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<font size=3>Allan:<br><br>
Is it possible to discharge a battery to 80%. What is the battery
voltage one would expect with that DOD?<br><br>
William<br><br>
<br><br>
At 02:28 PM 3/25/2011, you wrote:<br>
<blockquote type=cite class=cite cite>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>
</font><font face="Times New Roman, Times" size=3><b>Allan
Sindelar</b></font><br>
<font face="Times New Roman, Times" size=2 color="#000099"><u><a href="mailto:Allan@positiveenergysolar.com">Allan@positiveenergysolar.com</a></u></font><font face="Times New Roman, Times" size=3><br>
NABCEP Certified Photovoltaic Installer<br>
NABCEP Certified Technical Sales Professional<br>
New Mexico EE98J Journeyman Electrician<br>
<b>Positive Energy, Inc.</b><br>
3201 Calle Marie<br>
Santa Fe, New Mexico 87507<br>
<b>505 424-1112</b><br>
<u><a href="http://www.positiveenergysolar.com/">www.positiveenergysolar.com</a></u></font>
<br><br>
<b><br>
</b><br><br>
On 3/25/2011 1:48 PM, William Miller wrote: <br>
<blockquote type=cite class=cite cite>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>
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