I saw a commercial for a product called "Power-Save". It is basically a capacitor that you can install yourself on your main breaker box that is "supposed to" save you energy by storing electricity to help start motors such as Air conditioner compressors, refrigerators etc. Can you tell me if it is worth the investment of almost $300.00? It seems to me that your Microwave and your A/C compressors already come with its own capacitor. So Howcan this really help?....Is this a scam do you think?