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POPSCAN

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Reply with quote  #1 
I just purchased a 100 watt flexible solar panel and plan to place it inside my bedroom window which faces due north.  Does anyone have thoughts about using a huge mirror to reflect morning/evening light directly onto the panel??  Instead of hookup wire running through my house walls and panel on outside.   I  even thought about using a huge silver {inside lined} umbrella to reflect light.  Both can be taken down quickly in a storm situation.

Has anyone tried this??

SolarInterested

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Reply with quote  #2 
Welcome to the forum. This has been done before and there are even mirrors which will track the sun during the day.
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Both temperature rise and airflow are integral to comparing hot air collectors
SolarInterested

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Reply with quote  #3 
You can use the 'Search' feature of this forum to look for 'Reflector' and BuildItSolar (our sister site) has lots of other links related to reflectors.

http://www.builditsolar.com/Experimental/Reflectors/Main.htm

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Both temperature rise and airflow are integral to comparing hot air collectors
Rick H Parker

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Reply with quote  #4 
Mirrors cost more per sq ft then solar panels. If you don't have the mirror, you would be better off buying a second panel instead of a mirror. If you do have a mirror, selling the mirror and rolling the money into a second panel might be a better deal.
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Rick H Parker
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stmbtwle

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Reply with quote  #5 
PV panels can be really picky.  If your reflector only illuminates half the panel, you won't get half the power, it'll be closer to zero.  So you'll need to track the sun with your reflector, or it'll have to be a REALLY BIG reflector.  

Better would be to locate the panel outside where you'd put the mirror, if you can.

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Gordy

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Reply with quote  #6 
Popscan,

Welcome aboard.

http://www.redrok.com  This site should be interesting if not overwhelming ;-) it is huge. I remember seeing plans for a heliostat there, set of mirrors that track the sun and direct it to a fixed point. Like those big ones out in the desert. Care must be taken not to over heat the collector or the side of the house if you use multiple mirrors aimed to the same point / target.



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Gordy,
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gbwillson

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Reply with quote  #7 
Welcome Popscan!

A mirror will cost you roughly $1/sf. If you want to experiment using reflectors at a fraction of the cost of an actual mirror, try using reflective mylar. It costs roughly 1/10th of the cost of a mirror. You can buy it in rolls or sheets on Amazon. Mylar reflective emergency blankets work too, but they tend to be so thin you can see through them. But they DO work! 

Greg in MN[wave]
Gordy

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Reply with quote  #8 
I picked up cheap mirrors at garage and auction sales ;-) But they need to be sealed on the backs and sides, or moisture will eventually get in between the glass and the reflective coating when used outside.
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Gordy,
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alberto

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Reply with quote  #9 
It may work. But you should think about the price. And as you said, it can be taken down quickly in a storm situation.
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Solar panels, wind turbines, solar vehicle...may help
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