[left]Hey, I need a portable battery that will last for a good number of hours(aiming for 12~), the use of the battery is to power a telescope system, which requires 12v 2-3 amps(what I currently need requires 2 amps, but in case I connect anything else, it would be preferred to have the ability for more) I thought about a few different ways: Deep cycle battery, thats probably the best option for me, but its super expensive where I live, so Im currently looking for other options and ideas. Car battery, which is also a way, but as far as I know car batteries aren't made for being discharged and charged over and over again, which might end the battery very fast and might be a waste of money. I also thought about buying those jump starter power banks, something with like 12-16 amper, which might be ok to use, but again the 12v of those batteries are to start a car etc, and Im not sure continuous use like that would be healthy and good for the battery. One more idea I thought of is buying a bunch of 18650 batteries(like 10-20 which should give me a total of around 32-64 amper), then wiring them together(not necessarily all of them at once), adding a 12v regulator, wiring it to 12v 2-3 amps output(Im not really sure how to do it tbh). What do you guys think? I think a deep cycle battery would probably be the best solution, but its really expensive so maybe there are other solutions I can use, thanks for the help :slight_smile:[/left]

Looking at the main panel in my house I noticed that tandem-breakers are installed in the slots where (if I understand the picture on the door correctly) only ‘regular’ breakers are allowed. [ATTACH]70319[/ATTACH] Should I consider replacing breakers in the designated 'single' slots? What is the reason for the manufacturer to not allow tandem-breakers in specific slots?