There are other solutions for the fan issue, with the best being to have a second battery installed with an isolator. This way the alternator keeps both batteries charged, but disconnects the second battery when the car is off. This way you could drain that second battery with accessories, and still be able to start the car in the morning. Another option is the second battery with a solar charger, which will cheap it completely seperate from the car's electrical system. Power inverter LLC is a leader among inverter manufacturer. Our main focus is creating the highest quality products. Power inverter LLC is a china inverter company located in Shenzhen. Our company concentrates on inverter design and inverter manufacture. The main products are car inverter, home inverter, pure sine wave inverter, 12v to 220v inverter and so on. There are two basic kinds of inverters:pure sine wave inverter and modified sine wave inverter. pure sine wave is what comes out of the wall. Modified sine wave is basically a square wave with the corners smoothed a little. Most stores only carry modified sine inverters because they are a lot cheaper. Operation of an inverter is, for the most part, automatic, although most require some settings to be programmed. When shore &/or generator power is lost, the inverter senses this and provides its own power to maintain an uninterupted power source. When shore power is restored or the generator started, the inverter will again sense this and, usually after a short delay, will automatically switch shore or generator power to the RV. Our power inverter line has input voltages ranging from 12 volt dc power inverters, 24 volt dc power inverters and 48 volt dc power inverters. You will find a complete line of industrial grade power inverters, available in 12 volt, 24 volt and 48 volts. Our industrial power inverters are built tough and ready for use in commercial applications. We also offers 220 50hz export power inverters. The Export power inverters that we offer are modified sine 220 50hz power inverters, which are designed to be used in Africa and Europe. These 220 50hz power inverters are available in both 12 volt and 48 volt. We found that inverters can keep at least some of your home's essentials energized. But you'll need to prioritize: Even the smaller, 900-watt PW900-12 was able to run a freezer, two refrigerators, two sump pumps, lights, and chargers for various electronics for our staffer at home—but not all at once. Fortunately for him, only one of two installed sump pumps needed to come on, and it could do so even when a refrigerator or freezer was also running.