Separate batteries for lights and separate batteries for kids to watch TV. Trying to limit water pump use. What a PITA! Two six volt batteries doesn’t tell us their AH rating. 300 watts of solar can feed batteries with 300 AHs under “good” conditions. Do an energy survey. Determine your AH needs and multiply by 1.5. Buy batteries with double that storage capacity. Then you can determine how many solar watts are necessary and if your present controller is up to the task. Make sure your wiring is adequate to keep losses minimal.