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 Post subject: Nice efficiency, fun with fishbowl
PostPosted: Sat Apr 12, 2003 4:46 pm GMT EthGMT 
<BLOCKQUOTE><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><HR>Originally posted by Gordon:
Arnold,

If you clean your array, I'm going to have to clean mine! I was down to 19.33 kWh yesterday, the high air temp was 90 degrees F. You've got a little bit larger array and cooler weather, I'm worried.

Gordon
<HR></BLOCKQUOTE>

Well I didn't clean it but Mother Nature is doing its best today.

The larger array is offset by being east facing.

I haven't even come close to 20 in recent days. 19.94 kWh still stands as my high water.

arnold


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 Post subject: Nice efficiency, fun with fishbowl
PostPosted: Thu Apr 17, 2003 2:32 am GMT EthGMT 
Henry, Arnold, et al,

We did it. Our system produced 20.02 kWh on April 16th. Perfect clear, cool day. I forwarded the file to Henry. My best ever with old St2500 was 18.8 kWh.

Gordon


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 Post subject: Nice efficiency, fun with fishbowl
PostPosted: Fri Apr 18, 2003 12:11 am GMT EthGMT 
Congratulations.

We haven't had any clear days recently. Maybe Saturday I can get 20kWh day.

I did have an impressive partly cloudy day performance of over 19kWh. The graph showed some nice spikes in the morning and afternoon, probably from edge of cloud effects.

arnold


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 Post subject: Nice efficiency, fun with fishbowl
PostPosted: Tue Apr 22, 2003 1:30 am GMT EndGMT 
I had two inverters do over 20 Kwh on Saturday.

arnold

[ April 22, 2003: Message edited by: Arnold de Leon ]


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 Post subject: Nice efficiency, fun with fishbowl
PostPosted: Tue Apr 22, 2003 2:12 pm GMT EndGMT 
So, you have set the world record for the most ST units producing over 20 kWh each! What was your all-time best totals for the old ST units (pre XR Beta)?


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 Post subject: Nice efficiency, fun with fishbowl
PostPosted: Tue Apr 22, 2003 11:18 pm GMT EndGMT 
I don't have pre XR data. I didn't have the old units for very long and I didn't have any reasonable instrumentation (I didn't have fishbowl yet). Remember the pre XR systems were pretty awful with their on board LCD display.

Interestingly enough it wasn't a "perfect" day. There were some cloud passes.

Here are the numbers for the 3 inverters:

20.315 kWh
20.478 kWh
18.419 kWh

arnold


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 Post subject: Nice efficiency, fun with fishbowl
PostPosted: Fri May 02, 2003 5:15 pm GMT EndGMT 
A very interesting improvement in the XR Upgrade is how the MPPT harvests energy on patchy cloudy days. The existance of patchy coulds only seems to reduce my energy production by a few percent! The XR now does such a good job of harvesting cloud edge reflections that the total effect of clouds is often reduced to nearly nothing -- I'm getting more energy production of patchy cloudy days than I used to get on clear, cool perfect days with the orginal ST25000.

Gordon


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 Post subject: Nice efficiency, fun with fishbowl
PostPosted: Fri May 02, 2003 10:06 pm GMT EndGMT 
Yes, it is really apparent when the inverters aren't at full power output. The dips are often surrounded by spikes.

arnold


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 Post subject: Nice efficiency, fun with fishbowl
PostPosted: Tue May 27, 2003 11:53 am GMT EthGMT 
Offline
Goldfish
Goldfish

Joined: Fri Jan 31, 2003 2:01 am GMT EstGMT
Posts: 97
Location: Long Island, NY
Hi,

Now that several of you have been running FishBowl on the upgraded inverters with large arrays for a while, is there any better idea on what the largest array size to use on a Sun Tie GP 2500 without maxing out the inverter on cloud enhancement too much?

