Posted by *wmbjkREMOVE* on July 30, 2008, 6:04 pm

On Wed, 30 Jul 2008 01:08:42 -0700 (PDT), bealiba@gmail.com wrote:

*>INVERTER SIZE 882.35 WATTS*

Bzzt

*>SELECTED BATTERY DISCHARGE RATE 1.00 HOURS*

*>Ah CAPACITY OF SELECTED BATTERY 238.00 A HOURS*

Bzzt

*>CAPACITY OF BATT. BANK @ 1 HR RATE 238.00 A HOURS*

Bzzt

*>DAILY DEPTH OF DISCHARGE 51.49 %*

Bzzt

*>It is correct.*

Bzzt bzzt bzzt bzzt buzzt

*> Mind you I would never build*

*>this system.*

More correctly, nobody with any common sense, and especially anyone

with an Internet connection they could use to view your previous

"sizing" debacles, would hire you to build this or any other system.

*>It is a dead end.*

At least you're finally getting closer. Which would be a good thing if

you were an earnest, dim-witted student. The trouble is, you're

pretending to be an expert, and insisting that this and all the

previous efforts were "correct", even though you've spent *weeks*

trying to fix errors that needed pointing out by others, and are

*still* pounding out worse mistakes than the greenest newb, such as 4

2V cells in parallel.

*>The formula is there.*

It wouldn't be if there was a moderator. But just because you *can*

write advertisements of your shortcomings, doesn't mean that it's a

good idea to do so. Particularly since by now even you should realize

that an ill-advised reliance on "the formula" is a large part of your

GIGO problem.

*>Care to try just once.*

Why would anyone want to try it given that even the author can't make

it work?

Wayne

Posted by *Ron Rosenfeld* on July 30, 2008, 3:24 am

On Tue, 29 Jul 2008 17:44:28 -0700 (PDT), bealiba@gmail.com wrote:

*>This formula will correctly size a stand alone PV system given the*

*>user input is correct. You can see every calculation. No great*

*>secrets. No mysteries.*

As seen in my previous post, not only are the formulas as documented in the

spreadsheet inaccurate, but also inaccurate are the user inputs.

But, to repeat:

*>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 c*

*>B5 Temperature correction factor =.97*

*>B6 Adjusted battery capacity (B3 / B5) = 180*

*>B7 Selected Battery 2AS620*

*>B8 Selected battery discharge rate 1*

*>B9 A-hr capacity of selected battery = 238Ah*

*>B10 Number of batteries in parallel (B6 / B9, rounded off) = 4*

*>B11 Number of batteries in series (A7 / battery voltage) =1*

*>B12 Check Capacity of selected battery at 1 Hr rate = 238*

*>B13 Capacity of battery bank at 1 hr rate (B12 x B10) = 238*

*>B14 Daily depth of discharge (100 x A8 / B13) = 51.49%*

Note the calculation in B10:

B10: B6/B9, rounded off = 4

But B6 = 180

B9 = 238

I guess George thinks 180/238 = 4. But it is 0.756.

Also note the calculation in B11

B11: A7 / Battery voltage = 1

A7 = 12

voltage of 2AS620 = 2V according to the mfg.

I guess George thinks 12/2 = 1. But it is 6

*>You do however have to provide correct data at several points. If*

*>you, like Tweedledee and Tweedledum, are unable to do so then you*

*>would be better off to hire someone to do it for you as Tweedledee*

*>did, or, you can follow Tweedledum's solution and copy someone else's*

*>system design and throw money at it until it works, at least during*

*>daylight hours..*

George! I didn't know you hired someone to design a system for you, and

then had to throw money at until it started working!

I knew you had to throw money at your system to get it working after your

initial setup, but I thought you had done the initial design yourself.

