You can try to diagnose it by going to autozone!
they can do a FREE battery health check🔋
And also can test your alternator, it’s possible you need a new alternator, and or New belts, when they get worn out the electrical system doesn’t charge up to an adequate voltage. This will cause a lower voltage while normal driving scenarios (no heat/AC on, no wipers, day time)
when the voltage is low from the alternator not charging up or low battery health or worn belts, the car will have a power surge whenusing accessories like headlights, wipers, heat/AC, etc etc… hope u figure it out because it’s HOT THERE!!