nvreloader
Western Nevada
Senior Member
Joined: 12/08/2006
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Question,
If, I have to change to a couple of smaller sized panels, how close does the voltages have to be, meaning, identical Voc and Vmp?
Tia,
Don
2010 F-350,6.4PSD, 6spd man trans,CC,SWB,SRW, Caravan camper shell,50 gal bed tank,17,000lb Husky WD hitch,2008 28KS Desert Fox TH,2005 Honda 500 Rubicon ATV w/rumble seat,2 Aussie's waiting,watching and ridin shotgun on the whole outfit.
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camperpaul
Wherever I park my travel trailer
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Joined: 05/10/2006
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nvreloader wrote:camperpaul wrote:Canadian Rainbirds wrote:. . . . .
BTW: Here is my first "solar project" - placed into operation in 1974 and still partially operational...
Cool! OSCAR 7 ?
VA7RV
Yup...
The "professionals" said it would last for about three years...
It abruptly quit working when it was seven years old, the apparent victim of a meteor hit to both battery packs.
After 21 years of the solar panels trying to charge the shorted batteries, somewhere a fuse blew, taking the batteries off line and allowing the solar panels to power the bird when it is in sunlight.
K9ERG
CamperPaul,
How many worts of power on that beast?
Tia,
Don
The VHF to HF repeater is 2 Watts PEP output, divided between the users.
The UHF to VHF repeater is 8 Watts PEP output, divided between the users.
The solar panels are about 18% efficient but only produce about 50 Watts (24 Volts @ 2 Amps) because of their small size...
The bird is 360 mm (14 in.) high and 424 mm (16.6 in.) in diameter and only 3 of the solar panels receive enough sunlight to be effective at the same time. Whenever the bird is in sunlight, there are always 3 panels in the sun.
When we transported it from the lab to the launch site it was packed in the tub from a Maytag 20 lb. washing machine.
----------------------------
We return now to "Sun angles..."
Paul
Ham Radio - K9ERG (since 1956)
Was a campground host at IBSP (2006-2010) - now retired.
Single - Full-timer
2005 Four Winds 29Q
1982 6.2L Diesel Suburban 1500
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MrWizard
Van Nuys, Ca
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Joined: 06/27/2004
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nvreloader wrote:Question,
If, I have to change to a couple of smaller sized panels, how close does the voltages have to be, meaning, identical Voc and Vmp?
Tia,
Don
try to stay within 1 volt of vmp
Options, always have options, and the journey goes much smoother
....
Connected thru Verizon with HotSopt WiFi using a Samsung Galaxy Nexus
Member of the Verizon Wireless Customer Council
I BOUGHTthis phone
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bill h
coastal reconquista
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Joined: 08/02/2001
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This SITE will give you the optimum angle for tilt.
However, if you run through a bunch of tilt angles, you will see that being 10 degrees from optimum loses only 1.3%, so accuracy is not terribly rewarding.
NOTE: Any incorrect spelling is intentional to prevent those annoying popups.
84 Barth 30Tag powered by HT502/Thorley/Weiand etc, Gear Vendors OD.
Siamese Calvin and Airedale Hobbes, 4WD Toyota toad
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BFL13
Victoria, BC
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Joined: 02/15/2006
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I get way more change in amps in real life per 10 degrees change in tilt than that 1.3% . Did you mean 10.3% ? My peak amps is 8.2a but it can drop to 7a or less if I am not right on.
2003 Chev 2500HD ExtCab, LB, 2WD, 6.0/4.10 Gas
2003 Komfort 26FS 5er (28.5 Ft-RK-10,000lb GVWR)
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nvreloader
Western Nevada
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Joined: 12/08/2006
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Guys thank for the info,
During the testing of my scale roof model, I think I can adjust the #3 panel locations (forward/backwards) for winter time use and not have or very little shadow from the AC or the #3 panel shadowing the #2 panel.
Tia,
DonH
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bill h
coastal reconquista
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Joined: 08/02/2001
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BFL13 wrote:I get way more change in amps in real life per 10 degrees change in tilt than that 1.3% . Did you mean 10.3% ? My peak amps is 8.2a but it can drop to 7a or less if I am not right on.
I was just using their figures. I don't get up on the roof much lately. It would be a good idea to do that with a clamp ammeter up there with me, though.
And, yes, I may have lost the decimal point. Slide rules do that. 
It's a good point, and I will recheck later.
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