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battery backups, 15amps, 20amps lets talk...

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JSt0rm

JSt0rm

Lifer
So its summer again in Santa Monica and this means rolling brownouts and blackouts on occasion. I am trying to run a battery back and trying to figure out some stuff.

Can I use this:

http://www.cyberpowersystems.com/pr...?selectedTabId=specifications&imageI=#tab-box

with this

http://www.amazon.com/NEMA-5-15P-5-2.../dp/B000JCP4GO

And be good?

I have a watt meter thing coming from amazon to figure out exactly what I'm drawing from the wall and I can update in a few days. I don't blow fuses as it is so I dont think I'm over the limits anyhow.
 
UPS are only 85% efficient most of the time. So with 4 12V/9AH batteries the ups in the link has a capacity of about 360 watts total power. That supply will never draw over 10 amps. I love how UPS makers put large watt numbers on that size battery when the battery is not designed to deliver that level of current. The plates on those batteries would buckle from the discharge at currents that it would take to run a UPS at 1200 watts. They would need to source over 25A each initially and they cant exceed but about 5A per battery without damaging the plates.
 
so you arte saying it wold work? I mostly interested in flying through brown outs. Black outs are whatever I autobackup my work every minute.
 
To be sure.

The outlet should be replaced with a 20A outlet, and the circuit that feeds the outlet would have to be at least 12/2, with a 20A breaker back at the box.

If the circuit is 14/2 with a 15A breaker at the box, your adapter idea might result in lots of circuit breaker popping open, or worse, a fire.

There are codes for a reason.
 
ok so my new kill a watt meter shows I'm pulling 900 watts. What do you guys think? Is this thing good enough?
 
Now... it take only 20 min..... to turn the red LED off.... and the battery gauge shows minimum.....I dont think the battery in my iliad was ok in the beginning... What do I do now?
 
ok I ended up going with one of these bad boys

http://www.powerfactorinc.com/ups/powerware/pw9125.htm

the 1500va model. I dont need to worry about the 15amp thing, it handles 1050watts on backup and a draw of 1500watts from the wall. It does double conversion and has a pure sinewave output. Plus I can add rackmounted batteries to it if I need to (I wont but its nerd cool so I said it).
 
JSt0rm01 said:
ok I ended up going with one of these bad boys

http://www.powerfactorinc.com/ups/powerware/pw9125.htm

the 1500va model. I dont need to worry about the 15amp thing, it handles 1050watts on backup and a draw of 1500watts from the wall. It does double conversion and has a pure sinewave output. Plus I can add rackmounted batteries to it if I need to (I wont but its nerd cool so I said it).
Click to expand...


It is a newer model of the one I use on my workstation. Mine is about 8 years old and has been through probably a few thousand dropouts that lasted a few seconds. Those are kind of scary when they occur because everything else not connected cuts off/then back on for a second/then off and there is total silence except for the pc , workstation, etc. I even used it during a hurricane to power the pc and watch tv and dvd while everyone else was in the dark. Mine is a bit bigger it can provide 2300 watts continuous as long as it has battery power. I power it off 4x 400A marine batteries. Run time is about 15 hours at full power.

The nice thing about the double conversion units is they have no switching time , you are always running off the batteries, the AC keeps them charged. You never have to worry about sags or spikes because the power is always exactly the same regardless of the input. Mine is rock stable at exactly 115.01 volts.

I wish more people would use them. Instead they buy the $125 UPS that won't last but a year or two and buy a new one when it fails or the batteries weaken.
 
yeah the double conversion sold me. I want performance through brown-outs and I feel that it must be best for that.

Im putting all this shit on it plus a 12" powered sub and 2 more speakers at rear. I thought I would draw more then 900watts but I guess I dont.

PittsPost004.jpg
 
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