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Who's here at 6:04:57 PM on 10/20/2017?
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KC
Head Honcho
MY PC

USA
3052 Posts

Posted - 09/05/2007 :  08:50:03 AM  Show Profile  Reply with Quote
Well, the test charger was wofully underpowered.
Just for giggles and grins I took an old 300W PC power supply, tied all the 12V lines together and all the grounds together and hooked it up.

The supply says 15A for 12V but I didn't buy it.
As expected, it fired up the inverter with no load just dandy, but as soon as I turned on the Monitor there was a little *poof*, a wiff of Ozone, and the supply died hehehe.



KC's Kruisers - It's all how you look at things
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motoman_dd
Better Poster
MY PC

Canada
358 Posts

Posted - 09/05/2007 :  12:09:16 PM  Show Profile  Send motoman_dd an AOL message  Click to see motoman_dd's MSN Messenger address  Send motoman_dd a Yahoo! Message  Reply with Quote
shouda gic=vin me that PSU, i only got a 250 here

4ever and ever!
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WheelSmoke
Advanced Member
MY PC

USA
1255 Posts

Posted - 09/07/2007 :  11:04:47 AM  Show Profile  Reply with Quote

Thought you guys might get a jolt from this photo.

Thats part is a network manager for the Novar facility management systems (building controls) they call [url="Logic One."[http://novarcontrols.com[/url]] I think it is referred to as a parallel distributed processing system.

The systems do everything from huge automotive plants to individual buildings with local builders (like me) in stuff like hotel and retail chains.

Impressive stuff. I have heard of them retro-fitting just the building controls in places like hospitals and saving enough energy to give a two year payback guarentee.


--edit--
woops on the link...





Edited by - WheelSmoke on 09/07/2007 11:05:48 AM
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KC
Head Honcho
MY PC

USA
3052 Posts

Posted - 09/10/2007 :  1:44:59 PM  Show Profile  Reply with Quote
Cool.
I figure once I get a get a system that will run and a couple of test meters I'll do some real tests too.
I have access to a nice big gas powered generator, they don't do very much power conditioning as they are meant to power big electric tools like table saws and such, and with several such tools running on the circut I should be able to get a really dirty AC source to test the after-conversion AC signal.

KC's Kruisers - It's all how you look at things
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WheelSmoke
Advanced Member
MY PC

USA
1255 Posts

Posted - 09/11/2007 :  3:24:07 PM  Show Profile  Reply with Quote
A non grounded adaptor or cord should help dirty up the source power too. Cheap hair dryers come to mind. But the same should dirty up your normal home power as well I would imagine.





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WheelSmoke
Advanced Member
MY PC

USA
1255 Posts

Posted - 09/11/2007 :  4:09:55 PM  Show Profile  Reply with Quote
Just a thought but how "dirty" (I call it noise) does ones ac power have to be to even mater?

My home for example has big problems with "spark gap interferience" that has been located by a edison RTVI technician and could be detected blocks away.(http://www.sce.com/CustomerService/SupportRequests/RadioandTVInterferenceInformation.htm) But the repair order is low priority and will take time to be repaired.

What it is is the insulators on three or 4 power poles near my house are leaking energy and causing all kinds of interference from the energy jumping across to ground. On low humidity days it wipes out my tv reception to lower VHF stations. But I did lots of testing to figure that much out and ruled out noisy power in my home now that I think of it so I wonder what or how much noise can even make it past edisons step down transformer for the power to my house.

Come to think of it I wounder how much noise can make it to the output of a typical PSU... hmm




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KC
Head Honcho
MY PC

USA
3052 Posts

Posted - 09/11/2007 :  5:23:10 PM  Show Profile  Reply with Quote
quote:
Originally posted by WheelSmoke

Just a thought but how "dirty" (I call it noise) does ones ac power have to be to even mater?
To your old TV or radio, not very much to see or hear it.

For PC's, most systems these days have pretty good power supplies that clean up the power signal pretty well, especially if you have a good surge/power conditioning strip in front of it, but a suprising amount of items in your house can really screw that up.

For example, plugging an electric pencil sharpener or blow dryer into your PC's power strip is about as stupid as you can get.

"Why is it that whenever I sharpen a pencil my PC resets?"
Thats a true case, and ya, she used a $2 power strip and had an old electric sharpener plugged into it.


KC's Kruisers - It's all how you look at things
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WheelSmoke
Advanced Member
MY PC

USA
1255 Posts

Posted - 09/11/2007 :  9:46:36 PM  Show Profile  Reply with Quote
They create strong magnetic fields as well.

I remember one time I thought my living room TV had a problem because one whole corner of the crt screen had turned a weird color. (green or purple) But next to the TV was a speaker that I had slid forward to reach the wiring and when I moved it back problem went away.




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KC
Head Honcho
MY PC

USA
3052 Posts

Posted - 09/11/2007 :  11:33:47 PM  Show Profile  Reply with Quote
Thats was just a plain old static magnet in the speakers wheel.
You can get the same effect with a good frig magnet, just hold it up to the crt screen and watch the color show.

That reminds me of another story, this was years ago when Floppies were important.
I had a customer with "problems", turned out she was keeping her backup floppies stuck to the side of the metal PC Case with a big magnet.


KC's Kruisers - It's all how you look at things
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WheelSmoke
Advanced Member
MY PC

USA
1255 Posts

Posted - 09/12/2007 :  09:31:19 AM  Show Profile  Reply with Quote
I got side tracked there. woops.

What I wanted to say was those cheap induction type motors used in a pencil sharpner create strong magnetic fields too.






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