I also forgot to mention that your battery's DoD rate and charge rate and discharge rate in terms of amperes is crucial. A lower specification or quality battery will take longer to charge to full capacity and will discharge power for usage at a slower rate.
Firstly. You have to know what is your current energy consumption during the day. You have to know your current load demand. Try to reduce your energy demand during the day so you can more available energy for storage. Thirdly , check if your panels are receiving uninterrupted sunlight ( no...