Convert 24V DC to 24v AC

2Guido
2Guido Solar Expert Posts: 62 ✭✭
in Solar Beginners Corner #1
Hi...anyone know a quick way to covert 24v DC back to 24V AC....my switching relay is 24vac coli and using the DC current from the batteries to switch a low voltage water heater circuit....Help !!!
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  • waynefromnscanada
    waynefromnscanada Solar Expert Posts: 3,009 ✭✭✭✭
    #2
    Re: Convert 24V DC to 24v AC

    Either change out the relay for one with a DC coil - - or - - install a 24 volt to 115 volt AC inverter, then connect a 115 volt to 24 volt AC transformer which would then power the AC relay.
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  • BB.
    BB. Super Moderators, Administrators Posts: 33,660 admin
    #3
    Re: Convert 24V DC to 24v AC

    You could try installing a ballast resistor to limit current flow in the coil... AC coils tend to draw too much current on DC circuits (no AC Impedance to reduce/control current flow). There can be an issue with DC current magnetizing the moving elements and the coil not releasing (have not tried that test myself).

    Otherwise, changing to a DC coil/controlled contactor is probably the best solution.

    -Bill

    PS: I should add it is not impossible to build an "H Bridge" circuit to change DC to AC current if you like playing with electronics.
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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