Deep cycle Battery for a UPS?

**Falcon62Travis** · 04-26-2001, 01:35 PM

I have an old UPS with a dead battery. I am thinking about buying a deep cycle battery and using it to replace the battery in the UPS. I figure that would give me about 30 minutes of power if the power went out for that long.

Is there anything I need to look out for? I'm not sure what I can do about corrosion because this battery will be inside my house. I saw a website earlier about doing something like this and if I can find it I'll post it here.

**Aaron Cake** · 05-03-2001, 12:16 PM

This will work fine. However, don't count on the UPSs charger to bring the battery back up from completely dead. The current draw of large deep cycle batteries will most likely trip overload protection. For what it's worth, I have three marine batteries paralleled on the UPS on my server. Good for like 12 hours run time...

If kept in a place like a basement with adequate ventalation, gassing is not much of a problem. Hydrogen gas dissipates really quickly.

**Falcon62Travis** · 05-03-2001, 01:53 PM

Thanks Aaron.
I'll just precharge the battery before I connect it to the UPS. Could I also connect a trickle charger to the battery to keep it charged or would I have to worry about the trickle charger interfearing with the UPS?

**Aaron Cake** · 05-03-2001, 04:21 PM

In theory, a trickle charger will work. However, I wonder about the effects of it on the UPSs battery charger. As I mentioned, the UPS battery charger should be able to keep the batteries charged, but will probably not be able to charge them from dead.

**95rodeo** · 10-17-2007, 05:01 PM

Bump

**jjh221** · 10-17-2007, 05:29 PM

**95rodeo** · 10-17-2007, 05:57 PM

btw i was talking about the cat in your avatar

**Crawdaddy** · 10-18-2007, 08:41 AM

If I remember correctly, most UPSs run off of 24 volt batteries. So, if you put 2 batteries in serial, you'll have 24 volts. I've read multiple articles about people doing this. One particular one comes in mind where a gentleman hook up a laundry room's worth of deep cycle batteries to a UPS to provide a ridiculous amount of runtime. I think that person's goal was a house backup, not just computers and servers...

**Aaron Cake** · 11-07-2007, 11:42 AM

Most smaller UPSs are 12V units. In most cases, you only get to 24V when you reach the 500W level.

Connecting batteries in parallel increases current, not voltage. To get 24V, you need to connect two equally sized 12V batteries in series.

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