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Re: Aliexpress - Amazing service!

 by Neddy ¦  Sun Apr 22, 2018 7:30 pm ¦  Forum: General Discussions ¦  Topic: Aliexpress - Amazing service! ¦  Replies: 5 ¦  Views: 196

They seem to be delivering the goods faster as well. Most things are now on my door-step (rural delivery) in just 6 days. The norm here used to be 2 weeks or more.

Re: Solar Panel Wiring Diagrams.

 by Neddy ¦  Sun Apr 22, 2018 7:19 pm ¦  Forum: Solar ¦  Topic: Solar Panel Wiring Diagrams. ¦  Replies: 117 ¦  Views: 5048

The bigger the voltage difference between the panels, the higher the reverse current.
The more one panel is shaded, the lower its voltage and thus the greater the voltage difference and the greater the reverse current flow between the panels.

Re: Solar Panel Wiring Diagrams.

 by Neddy ¦  Sun Apr 22, 2018 3:37 pm ¦  Forum: Solar ¦  Topic: Solar Panel Wiring Diagrams. ¦  Replies: 117 ¦  Views: 5048

My panels are poly 250W 60 cell panels So they have open-circuit voltages of about 37.4 volts? " I was getting about 80mA night-time current. If one jumped to the conclusion that there were blocking diodes already in these panels one just might be wrong." Indeed! "So, two panels in full sunlight an...

Re: Solar Panel Wiring Diagrams.

 by Neddy ¦  Sat Apr 21, 2018 10:44 am ¦  Forum: Solar ¦  Topic: Solar Panel Wiring Diagrams. ¦  Replies: 117 ¦  Views: 5048

The four are identical MPPT controllers, but I have found that this is not at all critical and even PWM controllers can be added to the mix with impunity.

Re: Solar Panel Wiring Diagrams.

 by Neddy ¦  Sat Apr 21, 2018 6:54 am ¦  Forum: Solar ¦  Topic: Solar Panel Wiring Diagrams. ¦  Replies: 117 ¦  Views: 5048

I cannot understand why this simple topic has generated so much controversy. If the manufacturer of your solar panels states that the use of Blocking diodes is "essential" when wiring their panels in parallel, you would be an idiot not to do so. If you can prove that bad things happen when you paral...

Re: Solar Panel Wiring Diagrams.

 by Neddy ¦  Fri Apr 20, 2018 12:59 pm ¦  Forum: Solar ¦  Topic: Solar Panel Wiring Diagrams. ¦  Replies: 117 ¦  Views: 5048

I know what Bypass diodes are, Myles. This discussion is about Blocking diodes, however. Always has been. I simply reported what happened when I wired two bog-standard RV solar panels in Parallel without Blocking diodes.... and then with them (as mandated by the panel manufacturer). I thought the re...

Re: Solar Panel Wiring Diagrams.

 by Neddy ¦  Fri Apr 20, 2018 9:31 am ¦  Forum: Solar ¦  Topic: Solar Panel Wiring Diagrams. ¦  Replies: 117 ¦  Views: 5048

Myles, put personal opinions aside and let the facts speak for themselves. Parallel two 12v batteries and little or no current will flow between them. Parallel a 12v battery and a 6v battery and a heavy current will flow from the 12v battery into the 6v battery. Result :- A flattened 12v battery, a ...

Re: Solar Panel Wiring Diagrams.

 by Neddy ¦  Thu Apr 19, 2018 2:32 pm ¦  Forum: Solar ¦  Topic: Solar Panel Wiring Diagrams. ¦  Replies: 117 ¦  Views: 5048

I hate to break this to you Myles, but that dude most certainly is not "very much in the know about all things solar". He seems to be unaware that blocking diodes are not there to save power, but rather to save damage being sustained by shaded solar cells. Quite obviously he has never connected two ...

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