UPS output...... square or sine ??
Submitted: Sunday, Nov 14, 2010 at 12:52
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Member - Joe n Mel n kids (FNQ
Does anyone know if the output of a UPS is square wave or sine wave, the ones we have it is not marked ..............
Why cannot one of these be used as an inverter, there are some big units around, 12v volt, built in charger system ...... yes not simple but with a good sparky to make certain it is safely done, why not ?????
Reply By: Bushranger1 - Sunday, Nov 14, 2010 at 15:11
Sunday, Nov 14, 2010 at 15:11
Hi Joe,
I am by no means an expert but I had to spec a UPS for some sensitive laser measuring gear that I use in my job & I used this calculator before I purchased one to see the run time I would get before the unit shut down in a power failure situation.
Eaton Powerware
As you can see they are not designed to run your equipment for any decent period of time like a dual battery system & inverter unless you buy a real large one. (Heavy, expensive & overkill).
I asked our electronics guy about the 2 different types of UPS & this was my understanding in laymens terms.
1. The cheaper ones filter the power to a degree & switch to battery in the event of power failure.
2. The more expensive ones drop the power to a lower voltage then use an inbuilt inverter to bring the volts back up to 240v. This results in a very good waveform suitable for the most sensitive equipment.
Either way they just are not designed as a backup power supply for any length of time.
Cheers
Stuart
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Follow Up By: Member - Joe n Mel n kids (FNQ - Sunday, Nov 14, 2010 at 15:44
Sunday, Nov 14, 2010 at 15:44
thanks for that, the web site is good and answers my question, all i checked were pure sine wave, we live remote and rely on good UPS's and have had a few in the past and always looked at the "inverters" on the market, they are exactly the same principle as a UPS but expensive for what you get .........
We set up some that have the ability to add a bank of batteries to get longer standby times, they use an anderson plugs to connect more banks ....
The length of time of "backup" is dependent on the size of the battery and the average UPS only has a small one so you can save and switch off what is running ...
As you say the good ones drop it then bring it back up with the inverter, that to me says it is designed to run continually as an inverter, and with a pure sine wave ...... interesting
Hmmmm now to do more reserch ..
Thanks for that Stuart
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