Question 1

What kind of audible alarm does this unit have?  Is it a simple beep and it over, or is it like a screeching banshee chasing its prey?

Accepted Answer

Our model produces a continuous high-pitched beep that wouldn't stop until forced shutdown by depressing the power button for several seconds (like a laptop).

Question 2

How long can the battery keep on a 800 watt machine when the power is off?

Accepted Answer

Just because you have an 800W supply does not mean you are using 800 watts.  I have an 800 watt supply and it typically uses only 90-110W.  However I never got close to the advertised run times even with a brand new battery.  I got about 75-80% of the advertised run times even with a calibrated 30% load.  Also the run time that the machine reports is also a bit optimistic.  When it was new it was claiming around 60 minutes and was getting about 50 at best.  Now that the battery is 3 years old, it only reports about 28 minutes and but only can hang on about 18 minutes.

Question 3

Description says surge protection is rated at 355 joules  -- not much protection at that low rate.  Is this correct?  Thanks.

Accepted Answer

You are correct.  APC's site lists it at 354 joules.  That is pretty low compared to a good power strip at nearly 10 times that rating.  If you live in an area with surge problems (i.e. lightning), then you could plug the UPS into a good power strip first ... or rely on APC's connected equipment protection warranty.

Question 4

If the input/output voltage for the addon battery pack is 12vdc, could a deep cycle be used by the unit in theory? The packs that power it are simply sealed wet cells anyway.

Accepted Answer

The original battery pack is rated at 9Ah. The external battery pack is about 18Ah.  Meaning the charging circuit is designed to manage safely  a 24 Volt 27 Ah  battery set safely. The UPS has a fan which start when required,  so I think you could go up to a couple of 12 Volt 35 Amp AGM type battery in series without any risk but after that size I think  it's too much for this UPS model and will take too much time to fully recharge the batteries and perhaps overheat it.  Also keep in mind if you hook a USB cable to feed UPS status  info to a  computer,   the UPS will report a false reserve time and will force to shut down the computer well before  it's discharged.

ASIN	B0047E5B90
Amperage	24 A
Battery Cell Type	Lead Acid
Best Sellers Rank	#47 in Computer Uninterruptible Power Supply Units
Brand	APC
Built-In Media	Back-UPS Pro External Battery Pack (for 1500VA Back-UPS Pro models), User manual
Color	Black
Connector Type	IEC 320 C13
Customer Reviews	4.7 4.7 out of 5 stars (473)
Enclosure Material	Information Not Available
Form Factor	Rack
Frequency Range	50/60 Hz (± 3 Hz)
Global Trade Identification Number	00731304268789
Item Dimensions	19.5 x 16 x 9.5 inches
Item Dimensions D x W x H	19.5"D x 16"W x 9.5"H
Item Part Number	BR24BPG
Item Weight	15.4 pounds
Manufacturer	APC
Maximum Power	865 watts
Mfr Part Number	BR24BPG
Model Number	BR24BPG
Number of Items	1
Number of Outlets	8
Output Current	24 A
Output Voltage	24 volts_of_direct_current
Output Wattage	1000 watts
Power Plug Type	No Plug
Runtime	5 hours
Specification Met	No
UPC	731304268789
Unit Count	1 Count
Voltage	12 volts
Warranty Description	2 years repair or replace
Wattage	865 watts

APC External Battery for Extended Runtime for Back-UPS Pro Model BR1500G

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