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Solar Off-grid PV system Testing Kit - Coggle Diagram
Solar Off-grid PV system
Testing Kit
Experiments to be performed
Voltage & Current measurement (PV & INV)
Voltage
Power
current
Power & Energy measurement (PV & INV)
Power analyzer
Procedure
Connect the power analyzer to the output of the solar PV system.
Connect the current clamp to the output of the solar PV system.
Connect the voltage meter to the output of the solar PV system.
(Optional) Connect the data logger to the power analyzer.
Turn on the solar PV system and record the power and voltage readings .
(Optional) Start the data logger to record the power and voltage readings over time.
Efficiency (%) = (Output power / Input power) * 100
Energy (Wh) = Power (W) * Time (h)
A current clamp
A voltage meter
Depth of Discharge testing
give you an idea of how much energy you can expect to get out of your battery before it needs to be recharged.
Procedure
DoD = (Energy withdrawn from battery) / (Total capacity of battery) * 100%
Reconnect the battery to the solar panels and any other loads.
Record the time it takes to discharge the battery to the predetermined DoD.
Discharge the battery until it reaches a predetermined DoD.
Connect the battery to a load tester.
Disconnect the battery from the solar panels and any other loads.
Fully charge the battery.
Inverter Efficiency Testing
Visual inspection
This involves checking the inverter for any physical damage, such as cracks, dents, or loose connections.
Performance testing
inverter's efficiency, output voltage and current, and maximum power point tracking (MPPT) performance.
Protection testing
overvoltage and overcurrent protection.
Requirement
A power meter
A DC voltage and current meter
A load bank
Procedure
Disconnect the inverter from the solar panel array and battery bank.
Connect the power meter to the inverter's output terminals.
Connect the DC voltage and current meter to the inverter's input terminals.
Connect the load bank to the inverter's output terminals.
Turn on the inverter.
Adjust the load bank until the inverter is operating at its rated output power.
Record the inverter's input voltage and current, output voltage and current, and power output.
Repeat steps 6 and 7 for a range of load levels.
Calculate the inverter's efficiency at each load level.
Efficiency = (Output power / Input power) * 100%
Solar panel simulator
inverter's MPPT performance
Inverter Thermal response testing
A data logger to record the inverter's internal temperature
A temperature probe to measure the ambient temperature
A power meter to measure the inverter's input and output power
A load bank to simulate the inverter's load
Battery charging and discharging efficiency
Charging efficiency is the percentage of energy from the charger that is actually stored in the battery
Discharging efficiency is the percentage of energy stored in the battery that is actually available to power loads.
we will require
A battery charger
A battery capacity tester
A current meter
A voltage meter
A stopwatch
Procedure
Fully charge the battery using the battery charger.
Connect the battery to the battery capacity tester and record the battery capacity.
Connect the battery to the current meter and voltage meter.
Connect a load to the battery and start the stopwatch.
Record the
current and voltage
readings every few minutes.
Continue to record the current and voltage readings until the battery is discharged.
Once the battery is discharged, stop the stopwatch and record the
total time.
Discharging efficiency = (Battery energy output) / (Battery capacity before discharging) * 100%
Battery energy output = (Average current)
(Average voltage)
(Total discharge time)
Charger energy input = (Charger current)
(Charger voltage)
(Charging time)
