car battery UPS

how to upgrade that busted interruptible power supply and replace the old battery with a car battery!

CORRECTION ON THIS MOD. YOU NEED A UPS WITH A REALLY POWERFUL INVERTER TO POWER MORE THAN 1 COMPUTER. something around the range of 600VA+ (VA is the most typical rating found on most UPS boxes, but if you didn't know that you'd prob wouldn't try this anyway haha)

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People & Blogs

Tags:

• UPS
• car
• battery
• hotwire

[dinnerandashow]

All lead acid batteries should be replaced after it has been fully discharged just a few times. Its the nature of lead acid batteries. Deep cycle lead batteries are a little better but they also significantly degrade after being fully discharged.

A smart ups device would disconnect the battery before the battery fully discharges.

But not to worry, I forget his name, but a Chinese Professor at Stanford came up with a super lithium battery that is 10x the capacity of today's lithium battery.

[catch10110]

from what i hear that's only been achieved in the lab on the nanoscale in small quantities, hardly practical to even mention.

my friend at the University of Texas in the ChE department has attempted to reproduce such results but getting nowhere near even with the original procedures. they believe it's fraud for grant money.

[LANkillaNZ]

possibly catch fire. As suggested below, get a breaker betweem the battery and UPS. Good idea, but poorly implemented and tested

[jeclone]

You say the 3 amp hour battery can't handle 30 amps but then you use alligator clips and wire that can't handle that much.

also you use a marine battery you should use a full fledge Deep cycle battery.

Your "600 watt" stereo is nowhere near that powerful really, even so at half volume it would also be 1/4 power not 1/2.

something else to keep track of is that a small ups might not be able to run its rated power for longer then the original battery is capable of.

other then that, good Hack

[MultiCool911]

this will work but i just want to know,when the big battery is running the ups for a longer time,wont it overheat and get damaged? and also,when power is back on is it capable of charging the battery efficiently?

[Security98]

sweet explained it better then any other video ive seen since im a total noob with electricity. But i hear puting it in a battery box makes it safer also using a fuse how can i add a fuse to this. Also I hear you need to use same amp hours is this correct?

[CSNWOR]

This is a very bad idea. One you void the UL on the product and if it catches fire - your're going to be at fault. The second reason you should not do this is the charger in the UPS is not large enough to charge the battery. The third reason is the OEM battery is a VLRA battery is considered a non gassing battery, whereas the car battery does exhaust fumes. Never modify a product with non standard products.

[jeclone]

@bobbytimberlake i agree the radio is only a small (and inconsistent) power draw on the UPS. A much better test would be a light bulb they draw pretty close to what there rated for and are nice and quiet.

[bobbytimberlake]

@jeclone A 10 dB increase requires 10x the power, so if you're using "half loudness" instead of "half volume setting", you're still at 1/10th peak power.

Unless 140 of those watts are being used for the display, CD motor, etc, I don't see it using anywhere near 150 watts for casual listening. His demonstration isn't putting much load on the UPS at all.

[jeclone]

@bobbytimberlake how he is referencing Half is not said, is it half the numerical number on the volume display or "Sounds" half as loud? for something to sound twice/half as loud it need 10dB more/less. while i agree that at normal volume and what is shown in this video is probably only a few watts to the speakers, he is using a "Home theater in a box" so DVD power really cheap inefficient amps powering 5.1 speakers i could see 150 watts being drawn from the UPS

[bobbytimberlake]

@jeclone No, power and volume have a logarithmic relationship, so "half volume" is only using a few watts.

Every 3 dB gain takes double the power, so you aren't even at half power until 3 dB below max volume. 3 dB below that you're at 1/4 power, etc. All your casual, moderate-volume listening uses <10 watts; it's only when you crank it up to reference levels that you need real power, and once you get there you need tons.

[bobbytimberlake]

@dinnerandashow It's basic physics, not another conspiracy theory. Batteries have terrible energy density, and until you can radically change chemical interactions, it'll stay that way.

[kendrickmeadows]

You should use thicker wire, such as 10ga for the 12v input. as the system kicks over to a battery it is going to heat that speaker wire up really fast... I have a similar setup for my computers internet and a radio linking system...

[GarrettBMXes]

It's highly recommended that you wire it long enough (with heavier gauge wire) to place somewhere such as a garage or outdoors in a decent battery box with good ventilation.