Fox ESS Cloud
The Fox ESS Cloud web site provides access to the history of data uploaded by the data logger. You login to the site using the same credentials as the Fox ESS app. To access historical info:
- Click Devices
- Click Inverter
- Click More Options (on the right hand side of the page)
The web site displays the Inverter Details page:
This includes:
- Device Status
- Battery Status
- Energy Flow
- Power History / Statistics
- Search Window
The device status shows Today Yield and Total Yield (the same figures appear in Fox App v1). These show the energy output by the inverter from solar generation and the batteries combined. This is not the energy generated by your solar panels. To see this, use the Fox App v2, as described here and look at the Production report. Earnings shown on these pages are calculated using the Feed-in Tariff. The value that is used can be changed via the Site Settings if required.
The search window allows you to select inverter parameter values and view the history:
The site caters for both single phase and three phase inverters and some values are presented as 3 phases:
- R (or L1) is the Reference phase in a 3 phase system or the Live connection in a single phase system
- S (or L2) is the Secondary phase in a 3 phase system
- T (or L3) is the Tertiary phase in a 3 phase system
In general, for single phase systems, R values are used. For example, RVolt is the grid voltage.
While the majority of inverters have 2 PV inputs, some have up to 4 string input voltages / MPPTs. Each MPPT measures 3 values at the input to the inverter:
- PVn Volt: the DC voltage being presented by each of the PV strings 1,2,3 and 4, in volts (V)
- PVn Current: the DC current flowing through each of the PV strings 1,2,3 and 4, in Amps (A)
- PVn Power: the power from each of the PV strings 1,2,3 and 4, in kilowatts (kW)
PV Power is the total solar power generated, the sum of PV1, PV2, PV3 and PV4 power (kW)
- RVolt, SVolt, TVolt: the AC voltage on the grid output from the inverter, in volts (V). Only RVolt is active for single phase inverters
- RCurrent, SCurrent, TCurrent: the AC current flowing in the grid output from the inverter, in amps (A). Only RCurrent is active for single phase inverters
- RFreq, SFreq, TFreq: the frequency of the grid output, in hertz (Hz). Only RFreq is active for single phase inverters
- RPower, SPower, TPower: the AC power flowing into the grid output from the inverter, in kilowatts (kW). Only RPower is active for single phase inverters
- EPS-RVolt, EPS-SVolt, EPS-TVolt: the AC voltage on EPS output from the inverter, in volts (V). Only EPS-RVolt is active for single phase inverters
- EPS-RCurrent, EPS-SCurrent, EPS-TCurrent: the AC current flowing in the EPS output from the inverter, in volts (V). Only EPS-RCurrent is active for single phase inverters
- EPS Power, EPS-RPower, EPS-SPower, EPS-TPower: the AC power flowing into the EPS output from the inverter, in kilowatts (kW). Only EPS-RPower is active for single phase inverters
- Output Power: the true power being output by the inverter, in kilowatts (kW). Output Power is (PV Power + Discharge Power - Charge Power - System Losses)
- Reactive Power: the reactive power being output by the inverter, in kilovolt-amps reactive (kVAR)
- Power Factor: the ratio of the true power output in kilowatts (kW) to the apparent power output, in kilovolt-amps (kVA)
- Load Power, Loads RPower, Loads SPower, Loads TPower: the AC power flowing into the house load, in kilowatts (kW). Only LoadPower is active for single phase inverters. Load Power is (Output Power + Meter 2 Power - Feed In Power + Grid Consumption Power)
- Meter Power, Meter RPower, Meter SPower, Meter TPower: the power being read by the grid meter or current clamp CT1, in kilowatts (kW).
- Feed In Power: the power being exported back to the grid, tracks CT1 / Meter 1 when it is negative, in kilowatts (kW)
- Grid Consumption Power: the power being consumed from the grid, tracks CT1 / Meter 1 when it is positive, in kilowatts (kW)
- Meter2 Power: the power being read by meter 2 or current clamp CT2, in kilowatts (kW).
- Input Power: this value is not split out by Fox in the cloud data. It is the power consumed by the inverter when charging the batteries from the inverter grid connection, typically when force charging from grid. You see this as a negative value for Output Power
- SoC: State of Charge for the battery. The percentage of the battery capacity that is available
- Inv Bat Volt: the DC battery voltage, measured by the inverter, in volts (V)
- Bat Volt: the DC battery voltage, measured by the BMS, in volts (V)
- Inv Bat Current: the DC current flowing from the battery, measured by inverter, in amps (A)
- Bat Current: the DC current flowing from the battery, measured by the BMS, in amps (A)
- Inv Bat Power: the power being drawn from the battery by the inverter, in kilowatts (kW). Negative when the battery is being charged
- Charge Power: power used to charge the battery, in kilowatts (kW). This tracks Inv Bat Power when it is negative.
- Discharge Power: power taken from the batter,y in kilowatts (kW). This tracks Inv Bat Power when it is positive.
- Ambient Temperature: the temperature inside the inverter, also known as Inner Temperature, in degrees C
- Inv Temperature: the temperature of the vanes on the back of the inverter, in degrees C
- Bat Temperature: the temperature of the BMS, also known as BMS temperature, in degrees C
- Boost Temperature, DSP Temperature, Charge Temperature: usually zero, not used for single phase inverters but may be available on some higher power 3 phase inverters
If you are familiar with programming tools, such as Python and Jupyter Lab, you can directly access and manipulate data in the Fox Cloud using the sample code provided here