Hybrid Car – More Fun with Less Gas

How many panels ? ( to run 230 volt sprinkler pump 30 minutes a day?) - Page 52

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Posted by jp838 on July 3, 2008, 12:36 pm
 
wrote:

The guy who opened the thread never replied to anyone :)
It's just about wanabe scientists oversized egos!

BTW, watering - as air-conditioning, water desalination, ... - is a
very good job for solar energy: the less the sun shine, the less you
have to water; coupled with a windmill, it would be perfect - wind can
dries - so here too, the less wind the less you have to water.

Sholl





Posted by bealiba on July 3, 2008, 1:05 pm
 
wrote:

It looks like this:

A2      Daily load = 1250Wh
A4      Inverter Efficiency = 85%
A5      Account for inverter inefficiency - Load (A2/A4) = 1470.5
A7      System Voltage = 12
A8      Total A-hr demand per day (A5 / A7) = 122.55

B1      Number of days of autonomy = 1
B2      Maximum allowable depth of discharge = 70%
B3      Battery capacity (A8 x B1 / B2) = 175Ah
B4      Lowest 24 hour average temperature =15c
B5      Temperature correction factor =.97
B6      Adjusted battery capacity (B3 / B5) = 180.5
B7      Selected Battery
B8      Selected battery discharge rate 100
B9      A-hr capacity of selected battery = 180Ah
B10     Number of batteries in parallel (B6 / B9, rounded off) = 1
B11     Number of batteries in series (A7 / battery voltage) =1
B12     Check Capacity of selected battery at l00 Hr rate = 180
B13     Capacity of battery bank at 100 hr rate (B12 x B10) = 180
B14     Daily depth of discharge (100 x A8 / B13) = 68%

C1      Design tilt
C2      Design month
C3      Total energy demand per day (A8) =122.55Ah
C4      Battery efficiency = 90%
C5      Array output required per day (C3 / C4) = 136.2
C6      Peak sun hours at design tilt for design month = 5
C7      Selected module
C8      Selected module I at 14 volts at NOCT 2.94A
C9      Selected module nominal operating voltage. = 12V
C10     Guaranteed current (C8 x 0.9) = 2.65A
C11     Number of modules in series (A7 / C9) = 1
C12     Output per module (C10 x C6) = 13.2Ah
C13     Number of parallel strings of modules (C5 / C12) = 10.3

With batteries and a silly 20% added to daily load at A8 for system
losses. And while Ron whines about it, have a look at his post because
this is where he added the 20%, right after accounting for the
inverter inefficiency.

A2      Daily load = 1250Wh
A4      Inverter Efficiency = 85%
A5      Account for inverter inefficiency - Load (A2/A4) = 1470.59
A7      System Voltage = 12
A8      Total A-hr demand per day (A5 / A7) = 144.17 (rons 20% added)

B1      Number of days of autonomy = 1
B2      Maximum allowable depth of discharge = 70%
B3      Battery capacity (A8 x B1 / B2) = 206Ah
B4      Lowest 24 hour average temperature = 15c
B5      Temperature correction factor =.97
B6      Adjusted battery capacity (B3 / B5) = 212.Ah
B7      Selected Battery
B8      Selected battery discharge rate 100
B9      A-hr capacity of selected battery = 212Ah
B10     Number of batteries in parallel (B6 / B9, rounded off) = 1
B11     Number of batteries in series (A7 / battery voltage) =1
B12     Check Capacity of selected battery at l00 Hr rate = 212
B13     Capacity of battery bank at 100 hr rate (B12 x B10) = 212
B14     Daily depth of discharge (100 x A8 / B13) = 68%

C1      Design tilt
C2      Design month
C3      Total energy demand per day (A8) =144.17Ah
C4      Battery efficiency = 90% (Ron likes 80% here. If you use 80%
the
required panels come to 13.62)
C5      Array output required per day (C3 / C4) = 160.19
C6      Peak sun hours at design tilt for design month = 5
C7      Selected module
C8      Selected module I at 14 volts at NOCT 2.94A
C9      Selected module nominal operating voltage. = 12V
C10     Guaranteed current (C8 x 0.9) = 2.65A
C11     Number of modules in series (A7 / C9) = 1
C12     Output per module (C10 x C6) = 13.23Ah
C13     Number of parallel strings of modules (C5 / C12) = 12.11

These sizings take into account the all "losses" within system sizing:

INVERTER

1) Inverter efficiency

BATTERIES

1) Maximum allowable Depth Of Discharge

2) Temperature correction

PANELS

1) Panels guaranteed current

2) Battery efficiency

Just adding 20% at any point is not good design practice. Every part
of system design depends on all the numbers in the right places.

Ron says you should take his word for it.

George says here is the formula, have fun, take nobodies word for it,
work it out for yourself.

Posted by wmbjkREMOVE on July 3, 2008, 2:11 pm
 On Thu, 3 Jul 2008 06:05:53 -0700 (PDT), bealiba@gmail.com wrote:



Ron wrote the single best post in this thread, answering the OP's
question directly and properly mentioned better solutions. If you
could learn to think and write half as well then you might not be the
butt of so many jokes.


George has said a *lot*, beginning with a display of his confusion
about the difference between watts and amps, and his resultant
ludicrous recommendation of 154 panels. Only after everybody made fun
of him did he eventually settle on 10.3 panels, almost matching Ron's
estimate... many days and dozens of posts later. If George were
selling deeezines, he'd need to post his calculations on Usenet every
time to see if they were correct, or even in the ballpark.
Fortunately, nobody with an Internet connection would be dumb enough
to hire him.

Wayne

Posted by bealiba on July 3, 2008, 11:49 pm
 On Jul 4, 12:11 am, wmbjkREM...@citlink.net wrote:

Still no numbers to support his claims. Talking the talk is not the
same as walking the walk.

wayne is a talker.

Posted by busdweller on July 23, 2008, 10:32 am
 This mite do the trick
[IMG]http://i37.tinypic.com/30k5csy.jpg [/IMG]

[IMG]http://i35.tinypic.com/r2pwrq.jpg [/IMG]

Peace along the way
Dennis the bus dweller N.Y.

wrote:


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