Modfied Sine wave more viable as complete solution?

[joestue]

Most everything with a rectifier is good for straight DC.

Those induction cook tops don't have a big input filter to keep power factor high, 140 volts is about right, They most likely have 400 volt IGBT's in them, so don't go above 200 volts.

Microwaves are closer to 60% efficient, older models ~ 40-50%

[scottsAI]

Smart UPS 1400 and 1500 are 24v. I have.

Check the model's manual before you buy to make sure its what you need.

Later APC added some special models, not sure its sine.

From APC user manual: (must turn beeping off each time, I do it after a cold start)

"6. Alarms - On Battery

In on-battery operation, the on-battery LED comes on and the unit sounds an audible alarm consisting of four beeps every 30 seconds. The alarm stops when the unit returns to on-line operation.

Press the on/test button during on-battery alarms to stop the beeping. This works for the current alarm only — the next on-battery alarm will have the audible indication. Shutting off the audible alarm in this way does not affect alarm reporting through the computer interface or accessory slot."

Have fun,

Scott.

[Bruce S]

Hello ALL;

I should post a new post:-)

BUT I thought this discussion warrants this little "New wording".

In some of the newer smaller UPS(es) there is a new type of wording that sounds better than MSW. They now have the "STEP-APPROXIMATED" sine wave :O.

Basically means Modified, but not square wave.

Even the new APC ES-550s which have non-AC start-up have this in the back of the User Guide, but only in the Specs.

Just thought you'd want to know.

Cheers;

Bruce S

[joe4324]

How do we feel about this step approx thing?  what do you think?  I understand that true sine or pure sine is ideal, but anything in the middle...?

[Bruce S]

Joe4324;

  Took a long thought on this entire post.

Here's may opinion for good or bad.

The original question was modified as a complete solution.

My answer would be no. Reasons being: there are creature comforts or needs that will need pure sine so a MSW will not be a "complete" answer.

The Pure-sines aren't necessary for "everything" either so in truth and mix is best.

The UPS units that have pure-sines will work too, but work better when loaded.

The Stepped units: We just started seeing these so there's no real testing done on my side at this point.

One thing I did tho; I took the 550 unit home attached it to one of my larger 12Vdc MSW inverters 2k/3k and turned it on.

It made the normal start up noise and seemed to run just fine.

My O-scope is no longer operating due to have a stupid moment and loaning it out .

So getting picks of the wave form my have to come from someone else, unless APC has pictures of the waveform on their website.

Hope some of this helps:_)

Bruce S