DOI: 10.6084/m9.figshare.24991158.v1
title: Renewable desalination without energy storage: direct-drive photovoltaic electrodialysis via flow-commanded current control

description: Sensor data extracted for the duration of the field pilot on all days including those with maintenance. 
"_time": the time of day in YYYY-MM-DD HH:MM:SS.
"DD/EDR/BATT_POWER_DS": indicates the battery power in watts, where - is power in and + is power out.
"DD/EDR/BATT_SOC_DS": the battery state of charge as a percent up to 100. 
"DD/EDR/BATT_STATE_DS": the battery state indicated by the Victron Cerbo GX.
"DD/EDR/BATT_VOLTAGE_DS": the battery voltage in volts
"DD/EDR/COMPRESSOR_DUTY": the duty cycle on the air compressor
"DD/EDR/COMPRESSOR_TEMP": the compressor temperature
“DD/EDR/CurrentSensor_Battery_DS”: the battery current in A, where – indicates current into the battery and + indicates current out of the battery
“DD/EDR/CurrentSensor_PV_DS”: the PV panel current in A
“DD/EDR/CurrentSensor_Pump_DS”: the pump current sensor in A
“DD/EDR/CurrentSensor_Stack_DS”: the stack current sensor
“DD/EDR/ERINE_DUTY”: the electrode rinse pump duty cycle
“DD/EDR/ERINSE_LEVEL”: the electrode rinse tank level in mm
“DD/EDR/FLOW1_TEMP”: the temperature from the flow meter on channel 1
“DD/EDR/FLOW2_TEMP”: the temperature from the flow meter on channel 2
“DD/EDR/FLOW3_TEMP”: the temperature from the flow meter on the electrode rinse
“DD/EDR/PH_B”: the concentrate stream pH
“DD/EDR/PH_D”: the diluate stream pH
“DD/EDR/PID_Q_OUT_Control_DS”: the PID flow rate commands, out of 100 as a percent of the power applied to the pumps
“DD/EDR/PID_Q_SP_Setpoint_DS”: the PID flow rate setpoint for battery current, nominally 0
“DD/EDR/PRESSURE/AIR”: the air pressure in the compressor in PSI
“DD/EDR/PRESSURE/BRINE_INLET”: the pressure in PSI on the brine inlet water
“DD/EDR/PRESSURE/BRINE_OUTLET”: the pressure in PSI on the brine outlet water
“DD/EDR/PRESSURE/DIL_INLET”: the pressure in PSI on the diluate inlet water
“DD/EDR/PRESSURE/DIL_OUTLET”: the pressure in PSI on the diluate outlet water
“DD/EDR/PRESSURE/ERINSE:” the pressure in PSI on the electrode rinse stream
“DD/EDR/PRESSURE/FILTER_INLET”: the pressure on the prefiltration inlets
“DD/EDR/PRESSURE/FILTER_OUTLET”: the pressure on the prefiltration outlets
“DD/EDR/PRODUCTION_WATER”: the totalized water produced in liters, i.e. a water meter
“DD/EDR/PS_CURRENT_REAL_DS”: the real current measured from the outset of the power supply to the electrodialysis stack in amps
“DD/EDR/PS_Current_CMD_DS”: commanded current to the power supply in amps
“DD/EDR/PS_VOLTAGE_REAL_DS”: the real voltage measured from the outset of the power supply to the electrodialysis stack in volts
“DD/EDR/PV_MPP_operation_DS”: the MPPT operational state indicated by the Victron Cerbo GX.
“DD/EDR/PV_Power_DS”: the PV power coming from the MPPT
“DD/EDR/PV_Voltage_DS”: the PV voltage
“DD/EDR/PumpA_MB_RPM_DS”: Pump A RPM
“DD/EDR/PumpA_MB_SPEED_DS”: Pump A motorbrake speed
“DD/EDR/PumpA_MB_Voltage_DS”: Pump A voltage in volts
“DD/EDR/PumpB_MB_RPM_DS”: Pump B RPM
“DD/EDR/PumpB_MB_SPEED_DS”: Pump B motorbrake speed
“DD/EDR/PumpB_MB_Voltage_DS”: Pump B voltage in volts
“DD/EDR/Stored_Charge_DS”: the charge stored on the capacitive electrodes of the ED stack, in coulombs
“DD/EDR/TEMP”: the ambient temperature of the environment
“DD/EDR/TankA_Level”: the level of tank B in mm 
“DD/EDR/TankB_Level”: the level of tank B in mm 
“DD/EDR/Valve_Timer_DS”: the time it takes in seconds to switch between valve states, a measure of degradation of valve performance
“DD/EDR/VoltageSense_Battery”: the voltage on the battery sensed from voltage divider, unused
“DD/EDR/VoltageSense_Battery_Av”: the averaged voltage on the battery sensed from voltage divider, unused
“DD/EDR/conductivity1_DS”: conductivity of sensor 1 in microS/cm
“DD/EDR/conductivity2_DS”: conductivity of sensor 2 in microS/cm
“DD/EDR/conductivity3_DS”: conductivity of sensor 3 in microS/cm
“DD/EDR/conductivity4_DS”: conductivity of sensor 4 in microS/cm
“DD/EDR/flow1_rate_DS”: flow rate of channel 1
“DD/EDR/flow2_rate_DS”: flow rate of channel 2
“DD/EDR/flow3_rate_DS”: flow rate of channel 3, the electrode rinse
“DD/EDR/temperature_DS”: the ambient temperature in degrees Celsius