Thanks Brian for the welcome!
using 3 Renogy 100w panels (300W) will be using a 40a controller- AGM 12v battery 100ah. inverter will be according to the pump requirements. Looking for aeration at this time.
Using your panels, you can expect to make no more than 1.8 kWhs a day. In reality, you will only see something like 1.1 or 1.2 kWh a day of production. If you want 24/7 aeration, you can see the best you can use is 1.1 kWh/24 hours = 45 watts continual usage. Next you need to see what that will do to your batteries. 45 watts is almost 3 amps multiply that times a 14 hour drawn down over night (winter months) and you will see 42 amps drawn out of your battery or more over night, every night. Your battery will not last very long at that level or usage. Now add some clouds and you can see your problem.
Figure out your load first. Then figure out how much you need to store. Then finally figure out how you are going to produce that much energy.
Don't worry, you are not the first to do it backwards. This is fixable. But start with the load and work your way through the problem.
