Maker Pro
Maker Pro

Inverters

homesman

Feb 11, 2018
1
Joined
Feb 11, 2018
Messages
1
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?
 
Last edited by a moderator:

Hopup

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

duke37

Jan 9, 2011
5,364
Joined
Jan 9, 2011
Messages
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
350
Joined
Sep 8, 2013
Messages
350
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
Joined
Dec 22, 2014
Messages
86
Where did you get a 90 volt AC motor?
Ninety volts DC is very common
 
Top