What is a Single Phase Inverter?

Single Phase Inverter is a type of DC to AC Inverter that converts DC input power to single phase AC output power at desired voltage and frequency. It is mainly classified into two types- voltage source inverter (VSI) and current source inverter (CSI). 

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• Voltage source inverter (VSI): VSI converts constant DC input voltage into AC output voltage. In this inverter, the terminal voltage remains constant but the output current changes with the load impedance variation.
• Current source inverter (CSI): CSI converts DC input current into AC output current. This inverter is fed by a DC source (DC voltage source connected in series with an inductor). In this inverter, the output current remains constant but the output voltage changes with the load impedance variation.

Single phase inverters are ideal for use in home appliances, power tools, office equipment, portable equipment, lighting, heating, water pumping in agriculture, adjustable speed AC drives, induction heating, vehicles, UPS and grid-connected applications.

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Christoff84 said:

When you size an inverter to go from single phase to 3 phase you need to upsize it to account for the fact you're drawing more amperage from the single phase than the 3 phase. I doubt a 2.2kW drive will be able to start a 2.2kW motor with any kind of load attached.

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As DickDV said, You don't need to upsize your drive, if it's rated for 2.2kW output then it should deliver that (plus between 10-50% more for up to 30 sec, depending on the drive). What you do need to check is source side wiring and protection, because of course you're going to be drawing around 10A on your single phase, even if your motor is only drawing less than 4A per phase.

Another thing you need to be very careful about is your motor overload protection, especially if you're using this thing to run a number of different motors. the drive will have an internal thermal overload protection (software based), but that algorithm is based on whatever you've told the inverter the motor current was! There's a set up parameter for that.

This may also be what's causing your problem - if that current parameter is set lower than the nameplate rated current of the motor, the inverter may be limiting output voltage / frequency and running in a "current limiting" mode. Again, depends on what you've configured in the inverter. Read the manual and check the inverter display to see what frequency it's running at.

One last thing, If your motor size for the other loads is less than 50% of the drive rating (i.e. less than 1.1kW in your case), you need to ensure you've got appropriate thermal overloads fitted to protect the motors.

As DickDV said, You don't need to upsize your drive, if it's rated for 2.2kW output then it should deliver that (plus between 10-50% more for up to 30 sec, depending on the drive). What you do need to check is source side wiring and protection, because of course you're going to be drawing around 10A on your single phase, even if your motor is only drawing less than 4AAnother thing you need to be very careful about is your motor overload protection, especially if you're using this thing to run a number of different motors. the drive will have an internal thermal overload protection (software based), but that algorithm is based on whatever you've told the inverter the motor current was! There's a set up parameter for that.This may also be what's causing your problem - if that current parameter is set lower than the nameplate rated current of the motor, the inverter may be limiting output voltage / frequency and running in a "current limiting" mode. Again, depends on what you've configured in the inverter. Read the manual and check the inverter display to see what frequency it's running at.One last thing, If your motor size for the other loads is less than 50% of the drive rating (i.e. less than 1.1kW in your case), you need to ensure you've got appropriate thermal overloads fitted to protect the motors.

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