Solar not working right
I installed a solar system on my rv and it doesn’t seem to be working properly. Mainly, after the batteries are fully charged they drain much faster than I think they should. I have 560 watts of solar panels and four brand new 75 amp hour deep cycle batteries. The solar seems to charge them wonderfully especially on sunny days. One example of the battery drain: Batteries we’re reading 12.6v, turned on inverter ( 3000w pure sine inverter) to charge phone. After 1 hour the battery is reading 12.2v. This is with nothing else plugged in to draw power and with one led light on. I am a solar beginner and at a loss. Any help would be greatly appreciated!