Wiring a second string to A/C cutoff sw?

st2288
st2288 Registered Users Posts: 9 ✭
in General Solar Power Topics #1
Currently I have a string of 12 sharp 235w into a Sunnyboy 4000w inverter (2800w max). I want to add 3-200w (600w) canadian solar using enphase inverter.

My question is can I wire the output of the enphase inverter (240v) into the sunnyboy A/C cutoff switch (on the same side) ? The other side of the cutover switch feed back to a 30 amp breaker in the panel.


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  • st2288
    st2288 Registered Users Posts: 9 ✭
    #2
    Re: Wiring a second string to A/C cutoff sw?

    I wire the output of the enphase inverter (240v) to a ac cutoff. I tied the Sunnyboy ac output to the output of cutoff switch. I can't wire directly into the outdoor switch because the utility company place a tag on it.

    enphase ----> cutoff ---->
    > Outdoor AC cutoff.
    |
    |
    Sunnyboy (AC output) ---|


    Dont know if that make sense
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  • drees
    drees Solar Expert Posts: 482 ✭✭✭
    #3
    Re: Wiring a second string to A/C cutoff sw?

    Not quite clear what you've done, but if you want to only use one AC disconnect, you need to combine both the PV circuits into a single panel using a sub-panel.

    Your sub panel will probably have a 20A breaker for the SunnyBoy 4000 and a 15A breaker for your Enphase circuit.
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