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Switch from solar to battery

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ioma

New Member
I have fan (12v -0.9a) which use power from a solar panel.The obvious problem is that when is dark or there are clouds the fan stop.I want to make a circuit with relay which when there is no power from the panel the circuit switch to battery and the battery give only 6v to fan.Is this possible;
PS Sorry for my bad English
 

mneary

New Member
You can do this with two diodes.

[Sorry it was too late last night to make the drawing.]
 

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mbarazeen

Member
how are you going to charge the battery?

to use two diodes, make the common connection your fan negetive terminal battery negetive and solar panel negetive together. put a diode anode side to the bettery positive and the cathode (normally maked in white) to the fans positive, same another from solar panel (+ve) to the fans positive. until the solar panel out put drops bellow your battery volagte it would be powered from the panel and then from the battery.
 
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