Hello Bill
Doing so presents no problem to the system or the Mate3.
Lones Tuss
Applications Engineer
OutBack Power Technologies
17825 59th Ave NE, Suite B, Arlington, WA 98223
360.618.4383 Office | 425.213.8794 Cell
www.outbackpower.com
-Original Message-
From: RE-wrenches [mailto:re-wr
Hello folks,
I am composing a response to a question a potential customer asked me. It
seems a competitor is trying to talk him into a 20% larger KW array than the
inverter AC max output rating is. The idea of course is to generate more
power on either side of peak output, but at a cost I don't fe
Kirk,
I would recommend you consider using a tool like PVsyst or Helioscope to
model DC:AC ratios. A quick modeling of roughly 200 kW on three Solectria
50 kW inverters shows about 1.3% clipping here.
It then comes down to analysis of your costs for additional modules, dc
wiring, and inverters.
I'll give a different spin and of course each situation is different and to
be judged on its own facts. Here in Texas, modules on a summer day don't
typically perform to STC ratings and a DC/AC over-ratio is entirely
appropriate. I've brought it up to 1.25 in some cases.
I look at the economics
There are a lot of factors involved, but 20% oversizing (DC/AC ratio), is
not going to result in much clipping in most cases. Clipping only occurs
when the irradiance and temperature are right. Less than ideal conditions
may frequently occur during mid-day eliminating the chance of clipping on
thos
I'm with Matt in terms of Design. I use 1.2-1.35 as a general rule. With
current inverter sizes, you almost always can get a good fit within this
range.
Climate plays a big role on this. As do the costs of your materials and
labor. What we use as guidance is this:
[If I save 5% on a systems cost
Of the many Enphase systems I've done, clipping is a regular issue in
wintertime Vermont, especially with the older micros whose output wattage
ran way below the max. panel wattage. I've seen clipping for 3 hours or more
on super-cold, crystal clear days, with customer complaints about not being
a
Wow!
How old is that array?
Might be a good idea to contact any other clients of yours in the area, to give
them a heads up and maybe push the rodent guard up-sell.
Sent from my iPhone
> On Jul 13, 2016, at 3:36 PM, Kirk Herander wrote:
>
>
> I got a call from a customer saying there wa
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