Dave Angelini Offgrid Solar <mailto:offgridso...@sti.net>
May 7, 2021 at 3:25 PM
I do not know much about Sol-Arc, but one can AC couple and DC couple
with a Radian or XW. The genset is on the genset input where it belongs.
For Offgrid AC coupling is just another way to damage a battery or
genset that does not need to be there. I suppose in a really large
microgrid with many houses and a skilled person on site, it could be
used as a second best method to DC coupling everything.
*Dave Angelini Offgrid Solar
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On Fri, 7 May 2021 12:21:14 -0400, Jason Szumlanski
<ja...@floridasolardesigngroup.com> wrote:
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Jason Szumlanski <mailto:ja...@floridasolardesigngroup.com>
May 7, 2021 at 9:21 AM
I like the idea of some small amount of AC Coupled PV for off-grid
systems when there is a known consistent daytime load. Around here the
worst case scenario involves afternoon air conditioning in summer, so
some WSW-facing AC coupled PV is an efficient way to cover that load
and go into darkness with full batteries.
If I understand things correctly, with a Sol-Ark you can
simultaneously do AC coupling on the GEN input and DC coupling on the
MPPTs and use the GRID input for the generator.
Jason
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Dave Tedeyan <mailto:d...@sungineersolar.com>
May 7, 2021 at 8:41 AM
I would certainly agree with you all that AC coupled for off-grid is
not the best design choice. But just for clarification, this is a
grid-tied system where there is already an Enphase M215 system and a
whole house generator set up.
Cheers,
Dave
--
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Jerry Shafer <mailto:jerrysgarag...@gmail.com>
May 7, 2021 at 8:10 AM
I have to agree with Dave on this, complex and off grid generally are
not good together, l sugest backing up and you might consider a
redesign, dump enphase, go directly in to the inverter DC side, now a
gen set back up will work. Your spending more time and effort going in
a bad direction. AC coupling for resi is not a great solution to start
with and Solark even say that. KISS is better
Jerry
NABCEP PV Inspector
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Dave Angelini Offgrid Solar <mailto:offgridso...@sti.net>
May 6, 2021 at 7:33 AM
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
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On Tue, 4 May 2021 19:24:13 -0400, Dave Tedeyan
<d...@sungineersolar.com> wrote:
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Dave Tedeyan <mailto:d...@sungineersolar.com>
May 4, 2021 at 4:24 PM
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
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Chris Schaefer <mailto:ch...@solarandwindfx.com>
May 4, 2021 at 1:41 PM
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
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Jason Szumlanski <mailto:ja...@floridasolardesigngroup.com>
May 4, 2021 at 1:03 PM
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
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Drake <mailto:drake.chamber...@redwoodalliance.org>
May 4, 2021 at 12:08 PM
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:
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drake.chamber...@redwoodalliance.org
<mailto:drake.chamber...@redwoodalliance.org>
May 4, 2021 at 7:02 AM
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:
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Dave Tedeyan <mailto:d...@sungineersolar.com>
May 3, 2021 at 7:26 AM
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*
*
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Cell: 607-288-2898
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