A simple and super inexpensive(15dollars) solution to your dilemma is to go on Amazon and purchase yourself a marine/rv disconnect switch. Most diy solar systems use these due to the low cost, I do as well.
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@book-of-wild thanks ill check them out
I would agree with @book-of-wild
The VSR's would probably not be the best option as they would become a lot less effective as the battery ages and dissipates quicker.
Adding another battery may help as well, but you may need to look at the load on the photocell. I'm assuming that the temp-regulating fans and irrigation pump are running during daylight hours, while you are also charging the battery. Adding a battery may add load to the system to the point they are not getting fully charged or proper maintance voltage once they are charged or this could be part of the issue you are having right now.