1 amp at 12v is 12 Watts , 1 amp for 1 hour is 1 amp Hr aka 12 Watt hrs
Yes 12v after 100 watt hours of use is a bad battery
That should be an 80 amp hour aka 960 watt hour total capacity battery with 400 watt hrs usable
But 100 Watt hours use is fantastically low, that's everything turned off except for maybe the fridge controls
No lights no TV no water pump.. Absolutely nothing
The usage in your OP would account for more than that
What is the amps draw on the meter with the TV and fantastic fan and LED lights on while watching TV
I think the meter is out of calibration or not in line with all power drain
