How do I extend the life on a battery backup system or "uninterruptible power source" (UPS) for a computer?

Question

I have one of those backups that look like a surgebar. It has 8 outlets. I was contemplating on taking it apart (after I turn it off and let it sit obviously) and looking at the battery inside and maybe getting a battery with matching voltage that has more capacity. Another idea was to hook up more then one together. Such as, #1 plugged into the wall, #2 plugged into #1, and so on. It would be excellent to have a much longer tim then 15 minutes. Obviously, if the computer is on standby and the monitor is off, I know the battery will have a charge a lot longer.

Reason why I want to know this? I have a computer hooked up in my car. Don't ask, that is not what this post is about. Anyway, by having an extended backup system completely seperate from the battery, I could have my computer on in the touch of a button, by coming off standby, without having to wait for it to start up. It may actually be possible to extend this for several hours if I would guess using a seperate ca

(cont'd)... car battery. I am very technilogially inclined so I could do this. My only what-if questions are this.

1) If I use a larger capacity battery, is the charging circuit going to be able to charge it to capacity?

2) If I choose to leave the battery the way it is and hook up several UPS together back to back, wouldn't one backup be unsing more power because it is drawing current to power and charge their own battery?

3) With the space provided in my trunk, I could do up to 6 UPS's without sacrificing space. With adding more UPS and maybe a larger capacity battery or not, what are the realistic numbers of longevity till empty if when the computer is drawing from these UPS's, its on standby?

IN REGARDS TO SIMON'S COMMENT:

It seems you don't get it. Obviously, if I am hooking up UPS's to my car, I ALREADY have a power inverter big enough for my computer. What i am using this for is to put my computer on standby for large lengths of time in my car with it being off. Therefore, after a few hours, I can return to my vehicle and take it off standby without having to reboot. Do you underdtand now? I hope it is clear. Sorry for the misunderstanding.

Answer 1

Why bother?

Get a power inverter for your car big enough to run the PC.

You may want to keep the UPS in there for the disconnect when you start the engine.

You could just wire the inverter directly off the battery, but:

1) You are going to drain your battery over time.
2) The voltage drops significantly when you start the engine. The inverter will increase the current it draws to meet whatever power demand is on it. If you have significant power draw when you crank the engine you are could over-current the wiring, the fuse or the connectors of the inverter.

Answer 2

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