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Parallel switch with Solid state relays (Mosfet) and Mechanical relay

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Arya Kumar

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Parallel switch with Solid state relay(Mosfet) and Mechanical relay

Hello experts,
I am working with Solar Charge controller. For charging battery with solar there is a diode (.3v junction difference) between Solar positive and Battery positive.
Diode protects the flow of current from battery to solar. That's good but during day time it makes up a good power loss (.3 volt X Current) so i need a heavy heat sink.
My idea is using diode and Relay in parallel. During day time relay will switch on and maximum current will flow from relay, thus there will be less power loss.


WILL THIS BE GOOD IDEA. ???
i will be measuring current to get it is day or night and will then get logic to turn on and off relay.!!
 

Re: Parallel switch with Solid state relay(Mosfet) and Mechanical relay

How much current does it takes to charge your battery? does your diode takes that into consideration? maybe you just need a bigger diode...

anyway, I don't think you should have any problem using a relay, maybe add a snubber and a hysteresis/voltage level driver to minimize switching noise...
 

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