I think it's awesome that you're actually taking the time to consider the implications of accepting a management position. I've known so many people who focus on the nicer office, better pay, better benefits, etc., and never consider there's a reason why managers get better treatment... it's because they're going to have to earn it by taking on a lot more stress, responsibility, work hours, etc. These folks think their life is going to be just kicking back and telling people what to do, and when the reality of how much their level of effort is going up strikes them a lot of bad things happen.
As for your concerns, you can expect to spend a lot more time on the job, especially if you're taking a salaried/exempt position, but on the plus side you'll also be able to better enjoy the time you have with your family. Your kids won't remember those nights they were playing video games while you were watching TV, but they will remember the time you took them to Disney for the weekend, or Friday nights at the theater, or camping trips with the camper you bought, so it all evens out.
I think your most important consideration is that taking this position expands your desirability as an employee. Right now you're a maintenance technician. If you take the job, you'll be a manager of some type of worker, and quickly you'll be recognized as a manager and then a supervisor. This is a huge benefit to you if you have to, or want to, pursue other opportunities outside the maintenance field. The more diverse your experience and qualifications are, the more diverse your job opportunities are, and that's always a good thing.