Then just as a follow up, I looked at the SMA-41 datasheet. This shows that
it runs at it's highest efficiency when the output power / rated power is
about 0.4 to 0.6, and the only real loss in efficiency comes when you are
running at about 0.1 and below.
On Wed, Mar 3, 2021, 8:35 PM Dave Tedeyan
I've never really trusted PVWatts on this. I just did a quick test using my
location in the northeast, with all the standard values and then just
changing the DC to AC ratio. It's telling me that a ratio of 1.5 is almost
exactly the same as a ratio of 1, and that around 1.3 is best. You actually
lo
Around here a 385W module on an IQ7+ rarely flatlines, even at optimal
orientation. I was concerned that a 420W module at 208V/290W max on an IQ7A
would start to be problematic, but PVWATTS disagrees.
On Wed, Mar 3, 2021, 6:14 PM Chris Worcester
wrote:
> There’s the inverter max output amps, tha
I've used that document many times when clients question the ratio. I wish
I knew exactly how the PVWATTS ratio calculation worked. I know there's
information on how this is all done, but I don't really have the time or
inclination to study it. I'm wondering if someone knows how accurate It is.
On
There’s the inverter max output amps, that’s it. 290 watts for either the 7 a
or 7+ on the 208 VAC, they’re equal for sure. So put on a 420 watt panel but
don’t expect to make a bit more production midday, all you get is a bit quicker
ramp up in the AM and a bit longer 290w output in the evenin
Emphase has a white paper showing production vs module size and locations
around the country.
I don’t know if it’s more accurate than pv watts but you might check it out.
Jay
Peltz power.
> On Mar 3, 2021, at 12:13 PM, Jason Szumlanski
> wrote:
>
>
> I'm wondering how accurate the DC to
I'm wondering how accurate the DC to AC ratio is when using PVWATTS. I did
a quick PVWATTS analysis at my local area using a typical commercial roof
tilt and found that using a 420W module on an IQ7A versus a 385W module on
an IQ7+ yields almost identical results. The 420W module has 1% less
annual
I think whichever system ( Schneider, OB, sol-ark) it has to include closed
loop battery communication.
I really want to try the sol-ark but I won’t until they completely fix their
small 120v load issue.
Jay
Peltz Power.
> On Mar 3, 2021, at 6:30 AM, Dave Tedeyan wrote:
>
>
> The Rad
Good morning all. We have installed numerous Sol-Arks for this type of
application over the last 2 years and they perform so very well. While they do
a great job with FLA’s they really shine with LI’s or maybe it is my bias about
only having to install 1 or 2 large batteries. Technology has bles
The Radian is also the system that I would typically use in this situation.
Although I am interested what people think about using a Sol-Ark inverter
here. I have not used one yet, but I am interested in the fact that
everything is integrated into one box, the string voltages can be up to
500V, and
William,
I agree with you with Radian, Fortress and just add a subpanel identical
to the main grid panel as close possible. Put all critical loads on sub and
larger loads on grid panel. Being side by side, swapping circuits is easy.
I also install an iota charger for generator redundancy. Optic
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