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Old 10-29-2018, 10:30 AM   #29
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Vince and Susan

You can use mismatched voltage panels but it probably requires two different controllers.

Our son designed and fabricated our Roadtrek with one 315 W and one 100 W panel due to real estate limit on Roadtrek Roof. This requires two controllers and a 12 V nominal LFP (4.5 kW-hr)

Reed and Elaine
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Old 10-29-2018, 11:31 AM   #30
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Reed is correct. We can use mismatch panels in the following conditions -

(1) For series connection, as only as the panels have the same amp rating, regardless their voltages;

(2) For parallel connection, as only as the panels have the same voltage, regardless their amps.
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Old 10-30-2018, 02:00 AM   #31
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Quote:
Originally Posted by Reed Cundiff View Post
Vince and Susan

You can use mismatched voltage panels but it probably requires two different controllers.

Our son designed and fabricated our Roadtrek with one 315 W and one 100 W panel due to real estate limit on Roadtrek Roof. This requires two controllers and a 12 V nominal LFP (4.5 kW-hr)

Reed and Elaine
The portable setup is used only when the rooftop panels are blocked.
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Old 11-03-2018, 03:32 PM   #32
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Finally found the prewired wires in the ceiling of the bay with the inverter in it...plenty large enough for the 80V down to the mppt controller. Will run 2’ long 4-0 cables from it to the inverter cables...about the last thing to do. Will be after Christmas before the rig will be out in the sun.
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Old 11-08-2018, 01:34 AM   #33
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I'm not sure how you plan to test the panel aerodynamics ... or how it's even possible. Worst case is maybe 70 mph rig speed and 50 mph cross winds for a total of 86 mph. Not 86 mph forward speed, but at an angle of about 35 or 40 degrees. The lift the panels generate in a cross wind will be hugely different from a head-on wind, especially so since the panels are tilted.

Then there's driving into a headwind, maybe downhill so you can sustain your speed (unless you have a DP then you probably don't need to be going down hill). Maybe 70 mph for the coach and 30 mph for the headwind. 100 mph total.

And then there are gusts. I could envision well over 100 mph (total of wind and rig) with gusts head-on and over 100 for the cross-wind case.

I've experienced all of the above. I believe my 5er even got up on two wheels once in Wyoming. Very scary. It was sitting at about 10+ degrees to horizontal and we took a gust from the upwind side. I could not watch the 5er, too busy trying to stay on the road. I just know that things got pretty until things settled down. And I have a 6700# truck towing an 8400# 5er. That's a rather large truck to 5er ratio but hasn't kept me from some scary times.

I was going down a mountain once at about 70 and ran into a strong bumpy headwind. My truck is only a gasser so I could not hold 70 into that headwind even going downhill. I did check my panels after that. They were fine but they have sturdy frames and three brackets down each side. And only an inch between the frames and the roof.

Also keep in mind that if you do lose a panel or two, you could hurt somebody and be on the wrong end of a nasty lawsuit.

Please give this a bit more thought.

Edit PS: I don't think comparing a spare tire and a flat pane tells you anything useful even if you did see over 100 mph on that spare tire.
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Old Today, 05:11 AM   #34
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I already knew the aerodynamic of a brick but here is a good wind tunnel test of a bus. Little or no wind at the roof on the front half of the bus. The turbulence at the back concerns me some although my roof is unusual with raised areas at the front and back so not sure if there will be any turbulence at the sunken roof level at the back. I will run a cord that will limit how much a panel can raise up although my bet is the paper test strips will still be under the supports...no uplifting.

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