Adding extra capacity to a car's electrical system to run air conditioning (AC) while parked under direct sunlight for an extended period can be a challenging task, and it might involve modifications to the vehicle's electrical system. Here are some general steps and considerations, but please note that modifying a car's electrical system should be done carefully and preferably by a qualified automotive professional:
Assess Electrical System Capacity: The first step is to assess the existing electrical system's capacity and determine whether it can handle the additional load of running the AC for an extended period. This involves checking the alternator's output capacity, the battery's capacity, and the wiring's ability to handle the increased load.
Upgrade Battery: If the existing battery's capacity is not sufficient to handle the extra load, you might need to upgrade to a higher capacity battery. A deep-cycle battery or a dual-battery system could be considered to ensure there's enough power to run the AC without draining the main starting battery.
High-Output Alternator: If the car's alternator doesn't produce enough power to handle the additional load, consider upgrading to a high-output alternator. A high-output alternator can provide more electrical power to charge the battery and run the AC system.
Wiring and Fuses: Ensure that the wiring and fuses in the electrical system are capable of handling the increased load. Upgrading to thicker gauge wiring and installing appropriate fuses can help prevent electrical issues and potential hazards.
AC System Modification: Some vehicles may have AC systems designed to work only when the engine is running. Modifying the AC system to run independently of the engine requires careful consideration and technical expertise. It might involve installing a separate AC compressor and components that can be powered by the electrical system.
AC Controller and Timer: To avoid draining the battery excessively, consider installing an AC controller or timer that allows you to set specific intervals for the AC to turn on and off. This way, you can use the AC intermittently to maintain a comfortable temperature without depleting the battery completely.
Solar Panels (Optional): In certain cases, solar panels might be installed on the car's roof to help recharge the battery and provide additional power to the AC system. However, this option requires careful design and integration to ensure proper functionality and avoid damage to the vehicle.
Remember that modifying a car's electrical system can have implications on warranty, insurance, and safety. It's essential to consult with a reputable automotive technician or electrician who has experience with these modifications and can advise you on the best approach for your specific vehicle model and requirements. Additionally, local regulations and laws might govern modifications to a car's electrical system, so it's crucial to comply with these regulations.