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  1. First, this project is not my original idea. It belongs to Robert Cummings, aka 2manytoyz. He is not a member here. That is his username on a number of alternative energy forums, though. Here is a link to his original write up on this project, along with these same images. (The images below are his as well, with the exception of the voltage modification I did to the relay schematic.) This transfer switch project, once completed, will allow mains power to power appliances, electronics, etc., until the mains fail. Upon the mains power dropping out, a DPDT relay in the circuit will automatically switch, completing a circuit from your battery and inverter, to your appliances (electric load). NOTE: Keep in mind this particular project was for 120vac service. So, you will have to make sure the coil on the relay is wired for 220vac-230vac, for Cambodia electric service. Here is the schematic: (I modified his schematic for SE Asia voltages.) Here is the relay and base mount (socket): Here is the circuit wired into a work box: And, finally, the completed project: Each end of the three pig tailed cables are labeled: Anyway, as soon as I find a relay and socket, I will be making one of these "switches" myself. One great thing about using one of these transfer switches is, your solar system will not be required to support your load 24 / 7 / 365. It will only be necessary to provide power during power cuts. So, your solar array output can be less, and your battery bank can be smaller. Alternatively, you can use a battery charger that is plugged into the mains, to keep your battery (batteries) charged while mains power is up. So, actually having to use a solar array to charge the battery (batteries) isn't really necessary either, for those who wish to not go through the extra expense. Copyright Robert Cummings, aka 2manytoyz - 2008, 2015
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