Energy import example
From PhotoVoltaic Logger new generation
Contents
Abstract
The so called "Energy import" is inspired by PVOutput energy import chart.
If the generated power (Net power) is greater than the consumption, the energy import is no more raising.
Charts
PVOutput
PVLng adoption
The interesting part is the red Energy import spline, which stops at 7:20 by 2820 Wh. This means, no energy import, only export. Import restarts at 17:50.
Please note:
- Arrange the channels according their units to the axes!
Definition
Let's start with the meter channels for the areas.
I decided to put all watt channels on the left and all kilo watt hour channels on the right axis.
All calculation is based on these real channels
- PAC [W] inverter power
- E-Total [Wh] inverter production
- Power usage [W] from S0 impulses
Lets prepare the calculated channels.
Power balance
Definition
This is a full differentiator channel to get also negative values.
Chart settings
For good-bad look the negative values will be shown in red.
Energy Import
Definition
For this channel we need a SensorToMeter channel, which transforms our power usage into an energy usage. (Factor is here set to 1000 to get kilo watt hours from watts.)
The energy import channel is based on the Import / Export channel type.
We define here a negative cost per kilo watt hours to see later the amount consumed. (We pay here 23.44 cent per kilo watt hour == 0.2344 €)
Chart settings
File:EnergyImportChartSettings.png
We define here a positive cost per watt hour to see later the income amount generated.
(We get here 28.74 cent per kilo watt hour == 0.0002874 Euro per watt hour)
S0 consumption and Power consumption
Definition
Here we need also a special helper channel, the Sensor to Meter proxy.
We have to convert the actual power consumption (Power sensor in watt) into an meter channel (in watt hours) which also sums up the data.
Power consumption [Wh] |-> Power usage [W]
The Power usage is a normal power sensor and the Power consumption is the proxy to convert the sensor to a meter channel!
Chart settings
File:PowerConsumptionChartSettings.png File:PowerUsageChartSettings.png
For Power consumption we are also interested in peek powers used.
PAC
Definition
Simply the actual generated inverter power:
Chart settings
We are also interested in the max. value.
Result
Now we can put this all together:
In the Charts view we will have this:
