[RE-wrenches] Generator and AC coupling on a Sol-Ark
Dave Angelini Offgrid Solar
offgridsolar at sti.net
Thu May 6 10:33:16 EDT 2021
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/ [1]
e-mail offgridsolar at sti.net
[2]
text 209 813 0060
On Tue, 4 May 2021 19:24:13 -0400, Dave Tedeyan
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
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 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 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
1653
Slaterville Road, Ithaca, NY 14850
Cell: 607-288-2898
www.sungineersolar.com [6]
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