Posted by *Josepi* on June 30, 2010, 10:12 pm

The usage (load) is 24 hours per day but the source is only 4 hours per day

to get the 720 *Wh

*note Watt is a man's name (capitalized) and hour is not

Watts x hours (Watthours)

------------------------- = Watts

hours

I understand what you are saying, but to me if there are "x" Effective Sun

Hours, "x" should replace 24h in the above formula, giving you how much

panel

you require. Seems a little easier

*> The OP requires a total of 720 wHr per day.*

*> Insolation means the number of hours where you effectively get "full*

*> sun" per day, sometimes also abbreviated ESH (effective sun hours),*

*> and also the full rated output from your PV Panel.*

*> Since the sun is not directly overhead all day, nine hours of daytime*

*> will not generate the maximum out of the PV panels for the entire nine*

*> hours; rather (in this case) it would be as if the sun were directly*

*> overhead four hours. (The fact that this is 1/6 of a day is*

*> irrelevant; the "day" could be any length).*

*> Since the OP requires 720 wHr per day; and since there are 4 ESH per*

*> day, you divide the 720 by four to determine how much Panel you*

*> require.*

*> Let's review the formula and the definitions:*

*> ----------------------------------*

*> so for 2.5A x 12V x 24h = 720 whr per day*

*> dividing by the insolation factor of 4 = 180 Watts of PV panels.*

*> --------------------------------*

.

Posted by *Malcom \"Mal\" Reynolds* on July 1, 2010, 4:43 am

wrote:

*> *note Watt is a man's name (capitalized) and hour is not*

I always thought hour was named after the Hour family. The Minute family came in

second to them.

lol

Posted by *Josepi* on July 1, 2010, 12:25 pm

That's where Minute Maid and Minute Man came from!

LOL

I always thought hour was named after the Hour family. The Minute family

came in

second to them.

wrote:

*> *note Watt is a man's name (capitalized) and hour is not*

Posted by *Malcom \"Mal\" Reynolds* on July 1, 2010, 6:12 pm

wrote:

*> That's where Minute Maid and Minute Man came from!*

*> *

*> LOL*

*> *

*> I always thought hour was named after the Hour family. The Minute family *

*> came in*

*> second to them.*

*> *

*> *

*> wrote:*

*> *

*> > *note Watt is a man's name (capitalized) and hour is not*

Minute Man was the illegitimate child of Baron von Hour and the (minute family)

maid

Posted by *Josepi* on July 1, 2010, 9:07 pm

Did you mean "hourglass", figuratively speaking?

Minute Man was the illegitimate child of Baron von Hour and the (minute

family)

maid

wrote:

*> That's where Minute Maid and Minute Man came from!*

*> LOL*

*> I always thought hour was named after the Hour family. The Minute family*

*> came in*

*> second to them.*

*> wrote:*

*> > *note Watt is a man's name (capitalized) and hour is not*

> The OP requires a total of 720 wHr per day.> Insolation means the number of hours where you effectively get "full> sun" per day, sometimes also abbreviated ESH (effective sun hours),> and also the full rated output from your PV Panel.> Since the sun is not directly overhead all day, nine hours of daytime> will not generate the maximum out of the PV panels for the entire nine> hours; rather (in this case) it would be as if the sun were directly> overhead four hours. (The fact that this is 1/6 of a day is> irrelevant; the "day" could be any length).> Since the OP requires 720 wHr per day; and since there are 4 ESH per> day, you divide the 720 by four to determine how much Panel you> require.> Let's review the formula and the definitions:> ----------------------------------> so for 2.5A x 12V x 24h = 720 whr per day> dividing by the insolation factor of 4 = 180 Watts of PV panels.> --------------------------------.