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How many panels ? ( to run 230 volt sprinkler pump 30 minutes a day?) - Page 23

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Posted by Ron Rosenfeld on July 21, 2008, 7:40 pm
On Mon, 21 Jul 2008 05:56:43 -0700 (PDT), bealiba@gmail.com wrote:

Notice how George continues to try to cover up his lack of knowledge, and
ongoing trolling for suckers, with insults.

The only fanciful claims made in this thread have been by George!

    A battery that has the same capacity at its 100 hr rate as it does
at its 30 minute rate.

    A panel rated at 14 volts to be used in a nominal 12 volt system.

    An inability to come up with any manufactured items that meet his
fanciful specifications -- but he says that is the responsibility of the
user (even though George claims to be an expert consultant).

Nick Pine had it correct years ago when he wrote about you:  "Who would
hire this nitwit?"

Posted by bealiba on July 21, 2008, 11:12 pm

Nick Pine, like Tweedledee and Tweedledum has never designed and built
a PV system.

What are the system losses?




These losses are all covered within the sizing formula, in the correct

Line losses are not part of the equation because those losses are a
result of resistance and the only ways to reduce them is to increase
the voltage or increasing the wire size. Increasing the load only
increases the losses.

End of story.

Posted by Ron Rosenfeld on July 21, 2008, 11:59 pm
 On Mon, 21 Jul 2008 16:12:09 -0700 (PDT), bealiba@gmail.com wrote:

And, with George's useless spreadsheet, given the same data, you can come
up with most any kind of system:

GG: (1st try) 154 panels

GG: (2nd try)  17- 50W Panels

GG: (3rd try)  (C5 / C12) = 10.3

You can also tell us who makes a battery that meets *your* specifications

B2     Maximum allowable depth of discharge = 70%
B13     Capacity of battery bank at 100 hr rate (B12 x B10) = 180
C4     Battery efficiency = 90%

and will also work in the proposed application.  So far you haven't even
come close.

Posted by bealiba on July 22, 2008, 2:36 am
Again. The 180Ah is the minimum battery capacity required. NOT a
battery recommendation.

The formula requires the user to input data for chosen equipment. YOU
chose T105s for the battery but were unable to supply the rest of the
required information.

I never recommended a battery.

Posted by Ron Rosenfeld on July 22, 2008, 10:55 am
 On Mon, 21 Jul 2008 19:36:54 -0700 (PDT), bealiba@gmail.com wrote:

No, I asked you if the T105, which has more than a 180Ah capacity at 100
hrs, would work in your system.  As usual, you waffled.

Good thing for the OP and anyone else reading.

That's because one does not exist that meets the specifications *YOU* put
into *YOUR* sizing formula spreadsheet and would work for the OP's system
(180Ah at the 100 hr rate).

You also didn't recommend a particular panel, again for the same reason:
*YOU* could not find a panel that would meet the specifications *YOU* put
into *YOUR* sizing formula spreadsheet that could work in the OP's system
(I at 14V at NOCT 2.94A).

What you did show was your lack of knowledge about how batteries work, and
how solar panels are rated; as well as what is required for a working

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