SMT1500C poor runtime?

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I installed a SMT1500C to keep my Blink cameras up during loss of power.

Spec says 50 watts for 5 hours.

I'm using less than 25 watts and the unit states 24 hours+ run time and it Shutdown in 6 hours.

It did not shutdown before battery completely depleted (which is what I wanted).

Is it defective?

Are there parameters to let the voltage sag more to run longer?

All that is on it is a ASUS router 10 watts, NetGear Cable Modem 10 watts, Blink Hub 2 watts

The load is so low that the unit reports zero load.

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Wow absolutely no phone support, chat support or community support. 

Now after one discharge cycle it’s showing 2 hours of runtime. 

So glad I bought this on Amazon. Back in the box she goes. 

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Well I had to dig deep for my own answers since there is near zero support from APC.

I'm not waiting on the phone for 1 hour. Put a call back system in. It is 2022 after all, not 1980.

I'm tempted to return it just due to the horrible support.

Any way what I have learned.

Even though it's not healthy long term you can let the battery deplete completely.

The APC UPS WILL protect the battery from over discharge. Something that was VERY HARD TO FIND.

It is critical it be recharged with in 72 hours and it was recharged within about 1 hour after UPS shutdown.

If you use the APC UPS Guideline you can put in your exact load and it will list what each UPS should run for.

AGAIN really hard to find that info. I thought that  since I found a table that listed 50 watts would do 5 hours I assumed at 25 watts it would do  ~10 hours. Not quite, It will do 7.5 hours. It ran about 6-6.5 hours, close enough.

I have lowered the load to 20 watts and it should run 8 hours, but I'll be happy with 7.

I'm kind of amazed you can't limit discharge level by percent charge or battery voltage. You can only do it in seconds of run time. With calibration so far off the last thing I want to use is time left.

I also learned using the UPS guide that at 20 watts I'm way below the min expected load of 100 watts. This is probably throwing the calibration WAY OFF.

I retested it, and it dropped from 100% to 70% instantly when on battery. I thought that was real bad. But an hour later it was at 71%. 2.5 hours it was at 68%.

So it probably needs to be calibrated. That needs to be a 30% load to do that.