The Fronius Primo line is a single phase product that is rated for 1000VDC.
-Wes Kennedy
On Tuesday, September 18, 2018, 7:28:24 PM MDT, Jay <[email protected]>
wrote:
Does anyone make a 1000vdc single phase inverter?Would reduce wire costs
dramatically
JayPeltz power.
On Sep 18, 2018, at 11:36 AM, Lorenzo Ortiz <[email protected]> wrote:
Thanks for all the input guys. After looking at the 3 phase with transformer
options with some transformer manufacturers, that has been pretty much ruled
out due to complexity/cost. With single phase step-up and step-down
transformers, even at 600VAC, it still requires some monster wire.The best
solution seems to be placing the inverters next to the POI and just running
long strings from the array back to the inverters and accepting up to 4%-5%
voltage drop. And that's with #8 instead of the usual #10 AND accounting for
worst-case production.
Man, sometimes this solar stuff is just crazy...
On Tue, Sep 18, 2018 at 10:15 AM, Blake Gleason <[email protected]>
wrote:
Good advice already on this thread. A couple of points to consider:
1. Re: step-up/step-down option (probably what I'd do): definitely pay
attention to transformer spec to minimize both magnetization and operating
losses. Newer DOE 2016-compliant transformers are MUCH better than before, and
that's just the minimum standard. If you really want to minimize magnetization
losses, you can always design a relay/timer to disconnect the transformers at
night (from the interconnection side), although I've found that this setup is
either very expensive or too unreliable (nuisance tripping upon re-connect,
timer gets "off" cycle somehow, etc).
2. I think someone mentioned a 480V single-phase inverter. I'm not aware of a
high-quality product meeting that description. Is there one? All of the
"480V" single-phase inverters I'm aware of are 277V (line to neutral), which is
hardly worth the transformer effort (versus 240V).
3. Definitely use aluminum wire for the long run. If wire size is still too
large, even with step up/down tranformers, consider allowing slightly increased
voltage drop at full power (say, 5%), and, depending on typical grid voltage at
the site, change taps on one of the transformers to err on the low side (from
inverters' point-of-view), to keep the inverters from tripping at upper voltage
limit at full power (max voltage drop/rise).
Blake
On Tue, Sep 18, 2018 at 9:57 AM, Jerry Shafer <[email protected]> wrote:
LorenzoYou might want to look at relocating the inverter(s) closer to the meter
instead of the array, one reason is even if there is some line loss at full
power its less as the voltage goes up and the inverter does not see the line
resistance that can cause high voltage issues at the inverter. Some engineers
use more side of peak performance than full power, this keeps wite size down
and does not effect outputJerry
On Sep 17, 2018 9:42 AM, "Lorenzo Ortiz" <[email protected]> wrote:
Wrenches,
We have a PV array situated about 900' from the POI (240V 1PH). We initially
spec'd (5) 11.4kW inverters and the combined output would be 238A. The wire
size required for this current over that distance is cost prohibitive.
A solution was to use a single 50kW 3 phase inverter at the array and then
convert it to 240V... somehow? Is anyone familiar with how to go about doing
this? My thought was to have a step down transformer at the POI and pull off
two legs to get 240V. Is this even a thing?
The other, more expensive option is to use a step up transformer at the array
and a step down at the POI to get us a smaller wire size.
Thanks for any input.
--
Loren Ortiz Commercial PV Designer
[email protected] (530) 274-3671
Showroom located at: 149 E Main St. Grass Valley, CA
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Showroom located at: 149 E Main St. Grass Valley, CA 95945
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