--ron

Posted by *bealiba* on July 30, 2008, 8:08 am

*> On Tue, 29 Jul 2008 17:44:28 -0700 (PDT), beal...@gmail.com wrote:*

*> >This formula will correctly size a stand alone PV system given the*

*> >user input is correct. You can see every calculation. No great*

*> >secrets. No mysteries.*

*> As seen in my previous post, not only are the formulas as documented in the*

*> spreadsheet inaccurate, but also inaccurate are the user inputs.*

*> But, to repeat:*

*> >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 c*

*> >B5 Temperature correction factor =.97*

*> >B6 Adjusted battery capacity (B3 / B5) = 180*

*> >B7 Selected Battery 2AS620*

*> >B8 Selected battery discharge rate 1*

*> >B9 A-hr capacity of selected battery = 238Ah*

*> >B10 Number of batteries in parallel (B6 / B9, rounded off) = 4*

*> >B11 Number of batteries in series (A7 / battery voltage) =1*

*> >B12 Check Capacity of selected battery at 1 Hr rate = 238*

*> >B13 Capacity of battery bank at 1 hr rate (B12 x B10) = 238*

*> >B14 Daily depth of discharge (100 x A8 / B13) = 51.49%*

*> Note the calculation in B10:*

*> B10: B6/B9, rounded off = 4*

*> But B6 = 180*

*> B9 = 238*

*> I guess George thinks 180/238 = 4. But it is 0.756.*

*> Also note the calculation in B11*

*> B11: A7 / Battery voltage = 1*

*> A7 = 12*

*> voltage of 2AS620 = 2V according to the mfg.*

*> I guess George thinks 12/2 = 1. But it is 6*

*> >You do however have to provide correct data at several points. If*

*> >you, like Tweedledee and Tweedledum, are unable to do so then you*

*> >would be better off to hire someone to do it for you as Tweedledee*

*> >did, or, you can follow Tweedledum's solution and copy someone else's*

*> >system design and throw money at it until it works, at least during*

*> >daylight hours..*

*> George! I didn't know you hired someone to design a system for you, and*

*> then had to throw money at until it started working!*

*> I knew you had to throw money at your system to get it working after your*

*> initial setup, but I thought you had done the initial design yourself.*

*> --ron*

Never resorted to either.

Posted by *Ron Rosenfeld* on July 30, 2008, 10:52 am

On Wed, 30 Jul 2008 01:08:36 -0700 (PDT), bealiba@gmail.com wrote:

