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This is between an off-grid project and a mains electrical project. So, I wasn't really sure where I should post it. The Mains, Solar, Wind & Hydroelectric Power forum won. So, it just so happens that I have 3 - 100 watts panels sitting around collecting dust, and not producing a single watt of power. I also have 135 watts panels doing the same. So, I need to come up with a little project for them. Anyway, the 100 watts panels project, for now. I am going to buy a (cheap Chinese made) 6oo watts grid-tied inverter. I will then connect the 3 - 100 watts panels in parallel, directly to the inverter. Then, I will plug the inverter directly into a mains power point (wall receptacle). That will sync with the mains and start pumping up to 300 watts directly into the electric veins of the farm, depending on the amount of sun they receive, of course. This will help alleviate some of the power needed from the mains to run the farm. Anyway, these inverters run between about $82 USD to $120 USD, each. That would buy you a 500 watts, up to a 1000 watts grid-tied inverter. The reason behind powering a 600 watts grid-tied inverter with only 300 watts of panels, is so as not to overdrive it and possibly cause it to fail, catch fire, etc. The last thing you want to do, is to overdrive a cheaply made inverter, or any inverter for that matter. Besides, you can always buy another inverter, and three more panels to connect to it, then plug it into the mains. The second inverter will sync with the first, as well as the mains voltage. Also, when you experience a mains power failure, these inverters will automatically shut down in order to protect anyone who may be working on the cables. You certainly don't want to be responsible for someone getting electrocuted. I know I don't. Once power is restored, they will come on line again. Anyway, as soon as I get around to ordering one of these, and receive it, I will give you good folks an update on this little project. If this works out okay, I will definitely expand the system so as to reduce our power bill even more, each month. SUMMARY: A grid tied system can help you kill your power bill, by back feeding power into the mains. It is as simple as installing an array of solar panels, connecting them to a grid-tied inverter, and connecting the grid-tied inverter to your mains power in your home.