Calories Burned in a day???

A few weeks back i purchased a Polar Heart Rate monitor and has been a fun little addition to my workouts. Yesterday I decided to experiment and wear it for 24 hours on my rest day and find out how many calories I burn in a day.
I was averaging 130 calories burned in an hour and unfortunetly while I was sleeping something happened and it stopped tracking my heart rate but it got up to 2450calories total burned. Does this seem like a lot or calories? I'm 5'3 31years old and weigh 124 and based on the average calories burned this would mean i burn around 3000 calories a day can i eat that much and maintain and not gain weight or is there something I am missing that i need to factor in??
If so then I think Calorie Count needs to update their formula estimates of how many calories a person burns a day so people aren't striving to deprive their bodies of needed calories.

Did you enter the correct info. into the monitor? Like your age/sex/height/weight and max. HR? W/o knowing your true max HR it won't give you a correct estimate of calories burned.

Yes it looks like everything is entered in correctly

Polar hrms aren't accurate when your heartrate isn't elevated*. The equations used are based on the assumption that you are at an exercise range of heart rates.

As far as I'm aware, the only monitors that are meant to be worn all 24 hours are BodyBugg, GoWearFit, and maybe one other. I've seen posts from people who had them and liked them, but I can't recall anyone offhand who has reported back long-term success with them, so I don't really know if people ultimately find them useful.

*I don't really understand why, but I think I've also heard that they aren't accurate for all exercise - that they are more accurate for something like running, less accurate for biking or weight lifting. But again, I don't know entirely how they work, so not sure how the type of exercise would factor in.

Thanks for the input
I do know Polar has heart rate monitors that are made for weight lifters and ones made for running and other types of activities. I do find my polar is very close to the calculations in calorie count for various activities and also if I use and elliptical it's close but but not exact to the elliptical which surprised me because I always assumed that the elliptical was always wrong.
I do know my maintenance is around 2000-2200 calories so I try to eat around 1800 so as not to lose any muscle