Solar Panel Power Supply Circuit

The post discusses a simple relay changeover circuit for managing a sustained power to the connected battery via a solar panel and a mains operated smps power supply.

Solar panel power supply circuit.

The solar panel will deliver about 10 15ma on bright sunlight so any load on the output should be as small as possible. With a solar cell if you connect the amp meter to the cell without a load the current will climb like a battery or a power supply but the current will stop climbing once it reaches 8 of the energy of the sun. In this next circuit we use the solar panel to charge up a nimh rechargeable battery and also led off of the power which will stay on when it gets dark out. Ac electricity flows through every outlet of your home powering the appliances.

Ideally the sun rays should be incident over the surface of the panel for it to function optimally. If you take a standard 60 cell panel it should output at least 6 7 amps at about 30 volts. When the power supply voltage is too low the relay is not on so the battery is not connected to the solar panel. Set the power supply output to a level that is 0 1 v higher than the current battery voltage.

The wires from the solar panels will be presented with dc power in mind as will the end of the inverter where the wires have to be connected. It isn t a very pretty circuit in the sense that it wastes power but it will give a similar behavior to a solar cell. Between the two is a reverse blocking diode. An example is information logging exactly where the micro is active for short periods of time then goes into sleep mode.

The idea was requested by ms rina. When the voltage is high enough to engage the relay and the ldr receives enough light in order to open t1 the relay will switch and the battery will charge. In dc wiring the black wire is positive the white wire negative or neutral in an ac wiring setting and the green wire is the grounding wire. Dc is then converted into alternating current ac through a device called an inverter.

That doesn t mean this is safe to do in all cases just some solar cells will not be damaged by it. Solar panel battery mains changeover relay circuit. The power generated from a solar panel is normally used for charging a lead acid battery. In this circuit the solar panel charges up a 3 cell nimh battery 3 6 v.

It uses a power supply that can operate as a constant current source and a bunch of power diodes. The lead acid battery when fully charged is used with an inverter for acquiring the required ac mains voltage for powering the house electrical. The solar panel pv that receive the sun s rays and convert them into electricity called direct current dc. Next adjust p1 so that the output of ic 1 just becomes logic high.