[RE-wrenches] Generator and AC coupling on a Sol-Ark
Ray
ray at solarray.com
Thu May 6 11:20:58 EDT 2021
I second that.
Ray Walters
Remote Solar
303 505-8760
On 5/6/21 10:33 AM, Dave Angelini Offgrid Solar wrote:
>
> I would not do any of this for an offgrid client. It is against the
> rule of less is more. The whole design is flawed in my opinion.
>
>
> *Dave Angelini Offgrid Solar "we go where powerlines don't"
> http://members.sti.net/offgridsolar/
> <http://members.sti.net/offgridsolar/> e-mail offgridsolar at sti.net
> <mailto:offgridsolar at sti.net> text 209 813 0060*
>
> On Tue, 4 May 2021 19:24:13 -0400, Dave Tedeyan
> <dave at sungineersolar.com> wrote:
>
>> I suppose the question here is - which is the worse failure mode?
>> A. Solar turning off until an electrician can fix it.
>> OR
>> B. Not knowing the contactor failed until it does not open when the
>> generator turns on and running the risk that the solar backfeeds the
>> generator and breaks it.
>> For off-grid maybe A would be more of a concern. But for grid tied, I
>> would think option B would be worse.
>> Does anyone have a fail safe method of doing this?
>> Cheers,
>> Dave
>>
>> On Tue, May 4, 2021, 4:41 PM Chris Schaefer <chris at solarandwindfx.com
>> <mailto:chris at solarandwindfx.com>> wrote:
>>
>> Jason,
>> A valid concern which is why I always wire them as powered open
>> so if there is a failure it would transition closed or not open.
>> Christopher
>>
>> On Tue, May 4, 2021 at 4:15 PM Jason Szumlanski
>> <jason at floridasolardesigngroup.com
>> <mailto:jason at floridasolardesigngroup.com>> wrote:
>>
>> What happens when the contactor fails? I don't trust a NC
>> contactor that is supposed to open on 240Vac coil voltage
>> from the generator. It's not a failsafe solution.
>> Jason
>>
>>
>> On Tue, May 4, 2021, 3:15 PM Drake
>> <drake.chamberlin at redwoodalliance.org
>> <mailto:drake.chamberlin at redwoodalliance.org>> wrote:
>>
>> P.S. The contactor method is even mentioned somewhere in
>> the Outback literature. I've been using it for years. It
>> is very simple and requires no complex equipment. It will
>> not interfere with rapid shutdown. 40 A, 240 V contactors
>> with 240 V coils are readily available and not terribly
>> expensive. The 240 V output of the generator circuit
>> provides the signal.
>>
>> At 10:02 AM 5/4/2021, you wrote:
>>> Get a contactor with a 240 VAC coil. Connect the coil
>>> wire wires to the 240 V output circuit of the generator,
>>> so when the generator comes on, the contactor opens. Run
>>> the current from the AC coupled Enphase inverters
>>> through the contacts from common to N/C.
>>>
>>> ---
>>>
>>>
>>>
>>> On 2021-05-03 10:26, Dave Tedeyan wrote:
>>>> Hi All,
>>>>
>>>> I am planning on using a Sol-Ark for the first time for
>>>> adding battery backup to an existing system. It is
>>>> Enphase, so clearly it will be AC coupled, and there is
>>>> a whole house generator. When I talked to Sol-Ark about
>>>> it, they recommended putting the generator on a time of
>>>> use schedule to not allow it to come on during the day
>>>> so that we don't run into the issue of the solar
>>>> backfeeding the generator.
>>>>
>>>> I was wondering though if anyone has just used a
>>>> contactor to cut out the solar when the generator turns
>>>> on? Something like Outback's GS-AC-Gen-Kit, although in
>>>> this case I will need something rated for just over
>>>> 30A. This seems like a better way to allow the
>>>> generator to run at any time it is needed, especially
>>>> if it is a gloomy, snowy, winter day.
>>>>
>>>> Cheers,
>>>> Dave
>>>>
>>>> --
>>>> *Dave Tedeyan, PE
>>>> * Sungineer Solar
>>>> 1653 Slaterville Road, Ithaca, NY 14850
>>>> Cell: 607-288-2898
>>>> www.sungineersolar.com <http://www.sungineersolar.com/>
>>>>
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>> --
>>
>> Chris Schaefer's
>> <http:www.solarandwindfx.com>
>> /Tel/Fax 585-229-2083 or Cell 585-748-1870
>> //5115 South Hill Road ~ Canandaigua New York 14424
>> //www.solarandwindfx.com <http://www.solarandwindfx.com> ~
>> E-mail: chris at solarandwindfx.com <mailto:chris at solarandwindfx.com>/
>>
>> /
>> /
>>
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