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Search took 0.00 seconds. Search: Posts Made By: s/v Jedi
Forum: Electrical: Batteries, Generators & Solar 08-03-2014, 05:32
Replies: 180
Views: 60,697
Posted By s/v Jedi
Re: Solar Panels - Series or Parallel ?

2 regulators? I just change the settings, takes all of 30 seconds.
(this is with an Outback controller).
Forum: Electrical: Batteries, Generators & Solar 07-03-2014, 19:28
Replies: 180
Views: 60,697
Posted By s/v Jedi
Re: Solar Panels - Series or Parallel ?

I set my absorption and float voltages to 13.2V when I'm not aboard.
Forum: Electrical: Batteries, Generators & Solar 07-02-2014, 18:54
Replies: 180
Views: 60,697
Posted By s/v Jedi
Re: Solar Panels - Series or Parallel ?

Well, when SHTF, you can always directly connect panels to batteries. I would much prefer one Outback Flex controller over two BlueSky controllers. Sure, two flex controllers is nice but makes sense...
Forum: Electrical: Batteries, Generators & Solar 07-02-2014, 18:49
Replies: 180
Views: 60,697
Posted By s/v Jedi
Re: Solar Panels - Series or Parallel ?

okay, so that can be improved to 13W with an extra diode on each panel. The 0.8V is too high, should be 0.6V (because that is the actual voltage drop). At 8A in an optimized circuit we get 1.2V * 8A...
Forum: Electrical: Batteries, Generators & Solar 07-02-2014, 12:00
Replies: 180
Views: 60,697
Posted By s/v Jedi
Re: Solar Panels - Series or Parallel ?

I am sorry, but as an EE you know that two diodes in series would start conducting on the output of the unshaded panel. Adding a diode over the whole panel will make it better, but only a little bit....
Forum: Electrical: Batteries, Generators & Solar 07-02-2014, 11:45
Replies: 180
Views: 60,697
Posted By s/v Jedi
Re: Solar Panels - Series or Parallel ?

While I find 56W loss way too much for two diodes (they would flash bang the boat to pieces), it is true that series-parallel would perform a little better. Did you add a bypass diode for each panel...
Forum: Electrical: Batteries, Generators & Solar 07-02-2014, 05:06
Replies: 180
Views: 60,697
Posted By s/v Jedi
Re: Solar Panels - Series or Parallel ?

Indeed. His tests were flawed because the bypass diode(s) is(were) blown or missing, or installed backwards. Adding an additional diode over the whole panel is only to optimize things in case a whole...
Forum: Electrical: Batteries, Generators & Solar 06-02-2014, 17:51
Replies: 180
Views: 60,697
Posted By s/v Jedi
Re: Solar Panels - Series or Parallel ?

It sounds like the difference Mark saw was substantial. With four panels in series and two shaded, there are two diodes in the circuit that take some voltage off. This loss is prevented when you put...
Forum: Electrical: Batteries, Generators & Solar 15-02-2012, 13:11
Replies: 180
Views: 60,697
Posted By s/v Jedi
Re: Solar Panels - Series or Parallel ?

Well, we all know where that 5% is hiding then :D

But you must be wrong because I have lost all perspective of reality with my claims that series connection works more efficient than parallel...
Forum: Electrical: Batteries, Generators & Solar 14-02-2012, 14:45
Replies: 180
Views: 60,697
Posted By s/v Jedi
Re: Solar Panels - Series or Parallel ?

You did great Chuck and your data is correct, as was that from others who put in the effort to study and test this and report it here. It's a shame that people believe we are trying to sell snake...
Forum: Electrical: Batteries, Generators & Solar 14-02-2012, 05:13
Replies: 180
Views: 60,697
Posted By s/v Jedi
Ignore the naysayers, the manufacturer of your...

Ignore the naysayers, the manufacturer of your panel knows exactly what they did by wiring the sections in series. Do not modify it and wire the 54V output to your MPPT controller that is rated for...
Forum: Electrical: Batteries, Generators & Solar 14-02-2012, 05:07
Replies: 180
Views: 60,697
Posted By s/v Jedi
Cotemar, you are the one distorting reality. Open...

Cotemar, you are the one distorting reality. Open your mind to scientific method, read what has been written about tests by others than me in this thread, and you will find that you are wrong and...
Forum: Electrical: Batteries, Generators & Solar 14-02-2012, 04:58
Replies: 180
Views: 60,697
Posted By s/v Jedi
It is completely the other way around. Read the...

It is completely the other way around. Read the tests done earlier in the thread. When you shade half a panel in your setup, output drops to 50%, ie you lose the whole panel. In series, you only lose...
Forum: Electrical: Batteries, Generators & Solar 14-02-2012, 04:23
Replies: 180
Views: 60,697
Posted By s/v Jedi
Exactly. When panels are very close together, you...

Exactly. When panels are very close together, you can also wire them efficiently in parallel just like batteries, but then it requires a bigger diameter cable to connect that parallel array to the...
Forum: Electrical: Batteries, Generators & Solar 13-02-2012, 18:40
Replies: 180
Views: 60,697
Posted By s/v Jedi
Ehmmmm..... We didn't calculate anything...

Ehmmmm.....

We didn't calculate anything about loss in cabling for parallel vs series for different locations of the panels. The wire gauge is completely dependent on the length of the cabling and...
Forum: Electrical: Batteries, Generators & Solar 13-02-2012, 18:16
Replies: 180
Views: 60,697
Posted By s/v Jedi
That is the beauty of series connection: the...

That is the beauty of series connection: the current stays the same so diodes are always good. The diodes don't care about voltage other than the 0.67V that they keep for themselves when conducting....
Forum: Electrical: Batteries, Generators & Solar 13-02-2012, 12:56
Replies: 180
Views: 60,697
Posted By s/v Jedi
Frank, If you share info, you should be open...

Frank,

If you share info, you should be open to some debate on it... this ain't grafiti :)

About the research: it is based on panels as they were sold decades ago. I do not believe that any...
Forum: Electrical: Batteries, Generators & Solar 13-02-2012, 12:02
Replies: 180
Views: 60,697
Posted By s/v Jedi
Okay: - you need a controller (MPPT) that...

Okay:

- you need a controller (MPPT) that can handle the input voltage of the series connection.

- the blocking diode is something different than the bypass diodes. If the dealer mixes that up...
Forum: Electrical: Batteries, Generators & Solar 13-02-2012, 10:36
Replies: 180
Views: 60,697
Posted By s/v Jedi
Re: Solar Panels - Series or Parallel ?

Exactly this is the reason that the myth of parallel vs series connection stays alive... there is tests and research out there that must be from decades ago because that is how long all the panels...
Forum: Electrical: Batteries, Generators & Solar 12-02-2012, 09:06
Replies: 180
Views: 60,697
Posted By s/v Jedi
Re: Solar Panels - Series or Parallel ?

The only remarkable thing about it is that testing was actually needed to get to this point (theory is solid, no magic involved), but now that Pete got that done, we can point all the naysayers to...
Forum: Electrical: Batteries, Generators & Solar 11-02-2012, 11:48
Replies: 180
Views: 60,697
Posted By s/v Jedi
Re: Solar Panels - Series or Parallel ?

Anybody actually wiring in series will find that Noelex is absolutely correct: series is better when your panels have bypass diodes. I have never seen a panel on a boat that didn't have them; my 8...
Showing results 1 to 21 of 21

 
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