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How many panels ? ( to run 230 volt sprinkler pump 30 minutes a day?) - Page 11

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Posted by Ron Rosenfeld on July 16, 2008, 12:06 pm
On Wed, 16 Jul 2008 00:58:19 -0700 (PDT), bealiba@gmail.com wrote:

OK, I can use an 11 panel system in the simulation.

Now then, what size panel are you recommending?

You wrote previously:

Since the STC standard doesn't have a voltage specification of 14 Volts,
you still haven't explained what test standard you are referring to.

I suppose since you are specifying a panel that has an open circuit voltage
of 17 volts, it probably would put out only 14 volts under load.

Not in your system.  I wondered if you would use that.  I guess not.

I'd be happy to use any battery you want that meets your specifications  in
the simulation.  Same with the panel.

The only thing I've recommended were 10 panels of the type the OP said he
wanted to use; and also that he would need some sort of energy storage.

You've made multiple recommendations for imaginary equipment, and refused
to provide any examples of real world items that would even come close to
matching your specifications.  

I've made a few suggestions as to equipment that might work, but you've
rejected them so far; and I've also asked for clarification of your
specifications, so as to make them useable, and you've been unable to even
do that.

So, George -- any real world panels & batteries that come close to matching
your specifications, and will work with your system design to allow the
OP's 2500W pump to work for 1/2 hr daily?

Here are George's partial specs for panels:

C8      Selected module I at 14 volts at NOCT 2.94A
 17 volts is what the panel produces when not connected to a load.
I said 11 panels. 10.3 rounded up

Here are George's partial specs for a battery bank:

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

Here are George's examples of equipment that might meet those




Posted by bealiba on July 16, 2008, 12:44 pm

I have not recommended any particular panel, The op gave the
information.  Try BP, they make a range of panels indifferent

Mind like a steel trap*

I, personally, would never use T105s except in a golf cart.

There is a whole world of batteries and panels to choose from.

I have not made any recommendation as to equipment, imaginary or

You suggested T105s. I have not rejected anything. I'm waiting for you
to propose your system.


They make some quite nice batteries

Based on OPs question. I did not recommend any particular panel.

Now if this is correct then all the other statements you have made
about equipment you have said I have recommended are lies.

Posted by Ron Rosenfeld on July 16, 2008, 4:42 pm
 On Wed, 16 Jul 2008 05:44:06 -0700 (PDT), bealiba@gmail.com wrote:

I, I see.  Now your blathering about numbers of panels with certain
characteristics, and a battery bank with certain specifications, were not
recommendations for imaginary equipment either.  Clearly they were not
recommendations for real equipment, since nothing exists with those

Obviously you cannot read.  

I've claimed that you have been UNABLE to recommend any specific equipment
and asked you repeatedly for specific recommendations.  I've made a few
suggestions of stuff that might meet YOUR specifications, but so far as I
can tell, you've never recommended anything usable.  Even your so-called
specifications are useless.

Posted by bealiba on July 17, 2008, 12:19 am
I have not suggested any equipment at all. The only equipment
suggested was suggested by you, namely T105 batteries

I have not recommended any specific equipment. I provided the correct
formula, the formula requires user input.

No. you made one recommendation. This was for T105 batteries

I have not recommended any specific equipment at all. Usable or

The only specification is the minimum battery capacity, it is

Posted by Duane C. Johnson on July 13, 2008, 11:25 pm
 bealiba@gmail.com wrote:

 > 14 volts is the test standard at 25C.

14V is not the test standard at 25C.

Most manufacturers test panels to the ASTM standard
which is at the Maximum Power Point which is usually
around 17 to 18 volts or so and 25C.

 > 17 volts is what they produce when not connected
 > to a load.

Open circuit voltage of most 12V silicon panels,
with 36 cells, is about 21V. Others may be higher.

 > Surprised you don't know this.

Surprised you don't know this.


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