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:al...@positiveenergysolar.com>al...@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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