Thanks,

Ron


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 Post subject: Nice efficiency, fun with fishbowl
PostPosted: Tue May 27, 2003 2:53 pm GMT EthGMT 
Ron,

I been thinking about this very issue. My Inverter power limits on all cloud enhancements, except in early mornings or late afternoons (meaning times when the output would otherwise be, say 1200 to 1700 watts AC) with my 3600 watt array. I have been thinking about running some tests with one circuit disconnected (3000 watts) to see what happens -- of course it is hard to power down!

Gordon


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 Post subject: Nice efficiency, fun with fishbowl
PostPosted: Tue May 27, 2003 3:34 pm GMT EthGMT 
Offline
Goldfish
Goldfish

Joined: Fri Jan 31, 2003 2:01 am GMT EstGMT
Posts: 97
Location: Long Island, NY
Hi Gordon,

Are you power limiting near noon on clear days too?

Ron


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 Post subject: Nice efficiency, fun with fishbowl
PostPosted: Tue May 27, 2003 11:40 pm GMT EthGMT 
<BLOCKQUOTE><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><HR>Originally posted by Ron Schroeder:
Hi,

Now that several of you have been running FishBowl on the upgraded inverters with large arrays for a while, is there any better idea on what the largest array size to use on a Sun Tie GP 2500 without maxing out the inverter on cloud enhancement too much?

Thanks,

Ron
<HR></BLOCKQUOTE>

FWIW, the one inverter I have that has 3400 watts of panels (40 BP-585s) also sees limited power output around solar noon on clear days.

arnold


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 Post subject: Nice efficiency, fun with fishbowl
PostPosted: Wed May 28, 2003 8:06 am GMT EthGMT 
Offline
Goldfish
Goldfish

Joined: Fri Jan 31, 2003 2:01 am GMT EstGMT
Posts: 97
Location: Long Island, NY
Hi Arnold and gorden,

It looks like 3300-3400 is a little more than necessary for the upgraded inverter. Unfortunatly, I don't have enough space that isn't shaded by the neighbors trees to have that problem. [img]images/smiles/icon_rolleyes.gif[/img]

I am meeting with several people here at work at lunch today that probably will be adding solar to their houses. They are most likely going to use the Sun Tie. One of them has 2 roof sections that might each hold about 3kW or possably more. I am thinking of reccomending 2880W each.

Ron


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 Post subject: Nice efficiency, fun with fishbowl
PostPosted: Wed May 28, 2003 1:09 pm GMT EthGMT 
Ron,

I'm power limiting with my 3600 watt array under clear sky conditions when the weather is cool or the wind is blowing, i.e. my MPPT is up at say, 62 volts or more around noon, otherwise max. output ranges from say, 2425 to less than 2500 watts. The truth is that I am not altogether happy with the current produced by my array. See earlier post, it is basically this, the array's rated MPPT current is 53 amperes, I have never seen greater than 46.5 amperes under non-limiting, clear sky conditions. Henry doesn't think my array is under performing, but I do. Among my concerns is Siemen's method of spec. power on the SP75 -- actually rated at 70 watts or more, with no info on typical rating. At times I think I've a bunch of defacto SP70s with 2 years of exposure to the sun. I think that this array should produce better than 50 ampers at times in clear sky conditions.
Gordon


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 Post subject: Nice efficiency, fun with fishbowl
PostPosted: Thu May 29, 2003 3:23 am GMT EthGMT 
Offline
Catfish
Catfish

Joined: Sun Sep 22, 2002 1:01 am GMT EndGMT
Posts: 42
Location: Sunnyvale, California
My 2880 array (24 KC-120s) has power limited at 2508 watts. Happened last month with cloud effects on a rather cool day. Today's max was 1668 watts (I don't know what the panel temperature was, but it's 80 degrees in my living room at midnight).

So my guess is that 2880 is about right. It will rarely limit during cloud effects, and generally run in the 1600 to 2000 max watt range. Maybe it all depends upon your local temperatures. If you're running an air conditioner in a smog pit on a 100 degree day with time of use metering, then maybe you really need those hot afternoon watts.

Just to add another wrinkle, TOU metering that runs noon to 6 would seem to favor southwest facing panels. No use collecting cheap photons in the morning when there are more lucrative ones in the afternoon...

[ May 29, 2003: Message edited by: Rob Larson ]


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