromechnical meter can be used in net metering applications by reversing the direction of the meter disk when exporting power back to a utility.
When using a solid-state meter for a net metering application, can someone explain the internals of how the direction of power flow is determined?
When using a solid-state meter for a net metering application, can someone explain the internals of how the direction of power flow is determined?






RE: Solid State Meter - Net Metering
RE: Solid State Meter - Net Metering
RE: Solid State Meter - Net Metering
RE: Solid State Meter - Net Metering
But it is important to note that the meter itself doesn't [b]know[//b] what "direction" positive watts and vars are in. You have to make that determination and apply the meter appropriately.
In most cases there is only one acceptable definition of positive or "delivered" watts and VARs, in others it's an arbitrary determination.
Once that determination is made, you have to apply a specific meter based on that determination. A lot of modern Microprocessor based or solid-state meters will allow you to define that direction in their software (since they're just doing math, this mean's multiplying the calculated current phasor by -1 to add the effect a 180 degree phase shift). If a meter does not give that option, you would have to reverse the current inputs to the meter to get it to change which direction of power it records as negative, and which it records as positive.
Regards,
JBinCA
RE: Solid State Meter - Net Metering
Would this have anything to do with setting up a "dummy" load within the meter that determines the power angle between the voltage inputs?
RE: Solid State Meter - Net Metering
RE: Solid State Meter - Net Metering
RE: Solid State Meter - Net Metering
The digital meter "knows" at least as much as the old electro-mechanical Whm and generally "knows" a lot more.