Re: Stand-by power supply question

Dave, I can't do that wrote:

Hi people,

I have a Un-Interruptible Power Supply with a dead battery.

Am I correct in thinking that I could remove the dead 7AH gell-cell
and run the wires outside to a bigger battery for longer stand-by time
during an outage?

I have some 25AH batteries here I could use. The 7AH gave me about 5
minutes so would the 25AH give me roughly 3 times as long during an
outage?

Would I also need to add a float charger to the 25AH to supplement any
shortfall in keeping the 25AH fully charged until called upon.

Thanks

Dave
Yes, You can do that. I have done the same thing here. It works very
well how ever, there is a short fall on some UPS units where if a larger
battery is on line it may not see the battery ramping up and current not
retarding. Some units may see this as a damaged battery and fault out.
Also, some units may run a little more heat due to the larger battery
online when charging after commercial is returned, while the load is still attached..

I've done this with three different units to date and haven't yet see
any issues.


http://webpages.charter.net/jamie_5";

.

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