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William,<br>
I use 80%, as the intent is that this is maximum, not typical. It's
directly used to calculate the battery capacity on the spreadsheet.
50% is more of a target occasional DoD, but it's not a maximum.<br>
<br>
In the sunny Southwest where Windy and I are planted, that's pretty
safe, as multiple days without sun happen, but not frequently. It
may be less so in Atascadero.<br>
Allan<br>
<br>
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<font face="Times New Roman, Times, serif"><b>Allan Sindelar</b></font><br>
<small><a href="mailto:Allan@positiveenergysolar.com"><font
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<span style="font-size: 10pt;">NABCEP Certified Photovoltaic
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New Mexico EE98J Journeyman Electrician<br>
<b>Positive Energy, Inc.</b><br>
3201 Calle Marie<br>
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<br>
On 3/25/2011 1:48 PM, William Miller wrote:
<blockquote
cite="mid:6.0.1.1.2.20110325124537.02e15fd8@millersolar.com"
type="cite">
<font size="3">Friends:<br>
<br>
I am using a modified version of the Dankoff load chart (with
credit
given) to calculate off-grid loads. There is a section where
you
enter the maximum depth of discharge (DOD) for a battery bank.
It
is my understanding that the maximum DOD for a lead acid battery
bank is
50%.<br>
<br>
Is this correct in concept?<br>
<br>
Is this a correct value to enter in this cell?<br>
<br>
Thanks,<br>
<br>
William Miller<br>
<br>
PS: I called Ronald Parades at Trojan before this e-mail was
sent
and here is what he said: He recommends 20%-30% DOD. Any
greater DOD results in shorter battery life. He noted that in
many
approaches a design criteria of multi-day autonomy which is
rarely or
never used actually calculates into the final AH result as a
virtual
decrease in DOD.<br>
<br>
Wm<br>
<br>
<x-sigsep></x-sigsep></font>
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Voice :805-438-5600<br>
email: <a class="moz-txt-link-abbreviated" href="mailto:william@millersolar.com">william@millersolar.com</a><br>
<a moz-do-not-send="true" href="http://millersolar.com/"
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</a>License No. C-10-773985<br>
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