โApr-27-2013 06:23 AM
โApr-30-2013 11:15 AM
โApr-30-2013 10:17 AM
โApr-30-2013 08:06 AM
smkettner wrote:
I don't see how partial shade could be worse as any excess should pass forward and any minimal production will allow some power to go through the cells.
http://www.ti.com/lit/ds/symlink/sm74611.pdf
Still more reading to do.
โApr-30-2013 05:05 AM
smkettner wrote:
Forward drop of a Schottky is about 0.4v and you push through three in full shade for a total of less than 2 volts lost. So my 2 panels still in the sun producing 7.5a and 60v will only put 7.5a and 58v to the controller. This is a loss of 4% in addition to the third panel not producing. That is the theory to test anyway. I don't see how partial shade could be worse as any excess should pass forward and any minimal production will allow some power to go through the cells.
http://www.ti.com/lit/ds/symlink/sm74611.pdf
Still more reading to do.
โApr-29-2013 08:11 PM
โApr-29-2013 06:44 PM
Sal wrote:
I'm no solar expert
โApr-29-2013 06:29 PM
โApr-29-2013 06:09 PM
Salvo wrote:
If one panel is shaded it will still output current. But the shaded panel current is significantly less than the others. The diodes in the shaded panel will not conduct (the panel is producing power). Due to the series string, the shaded panel will significantly reduce total power production.
The parallel configuration will be much better.
โApr-29-2013 05:25 PM
โApr-29-2013 05:17 PM
2oldman wrote:Salvo wrote:No, it isn't.
The series vs parallel debate is not as clear cut as some think.
Series solar testing
In my case of 6 panels in series I see no drastic power loss with one whole shaded panel. But, again, that's MY case. YMMV.
โApr-29-2013 04:55 PM
nomad 289 wrote:Yep, that's exactly how I see it.
Seems series is an easier install for typical no shade situations, while expected partial shade would favor parallel or lots-of-diodes.
โApr-29-2013 04:11 PM
โApr-29-2013 01:55 PM
nomad 289 wrote:
Thanks Sal.
The very bottom of this page documents a series vs parallel test; conducted by an Electrical engineer and his Physics DW. The results astonished me also, which is the only reason I passed it on. Good discussion of the pros and cons of series/parallel, tilt, low light, etc.
http://roadslesstraveled.us/rv-solar
I don't have solar yet so will leave it to the forum to ascertain the best installation for the $2700 panels PT is .not. buying.
One panel partly shaded:
10.0 amps parallel.
1.6 amp series.
They went parallel for their 3rd system. Sailboat solar
โApr-29-2013 01:39 PM
Salvo wrote:No, it isn't.
The series vs parallel debate is not as clear cut as some think.