Is the acceptable DOD constant over the battery lifetime? (Decentralized energy system)
Is the acceptable DOD constant over the battery lifetime? (Decentralized energy system)
(OP)
Hi all,
I am currently working on a project to include a battery model to a photovoltaic system design simulation tool. We have already included a capacity degradation function to account for the reducing capacity until it reaches the end of lifetime.
However we would like to know from an operator's perspective if you would keep the depth of discharge constant as the capacity sinks (thus the minimum capacity is reduced), or should you rather keep the minimum capacity constant (therefore having a lower DOD).
Thanks!
I am currently working on a project to include a battery model to a photovoltaic system design simulation tool. We have already included a capacity degradation function to account for the reducing capacity until it reaches the end of lifetime.
However we would like to know from an operator's perspective if you would keep the depth of discharge constant as the capacity sinks (thus the minimum capacity is reduced), or should you rather keep the minimum capacity constant (therefore having a lower DOD).
Thanks!
Talk To Other Members
RE: Is the acceptable DOD constant over the battery lifetime? (Decentralized energy system)
The data sheets only give a cycle life based on a fixed DOD from Day One. Technically if you slowly reduce the DOD because you're only using 40% of the battery each cycle and the capacity is slowly decaying it would likely give you the longest life. But that may not be as cost effective as getting the most out of every cycle to do whatever you're doing with the battery power.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Is the acceptable DOD constant over the battery lifetime? (Decentralized energy system)
RE: Is the acceptable DOD constant over the battery lifetime? (Decentralized energy system)
Just to confirm; we are talking about a lead-acid battery here, correct?
GG
"I have not failed. I've just found 10,000 ways that won't work." Thomas Alva Edison (1847-1931)
RE: Is the acceptable DOD constant over the battery lifetime? (Decentralized energy system)
The main focus is lead-acid batteries as the allowed DOD is lower than for Li-ion; therefore more uncertainties during planning. Would there be any extra consideration regarding this with Li-ion?