Electronics > Projects, Designs, and Technical Stuff
Motor inverter as a battery to mains power inverter
haxby:
Hi all,
Short story:
I have a high current 200V DC source that I want to convert to 240V AC at 5KW.
I also have a motor inverter Variable Frequency Drive (VFD) rated at 11KW that can accommodate a DC input voltage.
I need to know if I can connect the VFD to the 200V DC source, then run the output to a common transformer (instead of a motor for which it was designed) and use the transformer output as my power.
Would this work???
More detailed story:
I have a Toyota Prius that I would like to use as a portable power generator. The prius traction battery is around 200 to 230V DC, and I know that it is good for at least 5KW output. The output has to pass through a transformer as any earth leakage on either positive or negative battery terminal will shut off the Prius and generate an error code. I propose to use the VFD on the DC side of the battery, with the output to drive a transformer. Most probably this transformer will be one of those 110V to 220V iron core transformers used when using US appliances in Australia or vice versa...... will connecting the VFD to the transformer work?
NiHaoMike:
More economical than trying to get such a large transformer is to get multiple 48V "telecom rectifiers" and connect the outputs in series. They're really cheap on the surplus market as in $20 or so for a 2kW unit.
The VFD will work fine if you add an output filter and can run it in V/Hz mode with phase imbalance detection disabled. In fact, if the load is a (single phase) motor, you can do some limited V/Hz control.
haxby:
Thanks for that. Sounds promising. What will the output filter do?
NiHaoMike:
The VFD outputs high frequency PWM, so you need the filter to prevent it from causing a lot of EMI.
haxby:
Thanks for that. Any leads for the 48V telecom rectifier transformers? I tried ebay with no luck... $20 sounds amazing for the copper alone!
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