How can I make backup power supply w/ a car battery & a plug strip?

[d33pt]

Zosom...I think you are thinking too hard.

 

[etech]

Zolson, can you explain the phase of 120VAC and what will happen if the voltage from the wall and the voltage from the inverter are not in phase?

Also, what is half-wave rectification and what is the result of a diode across 120VAC.



Soybomb, battery charges can control the current and voltage so that only a trickle charge goes to the battery when there is no load on it.

 

[Soybomb]

etech, I know but is there a battery charger in there anywhere? It looks like he is just wanted to put a ac/dc convertor on there and connect it to the battery....like hooking water pipes together

 

[Ornery]

I'm taking the side that says that this ain't rocket science, and that it can be done safely, cheaply and effectively.

• Use a cheap UPS for "benefits like line conditioning, surge protection, intelligent shutdown, power boosting, warranty, insurance, etc.
• Use a marine battery in parallel to the UPS battery for longer up time
• Mount it in the garage for safety.
• Use a regulated charger for the marine battery
• Perhaps you'll need isolators or something, but probably not

Big deal. Anybody that's capable of overclocking a PC ought to be able to handle it. If I were in the market for a UPS, I'd have done it already!

 

[Windogg]

Well, I ain't go no fancy EE school engineers paper but I be working on PCs and stuff fer many many many many many years. Over the last year I be workin with dem folks dat put all them fancy gizmo into UPSes. I showed them tha diagram and theys put down that there moonshine and laffed their asses off. Seems many of them folk think your funnin since they've been working on UPSes and other 'letical stuff before you'se crapping in yer diapers. In fact some of dem be working on the stuff when yo mama was still in the highschool bathroom sneakin smokes. I dunno who to believe. You a student or guys that have made almost ev'ry APC reference design for the last decade. No 'ffense but I think my mind be made up.

Hickdogg

 

[ZapZilla]

LOL!

 

[Zoson]

basically, you don't need to regulate the power going into the battery because it's deep cycle, and it will discharge at the rate it's charging at due to the dc/ac converters. the diode will ensure no feedback electricity if the power goes out, think about it, the battery is in a closed loop, if it doesn't have charge going through the loop, it'll give off energy and cause a short circuit if you don't have a diode to make sure the current only goes one way.
Also, the 120V AC will be in phase because the circuit is parallel, and also the converter is between the first branch and the battery, so one side of the parallel circuit is dc, and the other is ac, and then converted again before the circuit is put back together. The harmonics will be fine because the current will not be broken at all, especially if the battery is fully charged the sine wave will not be affected. Keep it simple, putting too much BS in it will only make it harder.
-Zoson
EDIT: oh yeah, and would you guys freakin' spell my name right? (it's a pet peeve of mine.)

 

[Windogg]

Let me see. We got some boy comin in with a head fulla steam snappin at me on day one. Then he be trying to steal Neo's thunder. Neffed it up and got banned on day one. Then he be comin in here correctin us with his fancy school grammer. Ia do believe we gotta neffer heres folks.

Hickdogg

 

[etech]

Zolson, what makes you think that just because the inverter and the outlet are in parallel that the voltages will be in phase?

You are welcome to try it but please know where the breakers and a fire extinguisher are.

What the heck does the battery being "deep cycle" have to do with anything, that is a description of whether the battery can be deep discharged or not.


One of the most important things to learn in college is that you still have a lot to learn.

 

[apoppin]

580 bucks for a UPS???!!

WTF, for that money buy yourself a good (used) small generator. That way you can keep your lights on and the television too.

 

[Gunbuster]

With the rolling blackout thing do you think laptop sales in that area will surge?

 

[Thegonagle]

LMAO< Windogg.

Just s?pose the volts was in phase, an? nottin? bad?ll happ?n with the power on. Now s?pose the power goes out. The inverter?ll feed power back on the grid and try to power the whole neighborhood. Spells a ov?rload for the inverter real real fast.

BTW, I?ve known and understood some things about electricity since I was 4, have tinkered around since I was 6, and held a position as an electronics technician from November 96 until June 99.

This is all in good fun, Zoson, and good luck in school, but pay attention.