Solar Panel AC Mains Relay Changeover Circuit

Posted on Feb 5, 2014

The discussed automatic change over relay circuit was requested by Mr. Karimulla Baig. The circuit normally charges the connected battery at constant current through the power received from the solar panel, andrevertsto DC power from an AC/DC adapter in the absence of solar energy (during night time). Lets the read the request in more details: i ha

Solar Panel AC Mains Relay Changeover Circuit
Click here to download the full size of the above Circuit.

ve made the both chargers of both AC mains charger and solar Charger and i need a change over for this kindly help me in designing the change over circuit. Looking at the proposed circuit diagram, we see three basic stages, on the left an IC 741 circuit, at the center a voltage regulator stage using IC LM317, while on the top an AC/DC adapter circuit. The IC317 circuit is a regulator circuit, configured for generating aconstantcurrent, 7 volts output to the 6V battery which is connected at the given points. However, the moment the panel voltage drops below 7 volts, the relay switches OFF, connecting the DC adapter power with the regulator circuit, and now the batterystartsgetting charged through the AC/DC adapter voltage source.

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