What are you using to monitor current?
The core energy monitoring system is made by Brultech which is called the Green Eye Monitor (GEM):
Energy Monitors | Brultech Research Inc The energy data is captured and stored primarily on the Brultech Dash Box (DB). Energy Management is controlled by the ISY-994 Series Controller which is over seen by my Guardian Watch Monitor (GWM) which manages all of the active / reactive security force protection elements within the home and property.
Below you can see on this specific day the sump pump activated four times. The maximum (RMS) power was 431.48 watts.
Zooming in on one of the activations shows the duration of that cycle began at 7:46 PM and stopped at 7:48 PM or two minutes.
Knowing how large of a backup battery during a grid down event isn't guessing for me. I know exactly how much power or in this case VA (Volt Amps) are needed. You'll notice that during the four cycles several activations required less power. This high lights the importance of being able to track, recall historic events as different conditions will make a piece of equipment operate differently as seen below.
If you were just some random Joe Average and decided to place a clamp on meter at one single moment and it was at the green high lighted time span. You would have mistakingly thought and assumed the most the device required was 400 VA instead of 782 VA!
As seen here the actual current drawn at those intervals when cycled. There's a huge difference between 3.XX amps vs 6.35 amps.
Putting it all into perspective a sump consumes very little energy as seen here.
Now if we take everything we know now we can see if there is a trend or a pending issue about to arise. As you kindly noted the
A Typical hum you normally hear wasn't there. It's only because you went and checked that you found the pump had failed. Imagine you weren't present and the famous:
If a tree falls down in the forest does it still make a sound??
Whelps, we all know if you weren't there to hear the hum of the sump. Upon your return your beautiful home would have been damaged by water!
I don't ever have to worry about if something is on, off, running too long, too short, consuming too much power, voltage is too high / low, in temp, out of temp, I know! The system has been designed to inform me and the family from basic to more advanced whether it be email, sms, voice alert, strobe / siren, to reader board.
Every circuit and individual load is known as to its current state (On - Off) how long its been running, energy consumed, power to start up, if current is within spec, the total costs that second, minute, hour, day, month, year, etc. If the GWM believes there is a out of band problem it will alert me using all of the above and depending upon if I am away / home.
The system will react and activate / terminate the power, water, temperature, fire control, etc.