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Greenbyte Documentation

Lost Production to Downtime (Inverter Normalized)

This signal is used as a part of the Production-Based Availability (Inverter Normalized) calculation method. This method dictates that if all the inverters mapped to the same Primary meter are offline, then the lost production can only be allocated to downtime, as indicated by the Energy meter-based availability of the Primary meter. If the site is down, then the inverter-normalized calculations will return a “0” and conventional Greenbyte methods for calculating Potential Power are utilized here.

If the Energy Meter-based Availability = 0 (that is, not registering any energy output), run:

Lost_Production_to_Downtime__Inverter_Normalized__-_Description.png

Note

Negative values are not permitted.

Technology

Solar

Remarks

This signal is the same as Energy Theoretical (Inverter) for the period, where, the Primary meter is unavailable, as the produced power then is 0.

In order for this signal to have a value, it must follow the Rules for Referencing Devices that concern Primary meter mapping.

Negative values are not allowed.

Equation
Lost_Production_to_Downtime__Inverter_Normalized__-_Equation.png

Where:

ELPD,normalized+

is the Lost Production to Downtime (inverter normalized), clamped to the positive part

Aenergymeter

is the Energy meter-based Availability for the primary meter

PCP

is the Cascading Potential Power - Solar

Peffectivez

is the Effective Power, with a fallback to 0 if undefined

T

is the device resolution in hours

Inputs
Lost_Production_to_Downtime__Inverter_Normalized__-_Inputs.png
Usage Example

Here the Lost Production to Downtime (inverter-normalized) is plotted in red in the lower graph and the Energy meter-based availability is plotted in blue at the top. When the Energy meter is online (100% in the upper graph), no Lost Production to Downtime is logged. As soon as the Energy meter becomes offline, Lost Production to Downtime is displayed:

Lost_Production_to_Downtime__Inverter_Normalized__-_Usage_Example_1.png

When we expect some power according to the Cascading Potential Power, the Energy meter is not available.

Lost_Production_to_Downtime__Inverter_Normalized__-_Usage_Example_2.png

We will end up with Lost Production to Downtime (blue). The lost production in the available timespan ends up as Lost Production to Performance:

Lost_Production_to_Downtime__Inverter_Normalized__-_Usage_Example_3.png