*>> On Tue, 29 Jul 2008 17:44:28 -0700 (PDT), beal...@gmail.com wrote:*

*>> >This formula will correctly size a stand alone PV system given the*

*>> >user input is correct. You can see every calculation. No great*

*>> >secrets. No mysteries.*

*>>*

*>> As seen in my previous post, not only are the formulas as documented in the*

*>> spreadsheet inaccurate, but also inaccurate are the user inputs.*

*>>*

*>> But, to repeat:*

*>>*

*>>*

*>>*

*>> >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 c*

*>> >B5 Temperature correction factor =.97*

*>> >B6 Adjusted battery capacity (B3 / B5) = 180*

*>> >B7 Selected Battery 2AS620*

*>> >B8 Selected battery discharge rate 1*

*>> >B9 A-hr capacity of selected battery = 238Ah*

*>> >B10 Number of batteries in parallel (B6 / B9, rounded off) = 4*

*>> >B11 Number of batteries in series (A7 / battery voltage) =1*

*>> >B12 Check Capacity of selected battery at 1 Hr rate = 238*

*>> >B13 Capacity of battery bank at 1 hr rate (B12 x B10) = 238*

*>> >B14 Daily depth of discharge (100 x A8 / B13) = 51.49%*

*>>*

*>> Note the calculation in B10:*

*>>*

*>> B10: B6/B9, rounded off = 4*

*>>*

*>> But B6 = 180*

*>> B9 = 238*

*>>*

*>> I guess George thinks 180/238 = 4. But it is 0.756.*

*>>*

*>> Also note the calculation in B11*

*>>*

*>> B11: A7 / Battery voltage = 1*

*>>*

*>> A7 = 12*

*>> voltage of 2AS620 = 2V according to the mfg.*

*>>*

*>> I guess George thinks 12/2 = 1. But it is 6*

*>>*

*>>*

*>>*

*>> >You do however have to provide correct data at several points. If*

*>> >you, like Tweedledee and Tweedledum, are unable to do so then you*

*>> >would be better off to hire someone to do it for you as Tweedledee*

*>> >did, or, you can follow Tweedledum's solution and copy someone else's*

*>> >system design and throw money at it until it works, at least during*

*>> >daylight hours..*

*>>*

*>> George! I didn't know you hired someone to design a system for you, and*

*>> then had to throw money at until it started working!*

*>>*

*>> I knew you had to throw money at your system to get it working after your*

*>> initial setup, but I thought you had done the initial design yourself.*

*>> --ron*

*>Never resorted to either.*

Then who is this Tweedledee character that you are referring to that hired

someone to do his system design?

--ron

Posted by *bealiba* on July 30, 2008, 11:23 am

*> On Wed, 30 Jul 2008 01:08:36 -0700 (PDT), beal...@gmail.com wrote:*

*> >> On Tue, 29 Jul 2008 17:44:28 -0700 (PDT), beal...@gmail.com wrote:*

*> >> >This formula will correctly size a stand alone PV system given the*

*> >> >user input is correct. You can see every calculation. No great*

*> >> >secrets. No mysteries.*

*> >> As seen in my previous post, not only are the formulas as documented in the*

*> >> spreadsheet inaccurate, but also inaccurate are the user inputs.*

*> >> But, to repeat:*

*> >> >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 c*

*> >> >B5 Temperature correction factor =.97*

*> >> >B6 Adjusted battery capacity (B3 / B5) = 180*

*> >> >B7 Selected Battery 2AS620*

*> >> >B8 Selected battery discharge rate 1*

*> >> >B9 A-hr capacity of selected battery = 238Ah*

*> >> >B10 Number of batteries in parallel (B6 / B9, rounded off) = 4*

*> >> >B11 Number of batteries in series (A7 / battery voltage) =1*

*> >> >B12 Check Capacity of selected battery at 1 Hr rate = 238*

*> >> >B13 Capacity of battery bank at 1 hr rate (B12 x B10) = 238*

*> >> >B14 Daily depth of discharge (100 x A8 / B13) = 51.49%*

*> >> Note the calculation in B10:*

*> >> B10: B6/B9, rounded off = 4*

*> >> But B6 = 180*

*> >> B9 = 238*

*> >> I guess George thinks 180/238 = 4. But it is 0.756.*

*> >> Also note the calculation in B11*

*> >> B11: A7 / Battery voltage = 1*

*> >> A7 = 12*

*> >> voltage of 2AS620 = 2V according to the mfg.*

*> >> I guess George thinks 12/2 = 1. But it is 6*

*> >> >You do however have to provide correct data at several points. If*

*> >> >you, like Tweedledee and Tweedledum, are unable to do so then you*

*> >> >would be better off to hire someone to do it for you as Tweedledee*

*> >> >did, or, you can follow Tweedledum's solution and copy someone else's*

*> >> >system design and throw money at it until it works, at least during*

*> >> >daylight hours..*

*> >> George! I didn't know you hired someone to design a system for you, and*

*> >> then had to throw money at until it started working!*

*> >> I knew you had to throw money at your system to get it working after your*

*> >> initial setup, but I thought you had done the initial design yourself.*

*> >> --ron*

*> >Never resorted to either.*

*> Then who is this Tweedledee character that you are referring to that hired*

*> someone to do his system design?*

*> --ron*

You

>INVERTER SIZE 882.35 WATTSBzzt

>SELECTED BATTERY DISCHARGE RATE 1.00 HOURS>Ah CAPACITY OF SELECTED BATTERY 238.00 A HOURSBzzt

>CAPACITY OF BATT. BANK @ 1 HR RATE 238.00 A HOURSBzzt

>DAILY DEPTH OF DISCHARGE 51.49 %Bzzt

>It is correct.