Inputs-Feeds.md

Inputs & Feeds

This document gives a brief explanation about how the data is collected and processed by the application, and which inputs and feeds it requires. They must exist in emoncms (for each user), otherwise EWatcher may not work properly. Although not every input and feed defined here is currently being used, but it may be in future versions, so it is advised to have all defined. Luckily enough, there has also been created another module to aid with the definition of the inputs and feeds in a fully automatic way (see here).

This application works with two different types of facilities: electric ones and PV self-consumption ones.

Electric facilities

Inputs

Input	Description	Units
iload	Consumption intensity	A
pload	Consumption power	W
voltage	Voltage	V

Note: every input is sent, by convention, to the node 7

Feeds

Feed	Description	Units	Type	Engine	Formula
sILoad	Consumption intensity	A	REALTIME	PHPFIWA	Log iload
sPLoad	Consumption power	W	REALTIME	PHPFIWA	Log pload
sVoltage	Voltage	V	REALTIME	PHPFIWA	Log voltage
eDLoad	Daily consumption	kWh	DAILY	PHPTIMESERIES	From sPLoad using Power to kWh/d
tLoad	Total consumption	kWh	REALTIME	PHPFINA	From sPLoad using Power to kWh

PV self-consumption facilities

Inputs

Input	Description	Units
ipv	Photovoltaic intensity	A
ppv	Photovoltaic power	W
iload	Consumption intensity	A
pload	Consumption power	W
voltage	Voltage	V

Note: every input is sent, by convention, to the node 7

Feeds

Feed	Description	Units	Type	Engine	Formula
sIPv	PV intensity	A	REALTIME	PHPFIWA	Log ipv
sPPv	PV power	W	REALTIME	PHPFIWA	Log ppv
sILoad	Consumption intensity	A	REALTIME	PHPFIWA	Log iload
sPLoad	Consumption power	W	REALTIME	PHPFIWA	Log pload
sVoltage	Voltage	V	REALTIME	PHPFIWA	Log voltage
iPvToLoad	PV power consumption	W	REALTIME	PHPFIWA	ppv if ppv < pload otherwise pload
iGridToLoad	Grid power consumption	W	REALTIME	PHPFIWA	pload - iPvToLoad
iPLoadFromPv	Percentage of consumption with PV power	%	REALTIME	PHPFIWA	100 * iPvToLoad / pload
iPLoadFromGrid	Percentage of consumption with grid power	%	REALTIME	PHPFIWA	100 * iGridToLoad / pload (must match 100 - iPLoadFromPv)
iPvToGrid	PV power exported to the grid	W	REALTIME	PHPFIWA	ppv - iPvToLoad
eDPv	Daily PV energy produced	kWh	DAILY	PHPTIMESERIES	From sPPv using Power to kWh/d
eDGrid	Daily energy imported from the grid	kWh	DAILY	PHPTIMESERIES	From iGridToLoad using Power to kWh/d
eDLoad	Daily consumption	kWh	DAILY	PHPTIMESERIES	From sPLoad using Power to kWh/d
eDPvToGrid	Daily PV energy exported to the grid	kWh	DAILY	PHPTIMESERIES	From iPvToGrid using Power to kWh/d
dPSelf	Percentage of daily self-consumption	%	DAILY	PHPFIWA	100 * (eDPv - eDPvToGrid)/eDPv
dPLoadFromPv	Percentage of daily consumption with PV origin	%	DAILY	PHPFIWA	100 * (eDPv - eDPvToGrid) / eDLoad
eDLoadFromPv	Daily energy consumption from PV energy	kWh	DAILY	PHPTIMESERIES	eDPv - eDPvToGrid
tLoad	Total consumption	kWh	REALTIME	PHPFINA	From sPLoad using Power to kWh
tPv	Total PV energy produced	kWh	REALTIME	PHPFINA	From sPPv using Power to kWh
tLoadFromGrid	Total energy imported from the grid	kWh	REALTIME	PHPFINA	From iGridToLoad using Power to kWh
tPvToLoad	Total PV energy consumed	kWh	REALTIME	PHPFINA	From iPvToLoad using Power to kWh
tPvToGrid	Total PV energy exported to the grid	kWh	REALTIME	PHPFINA	tPv - tPvToLoad

Note: the processes Power to kWh and Power to kWh/d do an automatic log of the result

The following values are calculated with JavaScript in the client, so there is no need to create feeds for them:

Var	Description	Units	Type	Formula
cGrid	Cost of the imported energy	units	REALTIME	cIn * tLoadFromGrid
cPvToGrid	Cost of the energy exported to the grid	units	REALTIME	cOut * tPvToGrid
cLoadNoPv	Consumption cost without PV	units	REALTIME	cIn * tLoad
cLoadPv	Consumption cost with PV	units	REALTIME	cGrid - cPvToGrid
savings	Estimated savings	units	REALTIME	cLoadNoPv - cLoadPv

The default values for the configuration settings (you can change them in some of the EWatcher panels) are:

• cIn = 0.1244
• cOut = 0.054
• units = euros