[RE-wrenches] Depth of discharge

[William Miller]

Allan:

Is it possible to discharge a battery to 80%.  What is the battery voltage 
one would expect with that DOD?

William



At 02:28 PM 3/25/2011, you wrote:
>William,
>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.
>
>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.
>Allan
>
>Allan Sindelar
><mailto:Allan at positiveenergysolar.com>Allan at positiveenergysolar.com
>NABCEP Certified Photovoltaic Installer
>NABCEP Certified Technical Sales Professional
>New Mexico EE98J Journeyman Electrician
>Positive Energy, Inc.
>3201 Calle Marie
>Santa Fe, New Mexico 87507
>505 424-1112
><http://www.positiveenergysolar.com/>www.positiveenergysolar.com
>
>
>
>
>On 3/25/2011 1:48 PM, William Miller wrote:
>>Friends:
>>
>>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%.
>>
>>Is this correct in concept?
>>
>>Is this a correct value to enter in this cell?
>>
>>Thanks,
>>
>>William Miller
>>
>>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.
>
>
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