Thanks Highflyer! Here�s an update of where I�m at and what I hope to do in the future based on your advice. You are right that the battery is way too small to do much. Right now, I don�t want the unit running 24/7 because I heard that could lead to fish kill if you aerate too much too soon, so I�m ok with it for now. I do want to upgrade in the future (hopefully before winter to prevent freeze), and I�ll probably get two 6v deep cycle batteries. Currently the pump runs fine from about 9:00-7:00 which is great for now, but it will run the battery too low. I believe the inverter shuts down and alarm goes off at 10.4v. I also believe the inverter has a built in fuse. Do you still think I should put another one in? I really like your idea of a timer that would be a good cheap solution for now. I was also actually looking into a low voltage shutdown that I think would be ideal for me especially if I end up spending more on batteries. From what I understand draining the battery to 10.4 will damage it eventually, plus with this device I wouldn�t have to worry about draining the batteries on cloudy days (which could still happen with the timer). Here is a link to it.
https://mwands.com/shop/product/battery-protection-switch#
