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
[email protected]
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
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.
Wm
Miller Solar
Voice :805-438-5600
email: [email protected]
http://millersolar.com
License No. C-10-773985
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