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Inverters

homesman

Feb 11, 2018
1
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Feb 11, 2018
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I have bought a 1/2hp 90vac 1ph motor on ebay. My need is to convert 12vdc to the 90vac, but am having trouble fining a inverter that will invert to 90. Will a inverter that does invert to 110vac work with this 90vac, or do I need to send this motor back?
 
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Hopup

Jul 5, 2015
253
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Jul 5, 2015
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253
You can reduce the voltage using variac. They are widely available on Ebay and other sites.
 

duke37

Jan 9, 2011
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Jan 9, 2011
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5,364
A 20V transformer can be used to subtract 20V from the invertor output.
The motor may not like a non sine supply. What does your invertor supply?
 

flippineck

Sep 8, 2013
358
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Sep 8, 2013
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358
Watch out as well for the cheaper inverters that claim a certain power rating but fail to deliver it for a number of reasons.

I bought one from a Chinese Ebay supplier that claimed '3000W / 6000W peak' but in practise it only seems to be able to reliably cope with much less. Connecting a 2400W kettle causes it to go into instant overload protection. I only use it to run the LED lighting in my caravan now. I resorted to a diesel generator for the kettle etc.

I understand many types of load classed as 'inductive' (some motors, fluorescent tube ballasts etc) take a much higher current than normal for a few seconds on start-up, such that you might need an inverter with a rating much, much higher than the appliance's normal constant running rating in order to get it started reliably.

I might be wrong but I think there's a technology called 'soft start' on some inverters that tries to cope with inductive loads by slowly ramping up the output on load connection, so there isn't so bad of a sudden current rush
 

JWHassler

Dec 22, 2014
86
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Dec 22, 2014
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86
Where did you get a 90 volt AC motor?
Ninety volts DC is very common
 
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